A 6–month–old infant presents to the 'diarrhoea clinic' unit with some dehydration. The most likely organism causing diarrhea is –
Entamoeba histolytica
Rotavirus
Giardia lamblia
Shigella
Ghai states - "In India Rotavirus and enterotoxogenic E.coli account for nearly half of the total diarrhoea) episodes among children".