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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?