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Update on Swine Enteric Coronavirus Disease in US

20 February 2015

US - The number of pig farm samples that are confirmed positive for porcine epidemic diarrhoea virus (PEDV) in the last week was 55, two premises were confirmed with porcine deltacoronavirus (PDCoV) and five with the dual infection (PEDV and PDCoV).

For the latest week – 8 to 14 February 2015 – there were 55 new confirmed positive premises for PEDV and four presumed positive, according to the latest report from USDA APHIS.

For the same period, two premises were confirmed positive for PDCoV but none was presumed positive, and there were five confirmed dual infection (both PEDV and PDCoV) and one presumed positive.

The total numbers of premises with confirmed positive status for the current week are 887, 37 and 32 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 913 confirmed positive premises, 397 presumed positive and 24 previously positive premises that have attained negative status.

For PDCoV, the total for the same period are 43, 26 and five, respectively. For the dual infection, the totals are 32, 27 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
finish
Farrow to
finish
FinisherSow/
breeding
Un-
known
Jun-14 18 / 11 30 / 16 15 / 8 22 / 28 47 / 45 14 / 52
Jul-14 25 / 12 36 / 8 6 / 5 20 / 13 33 / 12 15 / 33
Aug-14 15 / 8 17 / 6 2 / 5 25 / 10 10 / 6 10 / 22
Sep-14 17 / 3 21 / 5 2 / 2 30 / 8 31 / 7 6 / 14
Oct-14 2 / 4 24 / 5 2 / 0 33 / 15 6 / 2 11 / 8
Nov-14 6 / 1 15 / 3 1 / - 40 / 6 11 / 8 20 / 8
Dec-14 16 / 0 36 / 2 12 / 3 59 / 6 19 / 4 13 / 4
Jan-15 16 / 1 47 / 4 6 / 0 42 / 8 7 / 1 32 / 5
Feb-15 to date 0 / 0 8 / 1 0 / 0 5 / 1 3 / 0 1 / 0
Total 116 / 43 241 / 55 46 / 24 288/ 98 177 / 90 113 / 135

 

Table 2. Biological accessions tested and number positive by month
(since 5 June 2014)
 PEDVPDCoV
MonthTestedPositive% positiveTestedPositive% positive
Total before 5 June 2014 21,128 6,976 33.0 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 3,095 312 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 2,505 305 12.2 1,555 30 1.9
Dec-14 3,237 446 13.8 1,982 50 2.5
Jan-15 3,085 498 16.1 1,845 44 2.4
Feb-15 to date 1,470 217 14.8 871 23 2.6
Total since Jun-14 26,170 3,154 12.1 12,703 317 2.5
Grand total 47,298 10,130 21.4 14,875 577 3.9
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 34 states with at least one confirmed positive case of PEDV. Most recent was Virginia, which reported its first positive result in January 2015.

For the current week (8 February), there were 104 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 3,153. Iowa reported 37 of these new cases, North Carolina 19 and Illinois 13.

Also reporting positive results in this most recent week were California, Colorado, Indiana, Kansas, Kentucky, Michigan, Minnesota, Nebraska, Oklahoma, Pennsylvania, South Dakota, Texas, Wyoming and "unknown".

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 (2 February), there were 12 PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 316. There were four positive premises in Iowa, two each in Indiana, Michigan and "unknown" and one each in North Carolina and Ohio.

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.

Most-affected states with the dual infection are Iowa and Minnesota, each with nine confirmed positive results. APHIS has not updated the table giving the location of the new positive results this week.

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



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