Transmission Dynamics of Corynebacterium spp. Within Two Danish Dairy Cattle Herds
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Transmission Dynamics of Corynebacterium spp. Within Two Danish Dairy Cattle Herds. / Kirkeby, Carsten; Halasa, Tariq; Farre, Michael; Chehabi, Galal Nazih; Græsbøll, Kaare.
I: Frontiers in Veterinary Science, Bind 8, 735345, 2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Transmission Dynamics of Corynebacterium spp. Within Two Danish Dairy Cattle Herds
AU - Kirkeby, Carsten
AU - Halasa, Tariq
AU - Farre, Michael
AU - Chehabi, Galal Nazih
AU - Græsbøll, Kaare
N1 - Publisher Copyright: © Copyright © 2021 Kirkeby, Halasa, Farre, Chehabi and Græsbøll.
PY - 2021
Y1 - 2021
N2 - Intramammary infections (IMI) can cause mastitis, a prevalent and costly infectious disease in dairy cattle worldwide. The IMI is caused by a range of bacteria, including Corynebacterium spp. Knowledge of the transmission dynamics of pathogens is generally sparse but essential to support decision-making; such as input to bioeconomic models. In this observational study, we explored the transmission dynamics of Corynebacterium spp. in two different Danish dairy cattle herds by testing monthly quarter-level milk samples of all lactating cows for 1 year. We estimated the prevalence for herd 1 and 2 to 24 and 11.7%, respectively, and the mean quarter-level incidence to be 8 and 6.5% per month, respectively. We compared a model for indirect transmission via the environment with a model with the direct contagious transmission and found that the latter model best explained the data. We estimated the daily mean quarter-level transmission rate to be 0.016 and 0.018 cases/quarter-day for herd 1 and 2, respectively. The mean recovery rate was 0.012 and 0.016 for herd 1 and 2, respectively. Consequently, the basic reproduction number for herd 1 and 2 was 1.27 and 1.10, respectively. This study highlights that Corynebacterium spp. can be prevalent within a herd and transmit directly between cows. Thus, future studies should investigate cost-effective control measures against Corynebacterium spp.
AB - Intramammary infections (IMI) can cause mastitis, a prevalent and costly infectious disease in dairy cattle worldwide. The IMI is caused by a range of bacteria, including Corynebacterium spp. Knowledge of the transmission dynamics of pathogens is generally sparse but essential to support decision-making; such as input to bioeconomic models. In this observational study, we explored the transmission dynamics of Corynebacterium spp. in two different Danish dairy cattle herds by testing monthly quarter-level milk samples of all lactating cows for 1 year. We estimated the prevalence for herd 1 and 2 to 24 and 11.7%, respectively, and the mean quarter-level incidence to be 8 and 6.5% per month, respectively. We compared a model for indirect transmission via the environment with a model with the direct contagious transmission and found that the latter model best explained the data. We estimated the daily mean quarter-level transmission rate to be 0.016 and 0.018 cases/quarter-day for herd 1 and 2, respectively. The mean recovery rate was 0.012 and 0.016 for herd 1 and 2, respectively. Consequently, the basic reproduction number for herd 1 and 2 was 1.27 and 1.10, respectively. This study highlights that Corynebacterium spp. can be prevalent within a herd and transmit directly between cows. Thus, future studies should investigate cost-effective control measures against Corynebacterium spp.
KW - Corynebacterium
KW - dairy cows
KW - intramammary infection
KW - mastitis
KW - transmission dynamics
U2 - 10.3389/fvets.2021.735345
DO - 10.3389/fvets.2021.735345
M3 - Journal article
C2 - 34497843
AN - SCOPUS:85114378644
VL - 8
JO - Frontiers in Veterinary Science
JF - Frontiers in Veterinary Science
SN - 2297-1769
M1 - 735345
ER -
ID: 279636746