Coagulase Positive Staphylococci From Bulk Milk Supplies Low in Solids‐not‐fat

The classification of the predominant types of bacteria found in 87 farm milk supplies, examined within 8–10 hr of production, was done by plating on Yeastrel‐milk agar, incubating for 72 hr at 30° and picking 24 colonies at random from each countable plate for detailed study. Although the results indicate some general trends, such as the predominance of micrococci in milk of low count (< 2 times 104 colonies/ml), the co‐dominance of streptococci, corynebacteria and micrococci in milk with colony counts between 2 times 104 and 2 times 105/ml, and the dominance of nonpigmented Gram‐negative rods and streptococci in the high count milks (2 times 105–5 times 106 colonies/ml), several milk samples, irrespective of colony count level, had a characteristic individual microflora dominated by either corynebacteria, aerobic sporeformers, coli‐aerogenes organisms, fluorescent pseudomonads or flavobacteria.

Section: Microflora Of Raw Milkmentioning

confidence: 99%

The Microflora of Raw Milk as Determined by Plating on Yeastrel‐milk Agar Incubated at 30°

Thomas¹,

Hobson²,

Bird³

et al. 1962

“…A SHORT review of the literature on the isolation of coagulase positive staphylococci from milk was made by Innes (1956) in which he drew attention to the suggestion of Schalm & Woods (1953) that pathogenic udder micrococci produce p-toxin and coagulation of rabbit plasma. Innes isolated 74 coagulase positive staphylococci from bulk milk, and by suitable haemolysin pattern tests established that 99 yo might be classified as potentially pathogenic strains, and 75 yo were probably responsible for subclinical conditions of the udder.…”

mentioning

confidence: 99%

The Isolation of Coagulase Positive Staphylococci From Routine Composite Milk Samples

Walters¹

1959

SUMMARY: Composite morning milk samples were taken once weekly for 9 weeks from 24 dairy farms. In all 208 samples were tested, and coagulase positive staphylococci (aureus, albus and citreus) were isolated from 127 (61%). The week by week recovery of these staphylococci from individual farm samples varied between 11% and 88% Penicillin resistant coagulase positive strains were recovered from 20 samples (10%).

Further Studies on the Disinfection of Cows’ Teats Prior to Milking

Mckenzie¹,

Hunter²

1961

A comparison has been made of the disinfecting efficiency on cows' teats, of a hypochlorite and a quaternary ammonium disinfectant. Little difference in efficiency was found between the disinfectants when used at 200 p/m. Hypochlorite was slightly more effective in eliminating coli-aerogenes bacteria, but there was no evidence of greater survival of other Gram-negative organisms with the quaternary disinfectant. Micrococci were the main survivors and, in summer, coagulase positive staphylococci formed a considerable proportion of these.