Work

Susceptibility of Escherichia coli Isolated from Intramammary Infections to Phagocytosis by Bovine Neutrophils

Year: 1992

Type: article

Abstract: Thirteen Escherichia coli isolated from naturally occurring IMI were tested for susceptibility to phagocytosis by bovine blood neutrophils. Isolates were opsonized in pooled serum collected from nine healthy lactating cows. Bacteria isolated from IMI first diagnosed within 3 d after calving were more resistant to phagocytosis than were isolates from IMI originating during either the first half of the dry period or later during lactation. Duration of the IMI was negatively correlated with both phagocytic index and percentage of neutrophils phagocytizing within bacterial isolates from IMI originating at calving and during lactation. Phagocytosis was independent of duration of IMI within isolates from IMI originating during the first half of the dry period. Susceptibility to in vitro phagocytosis by neutrophils was not related to O antigen serotype, encapsulation, or growth in dry cow secretion.

Source: Journal of Dairy Science

DOI: 10.3168/jds.s0022-0302(92)78108-9

Authors: J.S. Hogan, D.A. Todhunter, K.L. Smith, P.S. Schoenberger, R.A. Wilson, R.A. Wilson

Institutions: The Ohio State University, Pennsylvania State University

Language: English

Topic: Milk Quality and Mastitis in Dairy Cows

Subfield: Animal Science and Zoology

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDGs: Zero hunger, Good health and well-being

Open Access status: bronze

Funder: Ohio State University