WGU D311 MICROBIOLOGY OBJECTIVE ASSESSMENT ACTUAL EXAM VERIFIED QUESTIONS WITH CORRECT DETAILED ANSWERS AND RATIONALES || 100% GUARANTEED PASS RECENT VERSION

A physician who has been treating a patient with cephalexin for a skin infection secondary to uncontrolled diabetes mellitus notes that the infection has worsened over the past 10 days. The physician orders culture and susceptibility testing. Which pathogen does this physician suspect? - Answer️Methicillin-resistant Staphylococcus aureus A physician selects the antibiotic azithromycin for an adult patient with bacterial pneumonia, based on knowledge of the bacteria that commonly cause pneumonia. Which public health factor should the physician consider when selecting the antibiotic for this patient? - Answer️A review of practice medical records for similarly affected patients reveals that azithromycin has been 90% successful for the treatment of pneumonia. A litter of kittens arrives at an animal shelter, and the kittens have various multifocal, raised, minimally haired skin lesions. The attending veterinarian believes these lesions are suggestive of ringworm. What can the veterinarian do to prevent an outbreak of ringworm among cats in the shelter? - Answer️Isolate the kittens from other animals because dogs and cats are susceptible to ringworm Approximately 40% of people receive the inactivated form of the influenza virus vaccine annually. What does this fact imply regarding public health? - Answer️The value of influenza virus vaccination for everyone could be better communicated to the public. The label for one of the influenza virus vaccines states that the vaccine is "indicated for active immunization for the prevention of disease caused by influenza A subtype viruses and type B viruses contained in the vaccine" (U.S. Food and Drug Administration). Which impact can this have on public health? - Answer️The vaccine will protect vaccinated people from an influenza virus that undergoes antigenic drift. Smallpox is a highly contagious, fatal disease that has been eradicated since 1980. The smallpox vaccine contains a poxvirus similar to the virus that causes smallpox. Why does the vaccine contain a virus similar to the one that causes smallpox rather than one that contains the actual virus that causes smallpox? - Answer️The similar poxvirus does not cause a smallpox infection, whereas the actual virus does. Which statement describes prokaryotic cells? - Answer️Prokaryotic cells are found in coccus form in both pairs and clusters. Which statement describes eukaryotic cells? - Answer️The nuclei of eukaryotic cells are surrounded by complex nuclear membranes. Which statement describes eukaryotic flagella? - Answer️Eukaryotic flagella are flexible, whip-like structures. Which statement describes the endomembrane system? - Answer️It includes the Golgi apparatus, lysosomes, and vesicles. Which statement accurately describes similarities between protozoa and fungi? - Answer️Both can be harmful or harmless depending on the context. Why are algae considered photosynthetic organisms? - Answer️Algae produce chemical energy from the sun's light energy. Why are plasmids important to the survival of organisms? - Answer️Plasmids carry genetic material, apart from the genome, that can benefit the organism Which statement describes bacteria? - Answer️Some bacteria have cell walls composed of mycolic acid. Which aspect of nutrient cycling is performed only by prokaryotes? - Answer️Nitrogen fixation Which microbial process is useful in the production of alcoholic beverages? - Answer️Glucose fermentation How does microbial bioremediation benefit the environment? - Answer️By helping to metabolize and remove pollutants in the atmosphere How is penicillin classified? - Answer️As a natural antibiotic What describes the relationship of pathogens to virulence? - Answer️Highly virulent pathogens almost always lead to a disease state when introduced to the body. What is the key difference between a primary pathogen and an opportunistic pathogen? - Answer️Primary pathogens can infect anyone, whereas opportunistic pathogens can cause disease if the host is immunocompromised. How can disease expression be described? - Answer️Signs and symptoms associated with illness can be a result of many things, including an immune response. What is the correct understanding of the median infectious dose? - Answer️It is the number of pathogenic cells required to cause active infection in 50% of inoculated animals. correct Which structure aids in the evasion of phagocytosis by preventing immune cells from adhering to pathogens? - Answer️Capsule Which group contains a pathogen that adheres to host cells by using a