Abstract
Pasteurella (P.) multocida is a heterogeneous species of Gram-negative bacteria which are common commensals of the upper respiratory system of various mammal and bird species, but are also opportunistic contagious zoonotic pathogens which cause a wide spectre of infections in domestic animals and humans. P. multocida is a rare cause of mastitis in dairy cows. The source of infection mainly remains unknown, mastitis usually is acute, and the therapy by intramammary administration of antibiotics does not lead to satisfactory results. Lethality is possible due to presence of endotoxins in blood. Literature data on P. multocida mastitis in dairy cows is particularly scarce, which is why such a case is described in the current work, with past medical history, clinical findings, laboratory diagnostics and therapeutic approach.
Highlights
A case of Pasteurella (P.) multocida bovine mastitis occurred on a dairy farm with 14 cows, out of which 10 were milked
The isolated species was identified as P. multocida according to the following criteria: the colonies were greyish in colour, mucoid and with a sweetish odour, did not produce haemolysis, did not grow on MacConkey agar, and were Gram-negative bipolarstaining coccobacilli, oxidase and catalase positive, capable of producing indole, and fermenting glucose, sucrose and mannitol; they were urease-negative and did not produce acid from lactose, xylose or maltose
The microbiological examination of milk sampled from the treated quarter was repeated 14 days after the end of the therapy but P. multocida was not isolated, which confirmed the infection was microbiologically resolved
Summary
A case of Pasteurella (P.) multocida bovine mastitis occurred on a dairy farm with 14 cows, out of which 10 were milked. After 24 h of incubation in aerobic and microaerophilic conditions, on the blood agar inoculated with milk from the diseased mammary quarter, the growth of relatively large, mucoid, greyish, non-haemolytic colonies, with a characteristic sweetish odour was observed.
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