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PED-Positive Submissions: Highest Environmental Sample Increase So Far

23 January 2014

US - The total number of swine accessions and diagnostic case submissions testing positive for the Porcine Epidemic Diarrhoea (PED) virus now stands at 2,394, writes Jackie Linden.

By farm class, this figure for the total number of positive laboratory swine accessions/diagnostic case submissions as follows between the weeks of 15 April and 12 January: suckling, 486 (+18); nursery, 472 (+24); grower/finisher, 690 (+19); sows/boars, 257 (+10) and 533 (+62) unknown. The total is up 122 from the previous week.

No states have reported a first positive test results in the last week and so the total number of states remains at 23. Those states with 20 or more positive tests are: Iowa, 882; North Carolina, 319; Minnesota, 294; Oklahoma, 284; Kansas, 159; Illinois, 92; Ohio, 74; Indiana, 73; Colorado, 39; Texas, 33 and Pennsylvania, 30.

For the most recent week, Minnesota leads the 'league table' in the number of new positive results, accounting for 30 of the total of 122 new cases, followed by Iowa with 29 and Illinois with 10.

As last week, there is a high proportion (62 of the total of 122) of the positive results in the most recent week (12 January) of "unknown" origin in terms of the phase of production; 10 were in sows/boars, and a further 18, 24 and 19 cases in the "suckling", "nursery" and "grow-finish" categories, respectively.

In mid-June, the reporting system was adjusted. For the weeks prior to 16 June, laboratories were able to provide diagnostic case submissions as well as the number of premises testing positive for the PED virus (PEDv). Since 16 June, the data refer only to diagnostic cases submissions ('swine accessions').

From the week of 16 June to that of 12 January, the total number of biological (swine) samples testing positive is 7,775 - up 597 from the previous week and another record increase. The most-affected states by this measure are: North Carolina, 2,103; Iowa, 1,761; Oklahoma, 1,042; Minnesota, 720; Kansas, 686; Illinois, 521; Ohio, 235; Colorado, 127, Missouri, 115, Texas, 109; Indiana, 92 and Pennsylvania, 90. Other states, where positive, reported 50 positives or fewer.

In the most recent week reported (week of 12 January), the following states reported one or more positive results: California (1), Colorado (8), Iowa (181), Illinois (81), Indiana (5), Kansas (12), Kentucky (9), Michigan (11), Minnesota (68), Missouri (9), North Carolina (145), Nebraska (14), Ohio (17), Oklahoma (18), Pennsylvania (6), South Dakota (2), Texas (9) and Wisconsin (1).

The total number of environmental samples testing positive for PEDv has been reported weekly since the week of 16 June. The total has reached 1,738, which is 230 more than the previous week's figure and another record increase. The totals for each state are as follows (with the increase in brackets: Colorado, 19 (=); Iowa, 240 (+24); Illinois, 63 (+3); Indiana, 1 (=); Kansas, 193 (=); Michigan 1 (=), Minnesota, 571 (+108); Missouri, 80 (+37); North Carolina, 107 (+2); Nebraska, 9 (=); New York 1 (=); Ohio, 60 (+13); Oklahoma 279 (+11); Pennsylvania, 11 (+2); South Dakota, 8 (+4); Tennessee, 18 (+10); Texas, 24 (+12); Virginia, 2 (=); unknown, 49 (-1).

These data are collated by USDA APHIS VS NVSL National Animal Health Laboratory Network (NAHLN) and cited by the American Association of Swine Veterinarians (AASV) in a report dated 22 January 2014.


Total number of swine samples testing positive for PEDv per week.
(Laboratories began reporting number of samples the week of 16 June 2013)

Cumulative number of swine samples testing positive for PEDv.
(Laboratories began reporting number of samples the week of 16 June 2013)

Further Reading

Find out more information on PED by clicking here.

Jackie Linden

Jackie Linden



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