USMLE Microbiology Systems High
Yield
Food poisoning from reheated meat - answerC perfringens
Food poisoning from poultry, meat, eggs - answerSalmonella
Food poisoning from contaminated seafood - answerV parahaemolyticus and V
vulnificus (can also cause wound infections)
Bug causing bloody diarrhea w/ liver abscesses - answerEntamoeba histolytica
Lactose (-) bugs causing bloody diarrhea - answerSalmonella (non-typhi) & shigella
Bug causing bloody diarrhea associated with day care outbreaks - answerY
enterocolitica (pseudoappendicitis)
Protozoa causing watery diarrhea - answerGiardia, cryptosporidium
Toxin producing water diarrhea found in cholera and ETEC - answerST toxin - Gs
Viruses causing watery diarrhea - answerRota, noro (#1), enteric adenovirus
Top causes of PNA in neonates - answerGBS and E coli
Top causes of PNA in children 4wk-18yo - answerRSV, mycoplasma, C trachomatis
(infants to 3yo), C pneumoniae (school aged), S pneumoniae
Top causes of PNA in adults 18-40yo - answerMycoplasma, C pneumoniae, S
pneumoniae, influenza
Top causes of PNA in adults 40-65yo - answerS pneumo - H influenza, anaerobes,
viruses, mycoplasma
Top causes of PNA in the elderly - answerS pneumonia, influenza, anaerobes, H
influenza, G(-)
Yield
Food poisoning from reheated meat - answerC perfringens
Food poisoning from poultry, meat, eggs - answerSalmonella
Food poisoning from contaminated seafood - answerV parahaemolyticus and V
vulnificus (can also cause wound infections)
Bug causing bloody diarrhea w/ liver abscesses - answerEntamoeba histolytica
Lactose (-) bugs causing bloody diarrhea - answerSalmonella (non-typhi) & shigella
Bug causing bloody diarrhea associated with day care outbreaks - answerY
enterocolitica (pseudoappendicitis)
Protozoa causing watery diarrhea - answerGiardia, cryptosporidium
Toxin producing water diarrhea found in cholera and ETEC - answerST toxin - Gs
Viruses causing watery diarrhea - answerRota, noro (#1), enteric adenovirus
Top causes of PNA in neonates - answerGBS and E coli
Top causes of PNA in children 4wk-18yo - answerRSV, mycoplasma, C trachomatis
(infants to 3yo), C pneumoniae (school aged), S pneumoniae
Top causes of PNA in adults 18-40yo - answerMycoplasma, C pneumoniae, S
pneumoniae, influenza
Top causes of PNA in adults 40-65yo - answerS pneumo - H influenza, anaerobes,
viruses, mycoplasma
Top causes of PNA in the elderly - answerS pneumonia, influenza, anaerobes, H
influenza, G(-)