large adhesive disc? - Answer️Protozoans Which phenomenon is found only in viruses? - Answer️Antigenic shift Which structure is used by certain bacteria to adhere to host tissues? - Answer️Type 1 fimbrial adhesin Which virulence factor aids in the adherence of bacterial pathogens to a host? - Answer️Pili Which situation is an indirect result of endotoxin release? - Answer️Inflammation and fever are initiated. Which characteristic is true of endotoxins? - Answer️Endotoxins cause fevers. Which characteristic is true of exotoxins? - Answer️Exotoxins can cause cytokine storms. Which statement describes biofilms? - Answer️Biofilms are highly structured communities. Which step in biofilm formation comes immediately after planktonic cells attach to a surface? - Answer️Planktonic cells become sessile. Which biofilms are produced by mutualistic microbes and are beneficial to a human host? - Answer️Biofilms that line the intestinal mucosa Why would bacteria living in a biofilm slow down their metabolism? - Answer️To survive the low-nutrient environment deep in the biofilm structure Which type of microscopy allows the visualization of internal cellular structures in specially fixed microbial specimens? - Answer️Electron microscopy What does a phase-contrast microscope use to visualize a specimen? - Answer️Light Which type of microscopy produces highly detailed three-dimensional images of a specimen? - Answer️Scanning electron microscopy Which method of microscopy uses a laser to scan multiple planes and produces a three-dimensional image that can be used to visualize the internal structure of a biofilm? - Answer️Confocal microscopy Which technique uses a single dye to emphasize particular structures in the specimen? - Answer️Simple staining Which bacterial structure determines the different outcomes of the Gram stain? - Answer️Peptidoglycan Which pathogenic bacteria can be determined using acid-fast staining? - Answer️Mycobacterium tuberculosis Which staining technique is used to identify Mycobacteria because of the wax-like composition of their cell wall? - Answer️Acid-fast stain A hemagglutination assay is applied to dilutions of a sputum sample from a person with signs of an upper respiratory infection. When the scientists evaluated the sputum samples, they did not observe hemagglutination. Which microbial cause of upper respiratory infections has been ruled out? - Answer️Influenza virus The antibiotic doxycycline works by inhibiting protein synthesis through binding to the 30S ribosomal subunit. Why would this antibiotic be ineffective against viruses? - Answer️Viruses do not have ribosomes. A patient who is immunosuppressed develops skin pustules and itching. What is a plausible cause of these symptoms? - Answer️An opportunistic bacterial infection A culture of fluid collected from a healthy person via a bronchoalveolar lavage yielded growth of Staphylococcus aureus; however, a culture of a similarly collected sample from a person sneezing and coughing also yielded growth of Staphylococcus aureus. How can the same bacteria cause infection and symptoms in one person but not in another person? - Answer️Commensal bacteria became opportunistic. Why can both cats and people be infected with herpesvirus but not infect each other? - Answer️These viruses are species-specific. Fimbria is a virulence factor of Escherichia coli necessary for an infection to develop. Which treatment may be helpful to prevent urinary tract infections caused by Escherichia coli on the basis of the bacteria's virulence factor? - Answer️Cranberry extract because it interferes with the adherence of Escherichia coli to the bladder wall A patient presents to an emergency department with severe dehydration, diarrhea, and abdominal cramps because of the release of exotoxin. Which pathogen is a plausible cause of this patient's symptoms? - Answer️Escherichia coli After a Gram staining of material collected from a skin abscess reveals gram-positive bacteria, a physician considers nontuberculous mycobacteriosis as a differential diagnosis. Which stain should be applied next to further characterize these gram-positive bacteria? - Answer️Acid-fast stain A laboratory technologist sees a series of spherical structures on a slide of swabbed material from a dog's ear canal via a microscope with its objective set at 100x. Which type of microorganism is this technologist seeing? - Answer️Bacterium Gram staining of a urine sample unexpectedly reveals both gram-positive cocci and gram-negative rods; however, only gram-negative rods are seen in white blood cells (intracellular). How should these findings be interpreted? - Answer️The gram-negative bacteria from the sample are pathogenic. Which