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Biomedical subjects

D A Dyson

Publications and source records attributed to D A Dyson.

24 records · Page 2Linked to original sources
PubMed1975

The virulence of vaccine strains of Mycoplasma mycoides var. mycoides recovered from inoculated cattle.

The T1 and KH3J attenuated strains of M mycoides, well-known in Africa for immunisation against contagious bovine pleuropneumonia, were recovered from the lymph nodes of cattle at intervals up to three months after vaccination. Virulence titrations in mice indicated that the organisms recovered from cattle were of no greater virulence than the strains used for inoculation. There was, therefore, no suggestion that the use of attenuated vaccines in the field might be associated with reversion to virulence after inoculation.

Animals↗
PubMed1975

Contagious bovine pleuropneumonia: mouse-protective antibody in the sera of infected and vaccinated cattle.

Cattle produced humoral mouse-protective antibody (MPA) to Mycoplasma mycoides var mycoides as a result of natural infection, hyperimmunisation, vaccination with well-known strains of living vaccines or vaccination with killed cultures. Bovine MPA was distinct from complement-fixing and precipitating antibodies and was frequently detected in their absence, particularly in the sera of vaccinated--as opposed to naturally infected--cattle. In view of its defensive role in artificially-infected mice, it seems likely that such antibody plays a part in resistance to the disease in cattle. High levels of MPA followed inoculation of cattle with killed concentrated culture containing adjuvant; this finding merits further investigation, as it may lead to improved methods of vaccination.

Animals↗
PubMedDate not supplied

Acute and sub-acute paraquat poisoning in a pack of foxhounds.

A case of paraquat poisoning in a pack of foxhounds is reported. The incident provided a unique opportunity to compare residues levels of paraquat in dogs showing symptoms of acute and sub-acute poisoning. Paraquat was detected in the urine up to six days after exposure. A high performance liquid chromatography method for determining paraquat in tissue is described.

Acute Disease↗