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MCQs in Tropical Medicine

Rob Skelly DTM+H FRCP

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Answer 48

Travellers' diarrhoea
False a. the single most common causative organism is entero-invasive E. coli
False b. has an incubation period of at least 48 hours
True c. may be due to Aeromonas ssp.
True d. may be due to Cryptosporidium
True e. should be treated with antibiotics

Table 48

Causes of travellers' diarrhoea
enterotoxigenic E.coli (c.40% of cases)
enteroinvasive E.coli
Campylobacter jejuni
no pathogen found (20% of cases)

The diarrhoea usually begins in the first few days. Antibiotics such as ciprofloxacin, especially if started early, reduce the duration of diarrhoea and have a good safety profile in adults. Non-gastrointestinal pathogens such as Plasmodium falciparum can also cause diarrhoea.

Copyright: Rob Skelly 2006