class of cells most often contain extrachromosomal DNA found in plasmids? - Answer️Prokaryotic What is the significance of the molecule that makes up the bilayer formed in the plasma membrane of most bacterial and eukaryotic cells? - Answer️Phospholipids help maintain hydrophobic and hydrophilic environments. Which microorganisms produce dermatophytes that can cause skin infections, such as athlete's foot and ringworm? - Answer️Fungi Which microorganisms can produce human pathogens that spread via microsporidia? - Answer️Fungi Why are archaea considered prokaryotic organisms? - Answer️Their cells do not contain a nucleus. Why is MRSA more pathogenic than other strains of Staphylococcus aureus? - Answer️MRSA has increased antibiotic resistance. A patient recently had an outpatient surgical procedure. After a few days at home, they notice swelling and redness at their incision site. How would this infection be classified? - Answer️Iatrogenic Which viral virulence factor requires adjustments to the influenza vaccine annually? - Answer️Antigenic variation Which pair of enzymes are produced by some bacteria that cause the clotting of blood to protect the bacteria in the bloodstream, then a digestion of the clots to allow the bacteria to spread? - Answer️Coagulase and kinase How does coinfection of a single cell by multiple strains of a virus increase its pathogenicity? - Answer️Coinfection provides the opportunity for an antigenic shift. Canned food is heated and sealed in sterile containers to provide a longer shelf life and prevent spoilage. Improper canning results in the growth of microorganisms, which may result in food containers that swell and explode. Which staining technique can be used to identify these microorganisms? - Answer️Endospore staining A student in a lab has just completed an endospore stain of Bacillus anthracis and realized that heat was not applied during the staining technique. What will the student see upon microscopic examination of the slide? - Answer️Pink vegetative cells with clear round areas A physician is given a vaginal swab in order to test for post-antibiotic vaginal infection. Which microscopic technique would identify the opportunistic fungal pathogen? - Answer️Wet mount stain A technician has just performed a Gram stain but forgot to add the safranin. What is the likely result of this stain when viewed microscopically? - Answer️Gram-negative organisms cannot be seen under the microscope. Which characteristic of mycobacterium makes a Gram stain unsuitable? - Answer️The cell wall has a waxy lipid. Which feature of infection indicates the presence of a primary pathogen rather than an opportunistic pathogen? - Answer️Patients with healthy immune systems After oral antibiotic therapy, a patient is diagnosed with vaginitis. What type of microbe could be causing this opportunistic infection? - Answer️Fungus What type of microbe is used to deliver gene therapies to human cells? - Answer️Virus What type of diseases are found in higher numbers than expected in local populations? - Answer️Epidemic Which describes a mutualistic relationship? - Answer️Ruminococcus species using nutrients from a cow's diet to digest plant cellulose in the rumen. Why are photosynthetic bacteria and algae important to the carbon cycle on Earth? - Answer️Photosynthetic microbes metabolize carbon dioxide, fix carbon, and produce oxygen. What microbial process is used by bacteria and fungi to produce many common food products, such as soy sauce, bread, and yogurt? - Answer️Fermentation Which beneficial role do viruses have in the environment? - Answer️Integrating into plant genomes to increase drought tolerance A dental hygienist nicked the gum of the patient during a routine cleaning. A mild infection of the gum was followed 10 days later with acute bacterial endocarditis. Which type of infection caused the endocarditis? - Answer️A focal infection An infected individual riding in a subway car coughs for a few minutes, then leaves. An individual standing at the opposite end of the car one hour after the infected individual left develops symptoms two days later. How was this pathogen transmitted? - Answer️The pathogen exhibits airborne transmission, where suspended mucus particles travel long distances over time to cause infection. What is the most common portal of exit for vector-transmitted diseases such as West Nile virus? - Answer️Blood Which type of transmission describes a parent catching the common cold virus when caring for their sick child? - Answer️Direct contact transmission Which organism is implicated if type 1 fimbriae are used to attach to intestinal epithelial cells? - Answer️Escherichia coli A patient