Biomedical subjects
Publications and source records attributed to C F Hall.
Deaths of cockatiel nestlings caused by Candida albicans, and of a pigeon caused by air-sac infection with Absidia corymbifera, are described. Lesions in the cockatiels were pseudomembranes and ulcers in the mouth, esophagus, and crop. In the pigeon the air sacs were thickened and contained a grayish gelatinous exudate.
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The deaths of peafowls and a cockatoo were respectively traced to insecticide and lead toxicities. The specific insecticide could not be identified but was demonstrated in the liver by use of fruit flies. The liver of the cockatoo contained 7.1 ppm of lead. The source was presumably a plastic feeder painted with a leaded paint.
A severe outbreak of erysipelas causing high mortality was observed in Coturnix breeder quails. Possible source(s) of erysipelothrix infection in the flock and subsequent infections due to Pasteurella multocida, Salmonella typhimurium, and Staphylococcus aureus are discussed.
Immunogenicity of an oil-emulsified Escherichia coli (O1:K1) bacterin with an aqueous-phase-to-oil-phase ratio of 1:4 was evaluated in chickens. Chickens were vaccinated subcutaneously with 0.5 ml of the bacterin at 4 and 6 weeks of age. At 8 weeks, the vaccinated chickens and unvaccinated controls were challenged via air sacs with 10(4) colony-forming units (CFU) of homologous E. coli. Vaccinated chickens were protected against active respiratory infection in that they (a) gained body weights comparable to those in unvaccinated, unchallenged chickens, (b) suffered no morbidity or mortality, (c) had gross lesions so mild that the scored values were comparable statistically to the 0 lesion scores of the negative controls, and (d) did not yield E. coli when their heart blood, pericardial sacs, livers, and air sacs were cultured. Unvaccinated challenged chickens had severe respiratory distress, suffered 36% mortality, and had average air sac, pericardial sac, and liver lesion scores significantly (P less than or equal to 0.05) different from both the vaccinated and negative control chickens. Also, the challenge strain of E. coli only was isolated from the affected tissues of 5 of 14 chickens. Protection against active respiratory infection was again demonstrated in a second experiment, though the challenge dose was 1.06 X 10(6) CFU of E. coli. The immunity, however, was partially overcome, as the vaccinated chickens gained less body weight and the scored values for lesions in the air sacs, pericardial sacs, and livers were significantly higher than those of the negative controls (P less than or equal to 0.05).
Mycobacteriosis was diagnosed in five psittacine birds: a blue-headed pionus parrot (Pionus menstruus), three grey-cheeked parakeets (Brotogeris pyrrhopterus), and a red-crowned Amazon parrot (Amazona dufresniana rhodocorytha). Signs were marked muscular wasting, anemia, recurrent diarrhea, and dulling or loss of feathers. Lesions were commonly present in the intestines, livers, and spleens, suggesting an oral route of infection. Other tissues in which granulomas were found were the oropharynx, pancreas, and kidneys. The pionus parrot had pulmonary tuberculosis involving both lungs and air sacs. One grey-cheeked parakeet exhibited no gross tubercular lesions. Microscopic lesions varied from noncaseous histiocytic foci to granulomatous "tubercles" with caseous necrosis.
Immunogenicity of an aqueous Mycoplasma gallisepticum (MG) bacterin and two oil-emulsified bacterins with aqueous-phase-to-oil-phase ratios of 1:2 and 1:4 were evaluated in 3 groups of 5-week-old MG-free White Leghorn chickens. Group 4 chickens were nonimmunized controls. Group 1, 2, and 3 chickens received primary immunizations with 0.5 ml of bacterin subcutaneously (SC). Six weeks later, half of the vaccinated chickens received a second immunization (0.5 ml SC). Six weeks after the last dose of vaccine, all 4 groups of chickens were challenged intraocularly with a 24-hr broth culture of pathogenic MG ("R' strain). The geometric mean hemagglutination-inhibition antibody titers (GMT) of non-immunized, once-immunized, and twice-immunized chickens were compared at 2-week intervals following primary immunization, secondary immunization, and challenge. Both oil-emulsified bacterins stimulated significantly higher (P less than or equal to 0.05) levels of antibody than the aqueous bacterin after the primary and secondary immunizations. Following challenge with pathogenic MG, the GMT in the immunized and non-immunized chickens approached comparable values. The highest GMT in groups 1, 2, 3, and 4 respectively were: a) primary response, 19, 99, 121, and 11; b) secondary response, 105, 423, 793, and 21; and c) challenge response, 171, 278, 300, and 160. After challenge there was a further rise of antibody level in non-immunized chickens, those immunized with the aqueous bacterin, and those immunized only once with the oil-emulsified bacterins. This suggested a lack of protection against challenge. However, there was no increase of GMT in chickens immunized twice with the oil-emulsified bacterins.
Giardia infection causing high morbidity and mortality in parakeets in 3 commercial aviaries is described. The disease was successfully treated with dimetridazole.