Susceptibility of Escherichia coli Isolated from Intramammary Infections to Phagocytosis by Bovine Neutrophils
Open accessAbstract
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.
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Escherichia coli isolated from intramammary infections originating during the periparturient period were more resistant to phagocytosis than isolates from infections originating in the early dry period or during lactation.
“Escherichia coli isolated from intramammary infections originating during the periparturient period were more resistant to phagocytosis than isolates from infections originating in the early dry period or during lactation [29].”
From Coliform mastitis (2003) · cites this paper as [29]
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- Authors
- Hogan, J. S., Todhunter, D. A., Smith, K. L., Schoenberger, P. S., Wilson, R. A., & Wilson, R. A.
- Affiliations
- The Ohio State University (US)
- Venue
- Journal of Dairy Science
- Publisher
- American Dairy Science Association
- Published
- 1992-12
- Volume
- 75
- Issue
- 12
- Pages
- 3324-3329
- ISSN
- 0022-0302 (ISSN-L)
- OpenAlex
- W2024079711
- Cited by
- 10
- References
- 13
- Citations by year
- 2026: 1 · 2020: 2 · 2017: 1
- FWCI
- 0.84
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Journal of Dairy Science (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Ohio State University
- Topics
- Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Milk Quality and Mastitis in Dairy Cows
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Escherichia coli research studies
- Life Sciences › Immunology and Microbiology › Microbiology › Microbial infections and disease research
- Keywords
- Escherichia coli, intramammary infection, bovine mastitis, phagocytosis, neutrophils, opsonization, lactating dairy cows, dry period, phagocytic index, bacterial virulence, bacterial encapsulation
- MeSH terms
- Animals, Cattle, Cattle Diseases, Escherichia coli, Escherichia coli Infections, Female, Lactation, Mammary Glands, Animal, Neutrophils, Phagocytosis, Pregnancy
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