presents with an infection on an implant. What should the clinician consider in planning the treatment course? - Answer️The infection is likely a biofilm, causing a physical barrier to antibiotics. Which outcome is a direct result of the increased "leakiness" of capillaries during inflammation? - Answer️Edema To reach pathogens located in infected tissue, leukocytes must pass through the walls of small capillary blood vessels within tissues. What is this process called? - Answer️Extravasation How is incidence different than prevalence? - Answer️Incidence is the total number of cases at a given point in time, whereas prevalence is the number of new cases over a given span of time. A novel disease is epidemic in three countries.What should the World Health Organization do first to manage the spread? - Answer️Determine the etiologic agent What role does contact tracing play in disease prevention? - Answer️Ensures that exposed individuals receive appropriate treatment and testing or isolate themselves. The day after attending a birthday party for a niece, a person starts to develop fever, nausea, and vomiting. Within a day, nearly everyone who was in attendance has contacted this person, complaining that they are also sick. Family members who did not attend the party do not have these signs and symptoms.What is a likely explanation for how this disease spread? - Answer️Point source spread from a single contaminated food at the party A bacterial pathogen is found growing in the bloodstream of a patient. Which diagnosis is correct for this finding? - Answer️Septicemia Which method of physical microbial control can be used to sterilize fresh food? - Answer️Desiccation Which statement regarding antiseptics is true? - Answer️Antiseptics kill microbes on skin or tissue via antimicrobial chemicals. Why do aseptic techniques prevent contamination of a patient by microbes and infectious agents? - Answer️Aseptic techniques maintain the sterility of an object or place through the use of physical and chemical protocols. Which type of microbial control is used to remove most microbes from the kitchen counter in a restaurant? - Answer️Disinfection How does filtration, such as that found in surgical masks, N95 respirators, and high-efficiency particulate air (HEPA) filters, prevent microbial transmission? - Answer️Filters have pores that trap particles above a certain size, including most microbes. Why is desiccation or dehydration an effective method of microbial control? - Answer️Water concentration decreases below what is required for microbial survival. When would it be best to treat a patient with a narrow-spectrum antimicrobial rather than a broad-spectrum antimicrobial? - Answer️When the infectious agent has been identified as a gram-negative bacterium When can narrow-spectrum antibiotics be used to treat infectious diseases effectively? - Answer️When the infection is known to be caused by a gram-positive bacterium Why is ergosterol targeted by antifungals? - Answer️Ergosterol synthesis allows for selective toxicity that is not possible with cholesterol. Why are diseases like Legionnaires' disease considered noncommunicable? - Answer️Once a person contracts this disease, they can not pass it to another person. Which target would appropriately treat a fungal skin infection? - Answer️Ergosterol synthesis Broad-spectrum antibiotics disrupt the microbiome and provide an opportunity for pathogens such as Clostridium difficile to grow and cause infection. How can the microbiome be quickly reestablished to prevent a Clostridium difficile infection? - Answer️Fecal transplant A person who is allergic to components of a vaccine is still protected from contracting a virus due to the vast majority of the surrounding population being vaccinated and unable to contract a pathogen. What is this phenomenon called? - Answer️Herd immunity Why is there a resurgence in whooping cough and measles in the United States? - Answer️More opposition to childhood vaccination Which vaccine type has the advantages of producing long-lasting cellular and humoral immunity and allowing transmission to contacts? - Answer️Live attenuated Which organism type does a conjugate vaccine target? - Answer️Capsule-forming A pregnant person has received all of her childhood immunizations, including for pertussis, but has chosen not to receive boosters while pregnant or to immunize her child once it is born. What will happen to her child if exposed to pertussis at five years old? - Answer️The child's immune system will need to fight the infection. An infection by a pathogen that occurs several years after the first elicits a faster response from lymphocytes. Why is the response by lymphocytes