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Update on Swine Enteric Coronavirus Disease in US

22 December 2014

US - The number of pig farm samples that are confirmed positive for porcine epidemic diarrhoea virus (PEDV) in the last week was 23, and there was one premises with dual infection of PEDV and porcine deltacoronavirus (PDCoV).

For the latest week – 7 to 14 December 2014 – there were 23 new confirmed positive premises for PEDV and six presumed positive.

For the same period, no premises were confirmed for PDCoV and one presumed positive.

There was one confirmed premise with a dual infection (both PEDV and PDCoV).

The total numbers of confirmed positive premises for the latest week were 573, 25 and 21 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 591 confirmed positive premises, 350 presumed positive and 14 previously positive premises that have attained negative status.

For PDCoV, the total for the same period are 27, 26 and two, respectively. For the dual infection, the totals are 21, 26 and one, respectively.

Table 1. Number of SECD confirmed and presumptive positive premises by month and production class
(includes PEDV, PDCoV and dual infections; confirmed/presumptive)
MonthNurseryWean to finishFarrow to finishFinisherSow/breedingUnknown
Jun-14 17 / 10 29 / 16 14 / 8 22 / 29 46 / 43 14 / 51
Jul-14 25 / 9 36 / 7 6 / 5 20 / 12 32 / 11 16 / 33
Aug-14 15 / 8 17 / 6 2 / 5 25 / 10 10 / 6 10 / 22
Sep-14 17 / 6 21 / 7 2 / 2 30 / 8 29 / 6 6 / 12
Oct-14 1 / 4 24 / 5 2 / 0 33 / 15 6 / 2 12 / 8
Nov-14 5 / 1 8 / 3 1 / - 39 / 5 11 / 8 19 / 8
Dec-14 - / 3 1 / 2 - / - 4 / 1 2 / 4 3 / 3
Missing - / 3 1 / 2 - / - 1 / 1 1 / 4 - / 3
Total 82 / 38 137 / 44 28 / 20 174 / 80 140 / 81 78 / 139

 

Table 2. Biological accessions tested and number positive by month
(since 5 June 2014)
 PEDVPDCoV
MonthTestedPositive% positiveTestedPositive% positive
Total before 5 June 2014 21,228 6,976 29.4 2,172 260 12.0
Jun-14 2,768 407 14.7 824 80 9.7
Jul-14 3,555 410 11.5 1,195 46 3.8
Aug-14 3,095.0 312 10.1 1,193 18 1.5
Sep-14 3,143 261 8.3 1,338 11 0.8
Oct-14 3,304 299 9.0 1,899 19 1.0
Nov-14 2,506 305 12.1 1,556 30 1.9
Dec-14 to date 1,582 223 14.1 947 16 1.7
Total since Jun-14 19,954 2,217 11.1 8,953 220 2.5
Grand total 41,082 9,193 22.4 11,125 480 4.3
5m Publishing
Figure 1. PED-positive biological accessions in the US, by week (since 5 June 2014)
5m Publishing
Figure 2. PDCoV-positive biological accessions in the US, by week (since 5 June 2014)

Location of Positive Premises

PEDV

There are currently 33 states with at least one confirmed positive case of PEDV, following the addition of Hawaii in mid-November 2014.

For the current week (7 December), there were 111 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 2,217. Minnesota reported 19 of these new cases and Iowa, 15.

Also reporting positive results in this most recent week were California, Colorado, Illinois, Indiana, Kansas, Kentucky, Michigan, Missouri, North Carolina, Nebraska, New York, Oklahoma, Texas, Utah and Wisconsin.

USDA APHIS
Figure 3. PEDV: Cumulative confirmed and presumptive PEDV-positive premises since 5 June 2014

PDCoV

There are currently 17 states with at least one confirmed positive case of PDCoV.

For the current week (7 December), there were 11 PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 220. There were six positive premises in Minnesota, three in Iowa and one each in Illinois and in the category "unknown".

USDA APHIS
Figure 4. PDCoV: Cumulative confirmed and presumptive PDCoV-positive premises since 5 June 2014

Dual infection with PEDV and PDCoV

There are currently 13 states with one or more confirmed positive cases of the dual infection with both PEDV and PDCoV.

USDA APHIS
Figure 5. Dual infection: Cumulative confirmed and presumptive positive premises with both PEDV and PDCoV since 5 June 2014

Critical notes about these data are provided at the end of the original report.

Further Reading

Find out more information on PED virus by clicking here
For more information on PDCoV by clicking here.

ThePigSite News Desk

Top image via Shutterstock



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