As of Dec. 8, the total number of accessions and diagnostic case submissions testing positive for porcine epidemic diarrhea virus was at 1,645. New York has reported its first positive environmental sample since June.

Between April 15 and Dec. 8, 355 PED-positive samples were submitted from the suckling phase, 311 from the nursery phase, 515 from the grower/finisher phase, 208 from sow/boars and 270 from unknown phases. One hundred and thirty-two new cases tested positive from the previous total.

No states have reported their first positive results in the past week, so the total number of states affected remains at 20. The following states all have 10 or more positive PED tests: Iowa, 559; Oklahoma, 262; North Carolina, 258; Minnesota, 153; Kansas, 131; Indiana, 52; Ohio, 47; Colorado, 34; Illinois, 34; Pennsylvania, 27; and Texas, 23.

Iowa leads in the number of new positive results, accounting for 65 of the total of 132 new cases, followed by Minnesota with 18 and North Carolina with 12.

From June 16 to Dec. 8, the total number of biological samples testing positive was 5,137, up from 4,694 the previous week, an increase of 445.

The states most affected by this are North Carolina, 1,474; Iowa, 969; Oklahoma, 964; Kansas, 605; Minnesota, 379; Ohio, 169; Illinois, 130; Colorado, 111; Pennsylvania, 80; Texas, 74; and Indiana, 67. Fifty or fewer positive samples were reported by other states.

In the week of Dec. 8, the following states reported one or more positive results: North Carolina, 167; Iowa, 126; Minnesota, 33; Illinois, 27; Oklahoma, 25; Missouri, 20; Kansas, 13; Indiana, eight; Ohio, six; Texas, four; Michigan, two; and Pennsylvania, one.

The total number of environmental samples testing positive for PED has reached 1,215, which is 65 more than the previous week.

The last half of December continues to have many new cases. This is not surprising as the virus survives well below freezing and the number of contaminated trailers is increasing as the epidemic spreads.

I continue to be perplexed at the introduction into some populations as the virus is not always entering herds that we consider high risk and, at the same time, is entering herds that we consider low risk.

The procedures for individual herd containment are available from your herd veterinarian.

We continue to refine these as research and experience accumulates. The industry is committed to procedures that will ascertain a herd has successfully eliminated PEDV.