to a second infection so much faster than the first? - Answer️Lymphocytes produce memory cells during the first infection, providing active immunity. What is a characteristic of rhizospheres? - Answer️The rhizosphere is where plants release organic compounds that can be metabolized by microbes into soil. Which environment would contain microbes that are psychrophilic? - Answer️Glaciers What is the role of nematodes in soil? - Answer️They photosynthesize and fix nitrogen. Which eukaryote is responsible for producing antibiotics to ward off bacterial competitors? - Answer️Fungi Which symbiotic relationship is an example of mutualism? - Answer️The relationship between humans and the Escherichia coli colonizing the human gut Which type of symbiotic relationship exists between the Escherichia coli (E. coli) that inhabit the human gut and the humans who utilize the vitamin K produced by E. coli? - Answer️Mutualism Which description of resident microbiota is true? - Answer️Resident microbiota constantly live on the human body. Which relationship is exhibited by intestinal Escherichia coli and their human host? - Answer️Mutualism Which type of disease is transmitted from animals to humans? - Answer️Zoonotic diseases Which type of disease is acquired in hospital settings? - Answer️Nosocomial diseases Which portal of exit can expel the most viral particles? - Answer️Respiratory Which type of disease is sickle cell anemia? - Answer️Noninfectious Which type of transmission occurs when tuberculosis is spread through small particles expelled by a cough? - Answer️Droplet transmission Which type of transmission occurs when pathogens are spread from mother to child during breastfeeding? - Answer️Vertical direct contact transmission Which type of transmission occurs when an arthropod carries a viral pathogen inside of its body? - Answer️Biological vector transmission Which type of transmission occurs through contact with a fomite? - Answer️Indirect contact transmission Which infected host would be considered a passive carrier? - Answer️A healthcare professional who does not wash their hands after seeing an infected patient How is Giardia lamblia, the causative agent of giardiasis, transmitted? - Answer️Contaminated food or water Which organism is the definitive host of Toxoplasma gondii? - Answer️Birds Which disease is transmitted by animals but not arthropods? - Answer️Rabies How can adhesins be described? - Answer️Adhesins found on the surface of pathogens bind to receptors of host cells. Which description indicates a portal of entry? - Answer️Body features through which pathogens can enter host tissue Pathogens produce proteins to prevent the fusion of the phagosome and the lysosome (phagolysosome).Why does this virulence factor facilitate invasion? - Answer️It prevents the exposure of pathogens to lethal digestive enzymes. Which action refers to a secondary infection? - Answer️An infection by one pathogen enables another pathogen to cause an infection. What differentiates signs from symptoms of disease? - Answer️Signs are measurable; symptoms are subjective. Which procedure does a clinician use to measure a symptom? - Answer️Asking patients to rate pain on a numerical scale During which stage of an infection does a patient feel the worst? - Answer️The period of illness stage What defines the end of the incubation period for an infectious disease? - Answer️The appearance of nonspecific signs or symptoms of disease How does the epidermis help prevent infection and disease? - Answer️It provides a harsh environment for most pathogens and periodically sheds How does the complement system contribute to the innate immune response? - Answer️It is composed of proteins that can be activated by the presence of pathogens to form the membrane attack complex (MAC). Why are antimicrobial peptides (AMPs) considered an innate immune function? - Answer️AMPs are produced both routinely and as a response to pathogens. Which terms refer to monocytes when they differentiate into tissue-specific phagocytes? - Answer️Macrophages and dendritic cells What is specifically being reported if the Centers for Disease Control and Prevention reports 10,000 new cases of COVID-19? - Answer️Incidence What is the difference between prevalence and incidence? - Answer️Prevalence refers to the total number of infections; incidence refers only to new cases. Which term refers to a disease that occurs on a worldwide scale at a given time? - Answer️Pandemic Why are etiologic agents significant to epidemiologists? - Answer️Etiologic agents are the pathogens that cause disease. Which kind of diseases must be reported to the Centers for Disease Control and Prevention in order to