Which of the following is the most common cause of traveller's diarrhoea?

Which of the following is the most common cause of traveller’s diarrhoea?

Entamoeba histolytica
Escherichia coli  This is the correct answer
Giardia lamblia
Shigella flexneri
Yersinia enterocolitica

Enterotoxigenic E coli is the commonest cause of traveller’s diarrhoea and is usually a self-limiting
condition.
Usually, no treatment or investigation is required for this brief diarrhoeal illness.
Other causes that may be associated with prolonged diarrhoea include Giardia and amoebiasis.
Chronic diarrhoea merits investigation.