Gastroenteritis


1. With regards to the management of gastroenteritis, which of the following is FALSE?

Diarrhoea caused by C.difficile may be treated by stopping unnecessary antibiotics and giving metronidazole
Management is usually symptomatic, e.g. rehydration
Metronizadole should not be used to treat dairrhoea associated with giardia or amoebiasis+ Antidiarrhoeals can precipitate toxic megacolon in severe invasive disease
Antibiotics are usually unnecessary
2. Which of the following post-infective complications of gastroenteritis is seen especially after salmonella infection, but also seen in sarcoidosis, primary TB, post-streptococcal infection, sulphonamide use, infective and inflammatory bowel diseases?

lactose intolerance
post-infective irritable bowel syndrome
Erythema nodosum
reactive arthritis
erythema nodosum
3. What is the incubation period for staph aureus (pre-formed toxin)?

1-6 hours
16-24 hours
12-48 hours
8-16 hours
48-96 hours
4. Which of the following post-infective complications of gastroenteritis is more commonly seen in individuals who are HLA B-27 positive

post-infective irritable bowel syndrome
reactive arthritis
lactose intolerance
erythema nodosum
Erythema nodosum
5. Which of the following shows the CORRECT incubation period

Staph aureus (preformed toxin): 12-48 hours
salmonella (infection-related): 8-16 hours
B cereus(preformed toxin): 8-16 hours
campylobacter (infection-related): 48-96 hours
B cereus (infection-related): 1-6 hours
6. With regards to Haemolytic uraemic syndrome, which of the following is false?

Blood passed in the stool of any child with diarrhoea should raise suspicion of this
Blood clotting times are usually deranged
It is the triad of acute renal failure, microangiopathic haemolytic anaemia, and thrombocytopenia
The thrombocytopenia is thought to be a consequence of platelet consumption at sites of endothelial injury
Most commonly occurs following diarrhoeal illness
7. Which of the following complications of gastroenterities is most often associated with E. Coli 0157 but also seen occasionally with shigella and salmonella?

renal failure
septicaemia
toxic megacolon
amoebic liver abscess
haemolytic-uraemic syndrome
8. Which of the following complications of gastroenterities is most commonly due to salmonella?

toxic megacolon
renal failure
amoebic liver abscess
septicaemia
haemolytic-uraemic syndrome
9. Which of the following is NOT a bacterial cause of gastroenteritis?

Clostridium perfringens
Cryptosporidium
Bacillus cereus
Yersinia
Shigella
10. Which of the following complications of gastroenteritis is rare, but when it does occur is usually in invasive dysenteric illness?

haemolytic-uraemic syndrome
renal failure
septicaemia
amoebic liver abscess
toxic megacolon
11. What is the incubation period for norovirus infection?

48-96 hours
96-120 hours
8-16 hours
12-48 hours
1-6 hours
12. Chlorination is not effective against this, requires effective filtration of water

Yersinia
Shigella
Clostridium perfringens
Cryptosporidium
Bacillus cereus
13. What is the incubation period for salmonella infection?

1-6 hours
48-96 hours
96-120 hours
8-16 hours
12-48 hours
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