Evaluation of a new diagnostic tool for IBR surveillance in dairy herds: a field study in Cuneo province

This chapter discusses the important epidemiological characteristics of tests and their practical application and interpretation in epidemiological studies and surveillance activities. The epidemiological evaluation of tests is also briefly discussed.

10.1079/9781845936839.0089

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Increasing prevalence of Coxiella burnetii seropositive Danish dairy cattle herds

Acta veterinaria Scandinavica (2014)

Jens Frederik Agger Suman Paul

A study based on bulk tank milk samples from 120 randomly selected dairy cattle herds was conducted to estimate the prevalence of Coxiella burnetii seropositive dairy herds, to describe the geographical distribution, and to identify risk factors. Using the CHEKIT Q-fever Antibody ELISA Test Kit (IDEXX), the study revealed a prevalence of 79.2% seropositive herds, 18.3% seronegative herds, and 2.5% serointermediate herds based on the instructions provided by the manufacturer. Multifactorial logistic regression showed statistically significant associations (P < 0.01) between C. burnetii seropositivity and increasing herd size (OR = 1.02 per cow increment) and increasing regional average number of cattle per dairy herd (OR = 1.02 per animal increment). Herds >150 cows had 17.9 times higher odds of testing positive compared to herds <80 cows. The regional average number of cattle herds per square kilometer was borderline significantly related to the occurrence of seropositive dairy herds (P = 0.06). The results indicate an increased prevalence of seropositive dairy herds since the previous survey in 2008 and an adverse impact of increasing herd size and cattle density on the risk of seropositivity.

Coxiella burnetii

Bulk tank

Q fever

Prevalence

10.1186/s13028-014-0046-2

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Bulk tank milk, reliable tool for diagnosing Q Fever in dairy herds?

G. Czaplicki J. Y. Houtain Cédric Mullender C. Manteca Claude Saegerman

Bulk tank

Q fever

Milk fever