For the latest weekly report - for the week of 19 April in a report dated 23 April from the American Association of Swine Veterinarians (AASV) - 31 swine accessions have tested positive for the SDCv, bringing the cumulative total to 87.

The National Animal Health Laboratory Network (NAHLN) began collating testing data on SDCv for the week of 30 March 2014. So far, 638 accessions have been tested, 220 in the most recent week reported, so the percentage found positive is 14 per cent.

Twelve states have so far reported positive accessions, with Nebraska and North Carolina reporting their first positive cases in the last week.

With the number of positive results, affected states are: Iowa, 12; Illinois, 14; Indiana, 12; Michigan, 7; Minnesota, 18; North Carolina, 1; Nebraska, 1; Pennsylvania, 1; South Dakota, 14; Texas, 2 and unknown, 2.

SDCv is a similar type of virus to the one that causes Porcine Epidemic Diarrhoea (PED).

Figure 1. SDCv-positive biological accessions (pig farms)