Non-aureus staphylococci and mammaliicocci isolated from bovine milk in Italian dairy farms: a retrospective investigation

Non- aureus staphylococci and mammaliicocci (NASM) are associated with bovine mastitis and increased milk somatic cell count (SCC) but their relationships with mammary gland health at the species level are not clearly defined. Regional differences have also been reported in their specific prevalence...

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Published in:Veterinary research communications 2024-02, Vol.48 (1), p.547-554
Main Authors: Addis, Maria Filippa, Locatelli, Clara, Penati, Martina, Poli, Sara Fusar, Monistero, Valentina, Zingale, Lucia, Rota, Nicola, Gusmara, Claudia, Piccinini, Renata, Moroni, Paolo, Bronzo, Valerio
Format: Article
Language:English
Subjects:
Animals
Biomedical and Life Sciences
Brief Report
Cattle
Cattle Diseases - microbiology
Cow's milk
Dairy farms
Epidemiology
Farms
Female
Life Sciences
Mammary gland
Mastitis
Mastitis, Bovine - epidemiology
Mastitis, Bovine - microbiology
Milk
Milk - microbiology
Retrospective Studies
Species
Staphylococcal Infections - veterinary
Staphylococcus epidermidis
Veterinary Medicine/Veterinary Science
Zoology
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Summary:Non- aureus staphylococci and mammaliicocci (NASM) are associated with bovine mastitis and increased milk somatic cell count (SCC) but their relationships with mammary gland health at the species level are not clearly defined. Regional differences have also been reported in their specific prevalence. The implementation of MALDI-TOF MS in milk microbiology is generating large and dependable datasets with the potential of providing useful epidemiological information. We present the retrospective analysis of 17,213 milk samples sent to our laboratory in 2021–2022, including 13,146 quarter samples from cows with subclinical (SCM) or clinical mastitis (CM) from 104 farms, and 4,067 composite herd survey (HS) samples from 21 farms. NASM were isolated from 21.12% of SCM, 11.49% of CM, and 15.59% of HS milk samples. The three most frequently identified NASM in SCM milk were Staphylococcus chromogenes (33.33%), S. haemolyticus (26.07%), and S. epidermidis (10.65%); together with S. microti and S. hyicus , these species were significantly more prevalent in quarters with SCM (p 
ISSN:0165-7380
1573-7446
1573-7446
DOI:10.1007/s11259-023-10187-x