Is the transmission of Mycobacterium avium subspecies paratuberculosis (MAP) infection through milk intended to feed calves an overlooked item in paratuberculosis control programs?
Autor: | P. Steuer, Miguel Salgado, Juan P. Soto, Bernardita Collado, Carlos Tejeda, C Avilez |
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Rok vydání: | 2019 |
Předmět: |
Veterinary medicine
Cattle Diseases Paratuberculosis Enzyme-Linked Immunosorbent Assay law.invention Feces Food Animals Seroepidemiologic Studies law medicine Animals Seroprevalence Serologic Tests Chile Antigens Bacterial biology Potential risk biology.organism_classification medicine.disease Mycobacterium avium subspecies paratuberculosis Mycobacterium avium subsp. paratuberculosis Milk Transmission (mechanics) Young stock Herd Positive culture Cattle Female Animal Science and Zoology Disease Susceptibility |
Zdroj: | Tropical Animal Health and Production. 52:89-94 |
ISSN: | 1573-7438 0049-4747 |
Popis: | As in many parts of the world, Chile shows a high Mycobacterium avium subsp. paratuberculosis (MAP) infection rate. Evidently, the control recommendations have been inefficient. In the author’s opinion, the potential risk of MAP transmission to susceptible calves through milk consumption is largely overlooked. Two observational studies were performed, one to confirm MAP shedding in young stock in a high MAP-infected dairy herd and MAP load in milk intended to feed these calves was estimated. In parallel, in a second study, we estimated the relationship between MAP herd seroprevalence and the cow MAP shedding level as well as the presence of this pathogen in milk used to feed dairy calves. In the first study, 53.7% of cows and 22.5% of calves showed positive culture results. Among all cows tested, 9 (2.19%) animals had a positive serum ELISA, and MAP load in milk reached 106 bacteria/mL. In the second study, three seroprevalence categories were established as follows: high (≥ 9%), medium (> 5% and ≤ 9%), and low (≤ 5%). Statistical significant differences among these categories were observed. Animals from the high seroprevalence category shed significantly more MAP than the others. However, in the low category, heavy shedder animals were also observed. Finally, in all study herds, MAP presence in milk intended to feed calves was reported, even from herds without ELISA-positive animals. |
Databáze: | OpenAIRE |
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