September/2005

ANSWER 20=C

The child has an acute illness associated with diarrhea. The most common virus to cause this illness is rotavirus.  This review on acute diarrheal diseases seems useful :

(http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=16145337&query_hl=13)