An example is described in Doran et al. (46), where a 7-year-old cow with tuberculous mastitis milked to feed calves resulted in 25 of 28 calves, born over two seasons, being identified as bTB reactors.

Tuberculosis testing of the entire herd (all adult cattle and all calves down to 1 day of age) was carried out using the caudal fold test method. There were 80 suspects out of 451 cattle tested (18% reactor …

Oct 27, 2025 · If an inconclusive reactor (IR), direct contact (DC) or reactor dies or has to be slaughtered on your farm for welfare reasons, inform APHA immediately – a 24-hour contact service is available.

Calves born to reactor animals are not considered to be at significantly increased risk of TB infection, especially if removed promptly from the dam. Such calves will usually remain on farm,...

Gross tubercle lesions in the lung lobes of a three‐week‐old SICCT reactor calf born from a 10‐year‐old cow (A).

Animals that have an inconclusive skin test result at two consecutive tests (known as 2xIRs) are also classified as reactors. Any reactors found during a skin test are marked immediately using a DNA tag …

Nov 10, 2022 · These calves started out in individual hutches, but after 3-6 weeks are raised in group pens. The aerosol route of infection is believed to be responsible or 80–90% of all tuberculosis …

Sep 23, 2022 · An example is described in Doran et al. (46), where a 7-year-old cow with tuberculous mastitis milked to feed calves resulted in 25 of 28 calves, born over two seasons, being identified as …

Vaccination as the sole means of disease control has been effective. Reduction in the number of reactors in a herd is directly related to the percentage of vaccinated animals. However, when …

ages of reactors to CCT test in calves were 10.92%. In CCT test the reactors were 6.56% for bovine tuberculosis, .0546% for avian.