Pulse Brain · Growing Health Evidence Index
Peer-reviewed

<i>Coxiella burnetii</i> seroconversion in neonatal calves in an infected dairy herd attributable to ingestion of imported colostrum replacer rather than vertical transmission

Ana Rabaza, Matías A. Dorsch, Mark C. Eisler, Caroline da Silva Silveira, Melissa Macías-Rioseco, Virginia Aráoz, Anderson Saravia, D. Caffarena, Camila Ferrando, Alejandro Mendoza, Martín Fraga, Leticia Zarantonelli, Federico Giannitti

Journal of Veterinary Diagnostic Investigation · 2026

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Summary

In April-June 2017, a cluster of 4 third-trimester abortions caused by <i>Coxiella burnetii</i> was diagnosed on a dairy farm with 356 Holstein cows in Uruguay. We investigated 1) the seroprevalence of <i>C. burnetii</i> in cows delivering normal calves in this herd, 2) whether non-aborting cows gave birth to seropositive and/or PCR-positive newborn calves in the year of the abortion cluster, and 3) whether seronegative newborn calves seroconverted after ingesting colostrum replacer. In March-September 2017, serum samples were collected from 133 calving cows and their calves immediately after birth and before colostrum ingestion. All 266 sera were analyzed for anti-<i>C. burnetii</i> IgG by ELISA. Additionally, 179 blood samples from some of these animals (82 cows, 97 calves) were PCR-test

Source type
Peer-reviewed study
DOI
10.1177/10406387261426475
Catalogue ID
BFmobghsy5-heo4i3
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