Facuktatively anaerobic gram-negative rods

Question 1

Family Enerobacteriacae

Answer 1

live in the intestines of humans and other animals

Question 2

Genus Enterobacter

Answer 2

E. aerogenes

Question 3

Genus escherichia

Answer 3

E. coli, the prokaryotic ‘guinea pig’. very well characterized used in pioneering studies of genetics, some strains cause traveler’s diarrhea, and strain O157:H7 is pathogenic (hemolytic uremic syndrome, has killed esp. children).

Question 4

Genus Klebsiella

Answer 4

K. pneumoniae, cause of pneumonia in elderly and immunocompromised

Question 5

Genus Proteus

Answer 5

P. vulgaris, highly motile

Question 6

Genus Salmonella*

Answer 6

S.typhi, cause if typhoid fever, a big killer before good sanitation practices (ex. municipal treatment of sewage and drinking water). Some people are asymptomatic carriers of S. typhi

Question 7

Salmonella enteritidis

Answer 7

cause of salmonellosis a.k.a food poising,

Question 8

Genus Shigella*

Answer 8

Shigella resembles E.coli except it almost invariably produces a variety of enterotoxins

Question 9

Genus Yersinia*

Answer 9

Y. pestis, vectored into human bites of infected fleas causes plague (lymphatic infection) has an untreated mortality rate of 50-75%, pneumonic plague nearly always kills. Y. pestis was probable cause of the 1347-1350 “black death”, an epidemic that killed about one-third of the population of Europe.