[Antigenic drift of a strain of influenza equi virus isolated in France during the winter of 1978-1979].

A strain of Influenza Equi virus isolated during winter 1978-1979 has been compared with Influenza A/Equine/Miami/1/63 (H3N8) strain by cross reactions performed by radial haemolysis (RH) and hemagglutination inhibition (HAI) test. Specific antisera were prepared on hens and guinea-pigs. Results differed according to the species on which the sera were prepared and the two methods of titration of the antibodies.

High-pressure liquid chromatographic analysis of veterinary anthelmintics I: Quantitative determination of tetramisole.

High-pressure liquid chromatography was used with a 10-micron C8-type bonded silica gel column to quantitate the tetramisole in veterinary anthelmintic preparations. The chromatographic elution time was less than 10 min, and other compounds present in the products analyzed did not interefere.

Enzootic bovine leukosis: an epidemiological survey among cattle in the west of France by precipitating antibody detection.

In order to inform the sanitary veterinaty authorities, an epidemiological survey was carried out in the West of France to appreciate the level of infection by BLV in cattle. More than 10,000 sera from 763 herds were tested by agar gel immuno-diffusion. The animals were more than one-year-old dairy cattle.

[Immunization of ewes against experimental Brucella melitensis infection: comparison of eleven vaccines].

A comparative study of 11 antibrucellic vaccines has been carried out in the Limousin region of 360 ewe-lambs divided into groups of 30, a 12th group serving as control. After being vaccinated at 8 months, the ewe-lambs were covered between 9 1/2 and 10 1/2 months, then infected at 11 months with Br. melitensis strain 53 H 38 by instillation of 4 x 10(6) germs on the conjonctiva.

[Comparison between the official indirect method and the direct method of control of vaccines against sheep enterotoxemia].

The official methods of control of vaccines against sheep enterotoxemia are indirect in two ways : on the one hand they are carried out on animals for which the vaccine is not intended, and on the other hand they test only an immunological serum reaction. Another method consisting of direct testing by intravenous injection of toxin has been carried out on mice previously vaccinated with different doses. It has been shown that it is possible to obtain a certain level of protection giving a good dose-effect relation.

[Comparative dose-effect relationship of a tuberculin standard on guinea pig sensitivity, using living and dead tuberculosis bacilli].

The sensitization of guinea pigs utilized for tuberculin titration may be obtained by a BCG primo-vaccination followed by an inoculation of live, virulent Myc. tuberculosis. This method, which results in a sub-evolutive form of tuberculosis, gives a satisfactory sensitization level but has the disadvantage of utilizing animals which are germ carriers and therefore dangerous.