In vitro phagocytosis and killing of Corynebacterium equi by alveolar macrophages of foals.

M. C. Zink, J. A. Yager, J. F. Prescott, B. N. Wilkie

Research output: Contribution to journalArticlepeer-review

Abstract

Bronchoalveolar lavage was performed 5 times, sequentially, on 3 healthy foals while each foal was 6 to 63 days of age. Phagocytosis and bactericidal assays were performed on recovered alveolar macrophages. Corynebacterium equi and alveolar macrophages at a ratio of 10:1 were incubated for 1 hour in medium containing 1% heat-inactivated rabbit anti-C equi serum. After incubation, greater than 90% of the alveolar macrophages contained at least 1 ingested bacterium and each alveolar macrophage contained 9.4 +/- 1.0 bacteria (mean +/- SE). After alveolar macrophages and C equi were incubated for 1 hour in medium containing heat-inactivated pooled normal horse serum, approximately 24% of the alveolar macrophages contained at least 1 bacterium and each alveolar macrophage contained 0.8 +/- 0.7 bacteria. From 6 to 61 days of age, each foal had significantly (P less than 0.05) decreased phagocytic activity by alveolar macrophages, but a significant change in killing of C equi by alveolar macrophages was not found in the foals from 21 to 61 days of age. After incubating alveolar macrophages and C equi for 4 hours in vitro, approximately 75% of ingested C equi remained viable.

Original languageEnglish (US)
Pages (from-to)2171-2174
Number of pages4
JournalAmerican journal of veterinary research
Volume46
Issue number10
StatePublished - Oct 1 1985
Externally publishedYes

ASJC Scopus subject areas

  • veterinary(all)

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