Question 1
pts
After sexual transmission of HIV, a person can be infected yet seronegative for _____ months.
1 to 2
Correct!
6 to 14
24 to 36
18 to 20
Antibody appears rather rapidly after infection through blood products, usually within 4
to 7 weeks. After sexual transmission, however, the individual can be infected yet
seronegative for 6 to 14 months or, in at least one case, for years.
Question 2
pts
Once they have penetrated the first line of defense, which microorganisms do neutrophils actively attack,
engulf, and destroy by phagocytosis?
Correct!
Bacteria
Viruses
Mycoplasma
Fungi
Invasion results in direct confrontation with an individual’s primary defense mechanisms
against bacteria, which include the complement system, antibodies, and phagocytes,
such as neutrophils and macrophages. (See Chapters 6, 7, and 8).
Question 3
pts
Which statement about vaccines is true?
, Correct!
Vaccines require booster injections to maintain lifelong protection.
Vaccines provide effective protection for all people against viruses, bacteria, and fungal infections.
Most bacterial vaccines contain attenuated organisms.
Most viral vaccines are made by using dead organisms.
In general, vaccine-induced protection does not persist as long as infection-induced
immunity, thus booster injections may be necessary to maintain protection throughout
life.
Question 4
pts
Cells in _____ may act as a reservoir in which HIV can be relatively protected from antiviral drugs.
the thymus gland
Correct!
the central nervous system
the lungs
bone marrow
HIV may persist in regions where the antiviral drugs are not as effective, such as the
CNS.
Question 5
pts
Which statement is true about fungal infections?
They result in release of endotoxins.
Correct!
They are controlled by phagocytes and T lymphocytes.
They are prevented by vaccines.