Children with autumn diarrhea were investigated by methods of polyacrylamide gel electropho-resis (PAGE) from November

to December

1985. The characteristic rotavirus RNA genome patterns were found in 79 out of 108 cases (73.1%). 39 cases were of long type and 40 cases were of short type. There was no difference in clinical manifestations between these two subgroups of patient. The onset of the disease was acute. All patients passed the watery stools

8-10 times a day. 50.6% of the cases had vomiting 1-5 times a day

with mild or moderate dehydration. The average course of illness was 7.4 days. No death occured in our 79 cases