Experimental trichophytosis in calves caused by cultures of Trichophyton verrucosum and Trichophyton equinum

Tests were performed on 130 one-month-old calves. In 16 animals, treatment with a suspension of Trichophyton verrucosum culture at the dosage of 5 mil. conidia for an area of 10 x 10 of the clipped skin caused clinical trichophytic changes. The length of the incubation time was shorter in the calves scarified before inoculation of the infecting culture (10 to 13 days), as compared with the group of calves without scarification of the skin (11 to 19 days). Only 3 in 6 calves, infected by the same dose into non clipped skin, did contract trichophytosis, manifesting themselves as separate mycotic deposits, which appeared 26 to 35 days after inoculation. Trichophytic changes lasted longest in the group with scarification of the infected area. The ID50 in T. verrucosum and T. equinum cultures was about 1500 conidia per one calf in the case of the method of infecting into clipped scarified skin (area 100 sq cm). A 10 times lower dose (150 conidia per one calf) of the T. verrucosum suspension did not induce visible mycotic changes, but the T. equinum inoculation produced infection in one of 10 calves.     

Vaccination of sows with the "Dessau" Salmonella-cholerae-suis adsorbate vaccine]

Experiments on the immunization of sows were conducted on six premises. The results justify immunization of breeding animals as part of a control programme for salmonellosis in pigs.     

A new treatment for trichophytosis of cattle]

A new way to treat ringworm in calves and young cattle giving 1 ml formaldehyde solution (10%) per kg BW intravenously is described.     

Mycoplasma (M.) bovis antiserum "Dessau"--a diagnostic material for the identification of M. bovis

Mycoplasma bovis antiserum "Dessau" was used to investigate 4,553 mycoplasma strains, between 1985 and 1987, using a method described elsewhere. This diagnostic Agent is successfully used at present at all Regional Institutes of Veterinary Services throughout the GDR.     

Comparative studies of the standardization of erysipeloid immune sera "Dessau" from swine using the mouse-protection test and ELISA]

Different serological methods were used in determining the valence of red murrain immune sera. By using a grow test it is possible to accomplish an immunological differentiation of the immune sera. The used ELISA was tested in comparison to the conventional mouse protective test (PRIGGE, 1950) with regard to its valuation of immune sera. Both procedures have been tested on a possible correlation. In almost all cases a correlation between high titres in ELISA and a mouse protective value over 100 I.E. could be proven. The statistical processing of the test results proved an assumed correlation of both procedures. But it is necessary to carry out further research in order to be able to recommend this procedure as an alternative for the mouse protection test.