Asymptomatic endemic Chlamydia pecorum infections reduce growth rates in calves by up to 48 percent.

PLoS One · 2012 · PMC3443228 · PMID 23024776

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highly significantno p-value reported

[30] unequivocally demonstrated causality of latent chlamydial infection when Chlamydia -vaccinated animals showed a highly significant decline in milk somatic cell counts over mock-vaccinated animals.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.