As chlamydial abortion was reported in Flock A in the past, sheep could have been already serologically positive before vaccination and the very high antibody levels could represent an overlay of both abortion and vaccine-associated antibody values.
However, some outbreaks have been reported in correctly vaccinated flocks, so it is clear that new vaccines are necessary to address adequate protection and to avoid the shedding of the microorganism.
It has also been reported in a research flock in which detailed biosecurity measures have been maintained, founded with sheep from a country free of classical scrapie [ 10].
C, G151 and D172 polymorphisms are also expected to return the correct PRNP genotypes except when present in AHCQ, AHGQ, ARRD, ARQD, AHQD172 and VRQD172 alleles, of which only C151 has been reported in the UK flock (at a frequency of 0.002) [ 18].
This T allele has not been reported in studies of UK flocks [ 18], but has been detected in other countries [ 6].
This K allele has not been reported in studies of UK flocks [ 18], but has been detected in other countries [ 5].
Multiple outbreaks of the virus have been reported in poultry farms and wild flocks across Europe, Africa and Asia in the past six months.
So far, only sporadic cases of AR in small ruminant flocks have been reported in Norway [ 12].
Only sporadic cases of AR in small ruminant flocks have so far been reported in Norway [ 12].
Outbreaks among egg-laying chickens have also been reported in the mining area of Karnataka, India [ 18], and excessive losses from MD have recently been reported in adult laying flocks over the age of 40 weeks in Japan [ 19].
