<prompt> True about Giardia is -May cause travellers diarrheaGiardia inhabits mainly ileumTrophozoites are infective to manNone of the above  <response>: Option 1 Agents of Travellers diarrhea: Enterotoxigenic Escherichia coli 10-45- Single most impoant agent Enteroaggregative E. coli 5-35- Emerging enteric pathogen with worldwide distribution Campylobacter jejuni 5-25- More common in Asia Salmonella- Common in India Others- Aeromonas, Plesiomonas, and Vibrio cholerae Norovirus 10 - Associated with cruise ships Rotavirus 5 - Common among children Parasites 0-10 : Giardia lamblia, Cryptosporidium, Entamoeba histolytica, Cyclospora Option 2, 3 GIARDIA LAMBLIA: Habitat:mainly Inhabits Mucosa of duodenum and upper ileum of man. Morphology: 2 forms: Trophozoite and Cyst Infective stage: Cyst Route of infection: Feco-oral route. Giardia may also cause travelers diarrhea. Predisposing conditions to giardiasis are a gammaglobulinemia, common variable immunodeficiency and selective IgA-deficiency. 