High prevalence of Sarcocystis calchasi in racing pigeon flocks in Germany.

PLoS One · 2019 · PMC6464325 · PMID 30986233

Europe PMC DOI

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showed a trendno p-value reported

Half-covered or open aviary constructions showed a trend of increase of the prevalence rate, while anti-coccidian treatment and acidified drinking water had no effects.

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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.