The National Animal Health Laboratory Network (NAHLN) reports 142 positive accessions out of 749 tested at seven veterinary diagnostic labs for the week ending 31 May, according to the American Association of Swine Veterinarians (AASV).

The number of states reported to the NAHLN as having at least one confirmed case of PED remains at 30.

US states with PEDv-positive swine accessions

Pig Farm Samples Testing Positive for PEDv: 7,111

The total number of pig farm samples (termed 'laboratory biological accessions' in the official report) that have tested positive for the PED virus (PEDv) since April 2013 now stands at 7,111, which includes 756 for the month of May so far.

Since testing was fully reported in November 2013, 20,740 farm samples have been tested, of which 30 per cent have tested positive for the virus.

Figure 1. Number of pig farm samples positive for PEDv
(since April 2013; data from NAHLN)

Results by age class

Suckling pigs

For the current month to date, 568 farms have been tested, of which 199 samples or 35 per cent were positive for PEDv.

Since testing was fully reported in November 2013, 2,861 farm samples have been tested, of which 1,543 samples or 47 per cent tested positive for PEDv.

Nursery pigs

For the current month to date, 512 farms have been tested, of which 120 samples or 23 per cent were positive for PEDv.

Since testing was fully reported in November 2013, 3,283 farm samples have been tested, of which 1,289 samples or 35 per cent tested positive for PEDv.

Grower/finisher pigs

For the current month to date, 594 farms have been tested, of which 106 samples or 18 per cent were positive for PEDv.

Since testing was fully reported in November 2013, 3,666 farm samples have been tested, of which 1,295 samples or 27 per cent tested positive for PEDv.

Sows and boars

For the current month to date, 413 farms have been tested, of which 61 samples or 15 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 1,752 farm samples have been tested, of which 615 samples or 26 per cent tested positive for PEDv.

Unknown age class

For the current month to date, 1,655 farms have been tested, of which 300 samples or 18 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 9,927 farm samples have been tested, of which 2,551 samples or 25 per cent tested positive for PEDv.

Results by state

According to AASV, the total number of states affected remains at 30.

The total number of positive accessions on this report (up to the week of 25 May) is 7,111.

Those states with 100 or more positive tests are: Iowa, 2,066; Minnesota, 1,173; Illinois, 747; North Carolina, 706; Oklahoma, 396; Indiana, 382; Ohio, 322; Kansas, 264; Missouri, 196, Michigan, 175 and Nebraska, 139.

For the most recent week (week of 25 May), most of the new cases - 32 of the 142 new positive results - were in Iowa, followed by Illinois with 26 and Minnesota with 23.

Also reporting one or more positive results were Colorado, Indiana, Kansas, Michigan, Missouri, North Carolina, Nebraska, Ohio, Oklahoma, Pennsylvania, South Dakota and Texas.

Pig Samples Testing Positive for PEDv: 26,069

The total number of swine samples (termed 'biological samples' in the official report) since testing began in June 2013 now stands at 26,069.

For the current month to date, 26,359 samples have been tested, of which 3,923 or 15 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 105,141 samples have been tested, of which 22 per cent tested positive for PEDv.

Figure 2. Number of pig samples positive for PEDv
(since June 2013; data from NAHLN)

Environmental Samples Testing Positive for PEDv: 5,984

The total number of environmental samples testing positive since testing began in June 2013 now stands at 5,984.

For the current month to date, 4,519 samples have been tested, of which 882 or 20 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 22,377 samples have been tested, of which 24 per cent tested positive.

Figure 3. Number of environmental samples positive for PEDv
(since June 2013; data from NAHLN)

Critical notes about these data are provided at the end of the original report from AASV.

Further Reading You can find out more about PED by clicking here.