The National Animal Health Laboratory Network (NAHLN) reports reports 50 positive accessions out of 691 tested at nine veterinary diagnostic labs for the week ending 27 September, according to the American Association of Swine Veterinarians (AASV).

The total number of states reporting one or more PED-positive cases remains 31.

US states with PEDv-positive swine accessions

Pig Farm Samples Testing Positive for PEDv: 8,506

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 8,506, which includes 50 for the most recent week.

For the current month to date, 2,965 accessions were tested, of which 241 samples or 8.1 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 33,727 farm samples have been tested, of which 22 per cent have tested positive for the virus.

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

Figure 2. PED-positive biological accessions in the US, by week
(since April 2013; data from NAHLN)

Results by age class

Suckling pigs

For the current month to date, 329 farms have been tested, of which 38 samples or 12 per cent were positive for PEDv.

Since testing was fully reported in November 2013, 4,603 farm samples have been tested, of which 1,853 samples or 36 per cent tested positive for PEDv.

Nursery pigs

For the current month to date, 399 farms have been tested, of which 31 samples or 7.8 per cent were positive for PEDv.

Since testing was fully reported in November 2013, 4,990 farm samples have been tested, of which 1,504 samples or 27 per cent tested positive for PEDv.

Grower/finisher pigs

For the current month to date, 542 farms have been tested, of which 33 samples or 6.1 per cent were positive for PEDv.

Since testing was fully reported in November 2013, 5,805 farm samples have been tested, of which 1,459 samples or 20 per cent tested positive for PEDv.

Sows and boars

For the current month to date, 290 farms have been tested, of which 11 samples or 3.8 per cent have tested positive for PEDv.

Since testing was fully reported in November 2013, 2,842 farm samples have been tested, of which 669 samples or 18 per cent tested positive for PEDv.

Unknown age class

For the current month to date, 1,539 farms have been tested, of which 132 samples or 8.6 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 16,735 farm samples have been tested, of which 3,234 samples or 19 per cent tested positive for PEDv.

Results by state

According to AASV, the total number of states with one or more positive results, according to the official report, still stands at 31.

The total number of positive accessions on this report (up to the week of 21 September) is 8,506, 50 more than the previous week.

Those states with 200 or more positive tests are: Iowa, 2,14; Minnesota, 1,410; Illinois, 957; North Carolina, 830; Oklahoma, 445; Indiana, 430; Ohio, 366; Missouri, 319; Kansas, 278, Michigan, 228 and Nebraska, 202.

For the most recent week (week of 21 September), the state reporting the most new positive tests was Iowa with 14, Missouri with nine and Illinois with eight.

Also reporting one or more positive results were Arizona, California, Kansas, Michigan, Minnesota, Montana, North Carolina, Nebraska, Oklahoma, South Dakota and Wyoming.

Pig Samples Testing Positive for PEDv: 32,565

The total number of swine samples (termed 'biological samples' in the official report) since testing began in June 2013 now stands at 32,565.

For the current month to date, 17,708 samples have been tested, of which 930 samples or 5.3 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 194,857 samples have been tested, of which 15 per cent tested positive for PEDv.

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

Environmental Samples Testing Positive for PEDv: 7,160

The total number of environmental samples testing positive since testing began in June 2013 now stands at 7,160.

For the current month to date, 1,757 samples have been tested, of which 132 samples or 7.5 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 34,656 samples have been tested, of which 19 per cent tested positive.

Figure 4. 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.

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