That Britain's pig herds have been ill for many years comes as no surprise and is part of the explanation for the poor productivity per sow.
Irish productivity is very low too, although not quite as low as British figures - details here
This level of swine flu comes as a considerable shock.
Full Farmers Weekly report here.
Swine flu incidence higher than thought
Friday 19 October 2012 12:31
Nearly three-quarters of British pig herds are infected with swine flu, according to new findings.
Routine diagnostic blood testing in the UK and Ireland indicated that the incidence of the disease could be higher than expected, with more than 70% of British herds having one or more pigs test positive. This figure increased to more than 90% in Ireland....