[Rotavirus infections in XXXX ].

@entity1707 @entity294 @entity1902 @entity325 @entity6425
Rotaviruses were found in the study of 123 @entity1707 and 132 fecal samples from animals with @entity294 . Employed were the method of immunofluorescence and the high concentration of virions (10(4) up to 10(9)/cm3). As high as 57.3 per cent of the fecal extracts proved positive for rotaviruses. In 14.3 per cent of the extracts a group-specific rotavirus antigen was established via the agar gel immunodiffusion, and 30.9 per cent of the intestinal cross sections were positive as demonstrated through immunofluorescence. Conditionally, the cases of @entity1902 are divided into two types--early and late. The first ones have been seen in sucking piglest at the age of 10-15 days, and with the growing of the epizootic wave--in 3-day-old ones, too. The second type of @entity1902 have been described in young @entity1707 fifteen days after weaning, The death rate with sucking @entity1707 was found to vary from 7 to 17 per cent, and it was 5 per cent with weaned ones. High mortality rate (82 per cent) was observed on a farm where a @entity325 with transmissive @entity1902 was noted. The diagnosed cases of @entity6425 prevailed in the cold months of the year (autumn-winter). On two farms the disease was established in the summer. The serologic examination of the blood sera of sows revealed group-specific antibodies to rotaviruses in 71 per cent of the cases. The percent of seroagents with the young sows ranged from 50 to 63.3 per cent, while with the adult ones it was 87 to 100 per cent. Discussed is the link between the low titer of natural immunity and the aspects of the epizootic process with rotavirus @entity294 .