prevent future pandemics? - Answer️Notifiable diseases How does the Centers for Disease Control and Prevention (CDC) obtain the latest data on typical illnesses to publish in the Morbidity and Mortality Weekly Report (MMWR)? - Answer️Through mandatory reporting of notifiable disease cases by healthcare providers What can cause an infectious disease to become a reemerging disease? - Answer️The responsible pathogen becomes drug resistant. What does the World Health Organization (WHO) do to prevent future pandemics? - Answer️The WHO maintains a global alert and response system from data from multiple countries. A patient taking the antibiotic cephalexin for a urinary tract infection developed severe diarrhea two days after completing the five-day course of treatment. What is an explanation for the development of this patient's diarrhea? - Answer️Cephalexin disrupted the normal intestinal microbiome. Store-bought, packaged soil used to promote rapid plant growth was accidentally irradiated, thus killing the bacteria that had been in the soil. Which impact would this have on farmers? - Answer️Plants would die due to a lack of absorbable forms of nitrogen and phosphorus. A hospital infection preventionist has instituted a policy to prevent nosocomial infections. Which guideline is an effective component of this policy? - Answer️Healthcare personnel must wear personal protective equipment at all times. A family and its dog were hiking and swimming in the woods. Two days later, each family member developed a large bull's-eye lesion on their arm, and the dog became anorexic and lethargic. Which control measure will be helpful to prevent the development of a future infection caused by the same microorganism? - Answer️The family immediately checks themselves and the dog for ticks after returning home. A veterinarian diagnoses a dog with a zoonotic bacterial infection. Which precautions should the veterinarian advise for the caretaker? - Answer️Wash hands after touching the dog Viral epidemics concern public health department officials because some infected people do not show signs or symptoms of infection, whereas others have prolonged prodromal periods. What should public health officials do to minimize these causes for concern? - Answer️Test people who are asymptomatic A contagious respiratory feline virus may reactivate a latent infection months to years after an initial infection. Which implication does this have for the management of cats in animal shelters? - Answer️Cats entering the shelter should be isolated from other sheltered cats. Two spouses present to the emergency department because of difficulty swallowing, facial weakness on both sides of the face, and trouble breathing after consumption of spaghetti sauce made from canned tomatoes. The physician is aware of reports of similarly affected patients in nearby communities. What should be the physician's next step after treating these patients? - Answer️Contact the state department of public health The varicella-zoster virus (chicken pox) is endemic in the United States. What should physicians do to optimally minimize the risk of disease due to this virus? - Answer️Vaccinate those who have not already had chicken pox Miami-Dade County public health officials confirmed transmission of Zika virus by the local Aedes aegypti mosquito, but the virus had been previously transmitted by mosquitoes only in Latin America and South America, where the virus is endemic. What can be done to mitigate the spread of the Zika virus so that it does not become endemic in the United States? - Answer️Remove outdoor objects that may accumulate water because they serve as mosquito reservoirs Which factor determines the level of bioburden (microbial level) allowed and, therefore, the microbial controls required for items used in a general healthcare setting? - Answer️The application or use of the item Which laboratory biosafety level would be used for managing work with an organism of moderate risk that is native to the local area? - Answer️BSL-2 Which microbial control type can be used to completely eliminate all vegetative bacteria, endospores, fungi, and viruses from an inanimate item? - Answer️Sterilization Which term describes the area specially created and maintained for performing medical procedures that carry risk from contamination? - Answer️Sterile field Which physical method of control works by removing microorganisms from a liquid? - Answer️Filtration Which physical method of control is used to denature proteins and alter membranes of microorganisms to prevent spoilage of milk, apple juice, honey, and other ingestible items to reduce microorganism levels? - Answer️Pasteurization Which technique