PED-Positive Submissions: Two Milestones Passed as Positive Cases Rise Again

15 November 2013, at 11:11pm

US - The total number of swine accessions and diagnostic case submissions testing positive for the Porcine Epidemic Diarrhoea (PED) virus has exceeded 1,000 in the last week and now stands at 1,069, writes Jackie Linden. There is no real sign of a decline in the rate of increase yet.

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 3 November: suckling, 233 (+17); nursery, 178 (+28); grower/finisher, 353 (+28); sows/boars, 175 (+7) and 132 (+12) unknown. The total is up 90 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, 304; Oklahoma, 221; North Carolina, 190; Kansas, 115; Minnesota, 69; Colorado and Indiana, 29; Ohio, 22; Pennsylvania, 21; and Illinois, 11.

For the week of 3 to 9 November, Iowa again leads the 'league table' in the number of new positive results, accounting for 38 of the total of 90 new cases, with North Carolina and Oklahoma reporting 14 and 10, respectively. Across all the states, the new positive findings were mainly in the nursery and grower/finisher categories, with most of these new results in Iowa with 13 out of 28 and 17 out of 28 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 3 November, the total number of biological (swine) samples testing positive is 3,241, up from 2,949 the previous week (+392). The most-affected states are: North Carolina, 922; Oklahoma, 788; Kansas, 550; Iowa, 442; Minnesota, 163; Colorado, 82; Ohio, 81; Illinois, 54; Pennsylvania, 50; Indiana, 32 and Texas, 22. Other states, where positive, reported 20 positives or fewer.

In the most recent week reported (week of 3 November), the following states reported one or more positive results: Iowa (111), Illinois (3), Indiana (2), Kansas (27), Michigan (3), Minnesota (18), Missouri (3), North Carolina (48), Ohio (9), Oklahoma (60), Pennsylvania (1), Tennessee (2), Texas (3) and Wisconsin (2).

The total number of environmental samples testing positive for PEDv has been reported weekly since the week of 16 June. The total has reached 684, which is a large jump of 102 more than the previous week's figure. The totals for each state are as follows (with the increase in brackets: Colorado, 14 (=); Iowa, 53 (+9); Illinois, 24 (+24; first positive results); Kansas, 119 (+45); Minnesota, 188 (+2); Missouri, 8 (+7); North Carolina, 20 (=); Ohio, 19 (+3); Oklahoma 183 (+12); Pennsylvania, 4 (=); 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 13 November.

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

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

Further Reading

Find out more information on PED by clicking here.