[The effectiveness of vaccinating gilts against parvoviruses in a herd with endemic parvovirus infection].

An inactivated vaccine against swine parvovirosis with a lipoid adjuvant was tested in a herd infested with parvoviruses. The titre of the haemagglutination-inhibition antibodies was studied at the time of the first pregnancy in two groups of gilts included in the herd at the age of 7.5 months - one group vaccinated, the other left untreated.

[Detection of enzootic bovine leukemia virus using the syncytium test].

BLV detection by the syncytial test was performed in 27 heifers experimentally and naturally infected by the enzootic bovine leukosis virus (BLV). The presence of BLV was demonstrated in 94.7% of the animals.

[Immunoenzyme detection of enzootic bovine leukemia viruses (BLV) in cell cultures].

There is a description of the method of immunoenzymic test used for detection of enzootic bovine leukosis virus (BLV) on the cells of foetal lamb spleen (FLS) permanently producing BLV and on the lymphocytes of infected animals. In both cases (in FLS cells and lymphocytes) the presence of BLV was demonstrated by the immunoperoxidase test. Using the defined serums from the animals after experimental and natural infection, BLV was detected by the above-mentioned test in FLS cells in all cases of the use of positive serums with anti-BLV antibodies.

Antibodies to new variants of subtype A(H3 N2) influenza virus in pigs.

Following an explosive epidemic of A(H3N2) influenza among the human population of Czechoslovakia in 1983, haemagglutination-inhibiting antibodies (titre range 10-640) against strains A/Texas/77, A/Bangkok/79 and A/Philipines 2/83 were detected in 93% of sera collected from 135 pigs on three farms. Only 6.6% of sera were negative.