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PED-Positive Submissions: First Detection on South Dakota Pig Farm Since June

05 December 2013

US - The total number of swine accessions and diagnostic case submissions testing positive for the Porcine Epidemic Diarrhoea (PED) virus now stands at 1,373, writes Jackie Linden. The rate of increase has again accelerated, and the virus has been detected for the first time on a pig farm in South Dakota since the reporting system was adjusted in June this year.

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 24 November: suckling, 304 (+21); nursery, 249 (+23); grower/finisher, 443 (+15); sows/boars, 188 (+3) and 199 (+34) unknown. The total is up 96 from the previous week.

No states have reported a first positive result in the last week and so the total affected remains at 19. Those states with 10 or more positive tests are: Iowa, 428; Oklahoma, 249; North Carolina, 238; Kansas, 122; Minnesota, 113; Indiana, 36; Ohio, 39; Colorado, 32; Pennsylvania, 23; Texas, 20 and Illinois, 16.

For the most recent week, Iowa again leads the 'league table' in the number of new positive results, accounting for 25 of the total of 96 new cases, followed by Minnesota and North Carolina, with 19 each.

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 24 November, the total number of biological (swine) samples testing positive is 4,331, up from 3,921 the previous week (+412). The most-affected states by this measure are: North Carolina, 1,260; Oklahoma, 909; Iowa, 703; Kansas, 584; Minnesota, 290; Colorado, 106; Ohio, 154; Pennsylvania, 76; Texas, 66; Illinois, 64 and Indiana, 43. Other states, where positive, reported 20 positives or fewer.

In the most recent week reported (week of 24 November), the following states reported one or more positive results: Colorado (7), Iowa (49), Indiana (5), Kansas (1), Kentucky (2), Minnesota (63), North Carolina (164), Ohio (56), Oklahoma (48), Pennsylvania (5), South Dakota (1), Texas (13) and Wisconsin (3). This was the first positive result in South Dakota since June; one positive result was found in late May under the previous reporting system.

The total number of environmental samples testing positive for PEDv has been reported weekly since the week of 16 June. The total has reached 973, which is 69 more than the previous week's figure. The totals for each state are as follows (with the increase in brackets: Colorado, 18 (+4); Iowa, 102 (+10); Illinois, 25 (+1); Kansas, 148 (+1); Minnesota, 282 (+41); Missouri, 15 (+1); North Carolina, 50 (+2); Nebraska, 4 (+2); Ohio, 31 (+5); Oklahoma 237 (+2); Pennsylvania, 4 (=); South Dakota, 1 (=); Tennessee, 3 (=); Virginia, 2 (=); unknown, 50 (=).

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 20 November.

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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