The ability of four strains of Streptococcus uberis to induce clinical mastitis after intramammary inoculation in lactating cows
New Zealand Veterinary Journal, Volume 64, Issue 4, pp 218-223, Jul 2016
Publisher: Taylor and Francis
AIM: To compare the ability of four strains of
MATERIALS AND METHODS: Four field strains of
RESULTS: Clinical mastitis was diagnosed in 26/48 (54%) challenged quarters. Challenge with strain S418 resulted in more cases of mastitis (12/12 quarters) than strains SR115 (7/12), 26LB (6/12) or S523 (1/12), and the mean interval from challenge to first diagnosis of mastitis was shorter for S418 than the other strains (p<0.001). The proportion of quarters from which
CONCLUSIONS: There were significant differences between the strains in the proportion of quarters developing clinical mastitis, the interval to mastitis onset, SCC following challenge and the proportion of clinical cases from which
CLINICAL RELEVANCE: Experimental challenge models can be used to compare infectivity and pathogenicity of different strains of mastitis-causing bacteria, the efficacy of pharmaceutical products and host-responses in a cost-effective manner.
KEY WORDS: Mastitis, Streptococcus uberis, challenge model, bovine, bacterial strains
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