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PED-Positive Submissions: Another Jump in Positive Case Count

12 November 2013

US - The total number of swine accessions and diagnostic case submissions testing positive for the Porcine Epidemic Diarrhoea (PED) virus is now 979, writes Jackie Linden. The rate of increase in positive results continues to rise each week and another state - the 19th - has reported its first case.

By farm class, this figure for the total number of positive laboratory swine accessions/diagnostic case submissions breaks down as follows between the weeks of 15 April and 27 October: suckling, 216 (+23); nursery, 150 (+16); grower/finisher, 325 (+28); sows/boars, 168 (+17) and 117 (+5) unknown. The total is up 85 from the previous week.

Maryland has reported its first positive result in the last week and so the total affected now stands at 19. Those states with 10 or more positive tests are: Iowa, 266; Oklahoma, 211; North Carolina, 176; Kansas, 109; Minnesota, 62; Colorado, 29; Indiana, 28; Pennsylvania, 20; Ohio, 17 and Illinois, 10.

For the week of 20 to 27 October, Iowa leads the "league table" in the number of new positive results, accounting for 33 of the total of 85 new cases, with North Carolina and Oklahoma reporting 17 and 13, respectively. Across all the states, the new positive findings were mainly in the grower/finisher and suckling categories, with most of these new results in Iowa with 14 out of 28 and 10 out of 23 new cases in these two 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 PEDv. Since 16 June, the data refer only to diagnostic cases submissions ('swine accessions').

From the week of 16 June to week of 27 October, the total number of biological (swine) samples testing positive is 2,949, up from 2,620 the previous week (+329). The most-affected states are: North Carolina, 874; Oklahoma, 728; Kansas, 523; Iowa, 331; Minnesota, 145; Colorado, 82; Ohio, 72; Illinois, 51; Pennsylvania, 49 and Indiana, 30. Other states, where positive, reported 20 positives or fewer.

In the most recent week reported (week of 27 October), the following states reported one or more positive results: Iowa (82), Illinois (23), Indiana (1), Kansas (6), Maryland (1), Minnesota (9), North Carolina (127), Iowa (1), Oklahoma (65), Pennsylvania (1), Tennessee (5), Texas (7) 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 582, which is 21 more than the previous week's figure. The totals for each state are as follows (with the increase in brackets: Colorado, 14 (=); Iowa, 44 (+2); Kansas, 74 (+5); Minnesota, 186 (=); Missouri, 1 (=); North Carolina, 20 (=); Ohio, 16 (+5); Oklahoma 171 (+7); Pennsylvania, 4 (+2); South Dakota, 1 (=); Virginia, 2 (=); unknown, 49(=).

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 6 November.

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

Cumulative number of swine samples testing positive for PEDv in the US.
(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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