The National Animal Health Laboratory Network (NAHLN) reports reports 98 positive accessions out of 795 tested at 11 veterinary diagnostic labs for the week ending 21 June 2014, according to the American Association of Swine Veterinarians (AASV).

Last week's report incorrectly identified Arkansas as the latest state to report an initial case of PEDv. NAHLN has corrected that report this week. The number of states reported to the NAHLN as having at least one confirmed case of PED reverts back to 30.

US states with PEDv-positive swine accessions

Pig Farm Samples Testing Positive for PEDv: 7,447

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 7,447, which includes 335 for the month of June so far.

Since testing was fully reported in November 2013, 23,083 farm samples have been tested, of which 28 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, 383 farms have been tested, of which 81 samples or 21 per cent were positive for PEDv.Since testing was fully reported in November 2013, 3,244 farm samples have been tested, of which 1,624 samples or 44 per cent tested positive for PEDv.

Nursery pigs

For the current month to date, 296 farms have been tested, of which 52 samples or 18 per cent were positive for PEDv.

Since testing was fully reported in November 2013, 3,578 farm samples have been tested, of which 1,340 samples or 33 per cent tested positive for PEDv.

Grower/finisher pigs

For the current month to date, 372 farms have been tested, of which 42 samples or 11 per cent were positive for PEDv.

Since testing was fully reported in November 2013, 4,039 farm samples have been tested, of which 1,338 samples or 25 per cent tested positive for PEDv.

Sows and boars

For the current month to date, 253 farms have been tested, of which 15 samples or six per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 2,005 farm samples have been tested, of which 630 samples or 23 per cent tested positive for PEDv.

Unknown age class

For the current month to date, 1,108 farms have been tested, of which 150 samples or 14 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 11,043 farm samples have been tested, of which 2,702 samples or 23 per cent tested positive for PEDv.

Results by state

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

The total number of positive accessions on this report (up to the week of 15 June) is 7,447.

Those states with 100 or more positive tests are: Iowa, 2,115; Minnesota, 1,239; Illinois, 793; North Carolina, 742; Oklahoma, 407; Indiana, 398; Ohio, 330; Kansas, 268; Missouri, 229, Michigan, 196; Nebraska, 157 and South Dakota, 102.

For the most recent week (week of 15 June), most of the new cases - 16 of the 98 new positive results - were in Illinois and Minnesota, followed by Iowa with 15.

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

Pig Samples Testing Positive for PEDv: 27,827

The total number of swine samples (termed 'biological samples' in the official report) since testing began in June 2013 now stands at 27,827.

For the current month to date, 17,923 samples have been tested, of which 1,756 or 10 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 123,168 samples have been tested, of which 20 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: 6,371

The total number of environmental samples testing positive since testing began in June 2013 now stands at 6,371.

For the current month to date, 3,163 samples have been tested, of which 387 or 12 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 25,546 samples have been tested, of which 23 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.