TY  - JOUR
U1  - Wissenschaftlicher Artikel
A1  - Krebs, Isabel
A1  - Zhang, Yanchao
A1  - Wente, Nicole
A1  - Leimbach, Stefanie
A1  - Krömker, Volker
T1  - Severity of Clinical Mastitis and Bacterial Shedding
JF  - Pathogens
N2  - The aim of this cross-sectional study was to investigate associated factors of the severity of clinical mastitis (CM). Milk samples of 249 cases of CM were microbiologically examined, of which 27.2% were mild, 38.5% moderate, and 34.3% severe mastitis. The samples were incubated aerobically and anaerobically to investigate the role of aerobic and anaerobic microorganisms. In addition, the pathogen shedding was quantitatively examined, and animal individual data, outside temperature and relative humidity, were collected to determine associated factors for the severity of CM. The pathogen isolated the most was Escherichia coli (35.2%), followed by Streptococcus spp. (16.4%). Non-aureus staphylococci (NaS) (15.4%) and other pathogens (e.g., Staphylococcus aureus, coryneforms) (15.4%) were the pathogens that were isolated the most for mild mastitis. Moderate mastitis was mostly caused by E. coli (38%). E. coli was also the most common pathogen in severe mastitis (50.6%), followed by Streptococcus spp. (16.4%), and Klebsiella spp. (10.3%). Obligate anaerobes (Clostridium spp.) were isolated in one case (0.4%) of moderate mastitis. The mortality rate (deceased or culled due to the mastitis in the following two weeks) was 34.5% for severe mastitis, 21.7% for moderate mastitis, and 4.4% for mild mastitis. The overall mortality rate of CM was 21.1%. The pathogen shedding (back logarithmized) was highest for severe mastitis (55,000 cfu/mL) and E. coli (91,200 cfu/mL). High pathogen shedding, low previous somatic cell count (SCC) before mastitis, high outside temperature, and high humidity were associated with severe courses of mastitis.
KW  - clinical mastitis
KW  - Euterentzündung
KW  - Milchvieh
KW  - dairy cow
KW  - severe mastitis
KW  - bacterial shedding
Y1  - 2023
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:960-opus4-29581
SN  - 2076-0817
SS  - 2076-0817
U6  - https://doi.org/10.25968/opus-2958
DO  - https://doi.org/10.25968/opus-2958
N1  - Gefördert mit Mitteln des Publikationsfonds der Bibliothek der Hochschule Hannover.
VL  - 12
IS  - 9
PB  - MDPI
ER  -