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PED-Positive Submissions: New Records Set; Virus Found in Arizona, Wyoming

06 February 2014

US - The total number of swine accessions and diagnostic case submissions testing positive for the Porcine Epidemic Diarrhoea (PED) virus now stands at 2,962, writes Jackie Linden. The increase in the number of these samples testing positive for the virus has set another new record for the latest week, and the first virus-positive environmental samples have been reported in Arizona and Wyoming.

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 26 January: suckling, 605 (+63); nursery, 578 (+54); grower/finisher, 801 (+37); sows/boars, 295 (+23) and 734 (+101) unknown. The total is up 265 from the previous week, easily another weekly record.

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, 1,095; Minnesota, 396; North Carolina, 367; Oklahoma, 290; Kansas, 171; Illinois, 158; Indiana, 108; Ohio, 97; Colorado, 43; Missouri, Texas and Pennsylvania, 36 and Michigan, 23.

For the most recent week, Iowa again leads the 'league table' in the number of new positive results, accounting for 87 of the total of 265 new cases, followed by Minnesota with 50 and Illinois with 38.

Of the new cases attributed to a production phase, 63 were in suckling piglets, 54 in nurseries, 37 in grower/finishers, 23 in sows and boars and 101 were classified as "unknown".

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 26 January, the total number of biological (swine) samples testing positive is 9,386 - up 829 from the previous week and yet another record-breaking weekly increase. The most-affected states by this measure are: North Carolina, 2,468; Iowa, 2,138; Oklahoma, 1,082; Minnesota, 908; Kansas, 732; Illinois, 749; Ohio, 310; Missouri, 177; Colorado, 159; Texas, 122; Indiana, 146 and Pennsylvania, 102. Other states, where positive, reported 100 positives or fewer.

In the most recent week reported (week of 26 January), the following states reported one or more positive results: Colorado (17), Iowa (219), Illinois (140), Indiana (41), Kansas (6), Kentucky (2), Michigan (5), Minnesota (84), Missouri (31), North Carolina (137), Nebraska (46), Ohio (42), Oklahoma (24), Pennsylvania (10), South Dakota (4), Texas (4), Wisconsin (1) and Wyoming (6).

The total number of environmental samples testing positive for PEDv has been reported weekly since the week of 16 June. The total has reached 2,009, which is 148 more than the previous week's figure. The totals for each state are as follows (with the increase in brackets: Arizona, 3 (+3); Colorado, 21 (=); Iowa, 262 (+17); Illinois, 64 (+1); Indiana, 10 (+5); Kansas, 214 (+7); Kentucky, 7 (+5); Michigan 1 (=), Minnesota, 662 (+48); Missouri, 80 (=); North Carolina, 125 (+3); Nebraska, 11 (=); New York 1 (=); Ohio, 100 (+19); Oklahoma 317 (+25); Pennsylvania, 11 (=); South Dakota, 11 (+1); Tennessee, 21 (+3); Texas, 24 (=); Virginia, 2 (=); Wyoming 10 (+10) and unknown, 52 (+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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