A model to determine sampling strategies and milk inoculum volume for detection of intramammary Staphylococcus aureus infections in dairy cattle by bacteriological culture

Buelow, Kenneth L.; Goodger, W. J.; Collins, Michael T.; Clayton, Murray K.; Nordlund, Ken; Thomas, Chester B.

doi:10.1016/0167-5877(95)00510-2

Cited by 11 publications

(15 citation statements)

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“…If the quantity of bacteria present in the milk is large, streaking a small volume of milk could be enough to detect the IMI [7]. On the contrary, if the quantity of bacteria present in the milk is small, a false negative diagnosis is probable if the volume of the inoculation is small.…”

Section: Figure 8 Geometric Mean Scc (᭜) and Its 95% CI (-) Of Quartmentioning

confidence: 99%

“…On the contrary, if the quantity of bacteria present in the milk is small, a false negative diagnosis is probable if the volume of the inoculation is small. Streaking 0.1 or 0.05 mL instead of 0.01 mL (recommended by the standard technique) greatly improved the sensitivity of identifying Staphylococcus aureus [7,24]. The sensitivity of detection of a bacteriologically positive result was found to be 77%, 85%, and 90% in cases of 0.01, 0.05, and 0.1 mL streaking of udder milk respectively [24].…”

Section: Figure 8 Geometric Mean Scc (᭜) and Its 95% CI (-) Of Quartmentioning

confidence: 99%

“…The determination of the IMI based on a single result is most of the time not very accurate [37]. Some chronically infected quarters eliminate bacteria in milk sporadically, leading to possible false negative results [7,29,43]. Taking repeated samples limits the number of false-negative samples.…”

Section: Figure 8 Geometric Mean Scc (᭜) and Its 95% CI (-) Of Quartmentioning

confidence: 99%

“…The sensitivity of the bacteriological 354 B. Djabri et al examination to detect infected quarters by Staphylococcus aureus goes from 60% if the bacteriological examination is done with single samples to 91% if the samples were taken for 3 successive days [7]. In this context, the IMI may also be defined considering the dynamics of the infectious process during the whole lactation, and not as if each bacteriological result was independent (as in most studies selected here).…”

Section: Figure 8 Geometric Mean Scc (᭜) and Its 95% CI (-) Of Quartmentioning

confidence: 99%

“…Other non-infectious factors (animal's age, lactation stage, breed, measurement equipment, fraction of milk sample) might have also a moderate impact [5,7,26,42].…”

Section: Introductionmentioning

confidence: 99%

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Quarter milk somatic cell count in infected dairy cows: a meta-analysis

et al. 2002

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-The aim of this paper was to evaluate the effects associated with intramammary infection (IMI) by a bacterium or a group of bacteria (Staphylococcus aureus, Streptococcus agalactiae, Streptococcus dysgalactiae, Streptococcus uberis, coliforms, Staphylococci other than S. aureus, and Corynebacterium bovis) on the somatic cell count (SCC) in quarter milk of dairy cows. Papers selected for analysis had to provide SCC values associated with the natural infection in quarters by different bacteria. Sampling for measurement of SCC and determination of the infection had to be done on the same day. Only papers published in English or in French after 1971 were considered. Twenty-one papers fulfilled the selection criteria. The animals sampled, the measurement techniques for SCC and the bacteriological identification, as well as the definition of the infection, all differed widely among the selected studies. The meta-analysis method was used to estimate both the mean SCC (arithmetic and geometric) value and the average increase on SCC of each type of infection. The geometric mean SCC in bacteriologically negative quarters was 68 000 c/mL. In case of IMI, the retained SCC was 357 000, 857 000, 547 000, 1 024 000, 1 151 000, 138 000 and 105 000 c/mL in quarters infected by Staphylococcus aureus, Streptococcus agalactiae, Streptococcus dysgalactiae, Streptococcus uberis, coliforms, staphylococci other than S. aureus and Corynebacterium bovis, respectively. The variation factors that could influence these SCC values and the bacteriological results are discussed. dairy cow / mastitis / somatic cell count / meta-analysis Résumé -Méta-analyse des effets de l'infection sur la concentration en cellules somatiques du lait de quartier chez la vache laitière. Le présent article a pour objectif d'évaluer l'effet associé à l'infection intra-mammaire (IIM) par une bactérie ou par un groupe de bactéries (Staphylococcus aureus, Streptococcus agalactiae, Streptococcus dysgalactiae, Streptococcus uberis, coliformes, 335

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Section: Figure 8 Geometric Mean Scc (᭜) and Its 95% CI (-) Of Quartmentioning

confidence: 99%

Section: Figure 8 Geometric Mean Scc (᭜) and Its 95% CI (-) Of Quartmentioning

confidence: 99%

Section: Figure 8 Geometric Mean Scc (᭜) and Its 95% CI (-) Of Quartmentioning

confidence: 99%

Section: Figure 8 Geometric Mean Scc (᭜) and Its 95% CI (-) Of Quartmentioning

confidence: 99%

“…Other non-infectious factors (animal's age, lactation stage, breed, measurement equipment, fraction of milk sample) might have also a moderate impact [5,7,26,42].…”

Section: Introductionmentioning

confidence: 99%

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