bacte lec - Gram-negative Enteric Bacilli

Gram-negative, facultative anaerobe, non-lactose fermenter

Which of the following characteristics is TRUE about Salmonella?

Salmonella typhi

Which Salmonella species is carried only by humans?

Bile

Salmonella typhi can tolerate large concentrations of what substance?

Vi antigen

Which antigen in Salmonella typhi is responsible for its capsule?

Typhoid fever

What disease is caused by Salmonella typhi?

Mouth

What is the portal of entry for Salmonella typhi?

100,000 bacteria

What is the infecting dose for Salmonella typhi?

GallbladderTyphoid fever carriers are individuals who:

What major organ does Salmonella typhi infect before being excreted in stool?

Have no symptoms but continue to excrete bacilli

Typhoid fever carriers are individuals who:

Salmonella typhi

Typhoid Mary was a famous carrier of:

Widal test

What test detects agglutinating antibodies against Salmonella typhi antigens?

Blood

Which specimen is best for detecting Salmonella typhi during the first week of infection?

Alkaline slant, acid butt, no gas, small H2S

In Triple Sugar Iron (TSI) agar, Salmonella typhi produces:

Bacillary dysentery (Shigellosis)

What is the primary disease caused by Shigella?

Shigella dysenteriae

Which Shigella species is the most pathogenic?

Food, Flies, Feces, Fingers

Shigella is transmitted through the 4 F’s, which include:

Shiga toxin

Which virulence factor in Shigella disrupts protein synthesis?

Enterotoxigenic E. coli (ETEC)

Which type of Escherichia coli is responsible for traveler’s diarrhea?

EHEC (O157:H7)

Which Escherichia coli strain is associated with hemorrhagic colitis and hemolytic uremic syndrome?

Eosin Methylene Blue (EMB)

What is the best culture medium for isolating Escherichia coli?

Endotoxin

Salmonella typhi produces which of the following virulence factors?

Reticuloendothelial system

Salmonella is capable of surviving in macrophages and spreading through the body via which system?

It aids in species identification

What is the role of the H antigen in Salmonella?

Contaminated dairy products and poultry

Salmonella gastroenteritis is most commonly acquired from:

Rose spots on the skin

What is a key symptom of typhoid fever during the second week of infection?

Shigella sonnei

Which Shigella species is the most common cause of shigellosis in the United States?

Non-motile

Shigella differs from Salmonella because it is:

100-200 bacteria

What is the infectious dose of Shigella needed to cause disease?

Bloody diarrhea with mucus and pus

What symptom is characteristic of shigellosis?

Enteropathogenic E. coli (EPEC)

Which of the following Escherichia coli strains is associated with infantile diarrhea?