will ensure that Clostridium botulinum and botulinum toxin cannot cause foodborne illness? - Answer️Boiling foods for at least 10 minutes prior to eating Which method would be used to sterilize an antibiotic solution? - Answer️Membrane filtration Which chemical treatment would be used before a disinfectant to reach a soiled surface? - Answer️A surfactant Which class of chemical disinfectant denatures proteins and disrupts membranes? - Answer️Phenolics Which chemical is commonly used for hand sanitizers and to degerm a site prior to injections due to its effective destruction of vegetative bacteria by denaturing proteins and its quick-drying properties? - Answer️Alcohols Which chemical is effective at killing bacterial endospores with sufficient time and concentration? - Answer️Peroxygens Which factor is of particular importance when administering an antibacterial drug to an immunocompromised patient due to the patient's inability to clear infections? - Answer️Bactericidal antimicrobial Which antibacterial drug works by inhibiting nucleic acid synthesis? - Answer️Fluoroquinolones What is showcased when two antibiotics provide bacteriostatic inhibition when taken separately but bactericidal inhibition when combined? - Answer️Synergism Which drug class inhibits cell wall biosynthesis? - Answer️Penicillins Which antimicrobial agent is effective against a cold sore caused by a herpes infection? - Answer️Antivirals Which organism would be affected by an antimicrobial agent that disrupts peptidoglycan synthesis? - Answer️Bacteria Which cellular function would be disrupted by an antimicrobial that targets peptidoglycan synthesis? - Answer️Cell wall synthesis Which structure is damaged by an antifungal that targets ergosterol synthesis? - Answer️The cell membrane Which molecule is responsible for presenting viral antigen to cytotoxic T cells? - Answer️Major histocompatibility complex I (MHC I) correct Which statement correctly describes humoral immunity? - Answer️Humoral immunity is mediated by B cell-produced antibodies. What is the difference between antigens (Ags) and pathogen-associated molecular patterns (PAMPs)? - Answer️PAMPs are found on numerous pathogens; Ags are unique to specific pathogens. Which complete region of an antibody is the site of complement factor binding? - Answer️Fragment crystallization (Fc) region How do vaccines provide immunity to disease? - Answer️Vaccines stimulate both humoral and cell-mediated immune responses. Which vaccine type provides immunity by introducing the body to a less virulent pathogen? - Answer️Attenuated vaccines Which characteristic is a disadvantage of attenuated vaccines? - Answer️Attenuated vaccines result in the development of the signs and symptoms of disease. Which vaccine type was formulated to combat capsule-producing pathogens? - Answer️Conjugate vaccines Which type of immunity is generated from vaccination? - Answer️Artificially active acquired immunity What is the effect of herd immunity on a population? - Answer️The protection of susceptible individuals in a population from a disease What is the global financial impact of vaccinating for measles? - Answer️The cost of vaccination is less than the overall cost of medical care and lost work time due to measles infection, so money is saved by vaccinating the public. Which vaccine was the first to provide immunity, paving the way for the subsequent vaccination campaigns? - Answer️Smallpox A patient developed peritonitis (infection of the abdominal cavity) after intestinal surgery. The attending physician suspects a nosocomial infection as the cause. - Answer️Adhere to surgical suite cleaning and disinfection protocols An outbreak of canine infectious respiratory disease (CIRD) occurred in a dog boarding facility after a dog that was asymptomatic later developed the disease. Which strategy will mitigate the risk of a future outbreak of CIRD? - Answer️Require dogs to be vaccinated for CIRD pathogens The Environmental Protection Agency (EPA) guidelines on disinfection state a specific number of bacteria must be reduced in less than 10 minutes for a company to claim that its chemical solution is a disinfectant. How can a 1:10 dilution of bleach solution be used for disinfection if only undiluted bleach meets the EPA's guidelines? - Answer️Allow diluted bleach to contact clean, contaminated surfaces for more than 10 minutes A foodborne pathogen is suspected as a cause of acute onset fever and diarrhea in people after eating one brand of a packaged salad mix. Which method will mitigate the future risk of product contamination with this pathogen? - Answer️Farmers use water sourced only from a city's water supply for field irrigation