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Update on Swine Enteric Coronavirus Disease in US

09 March 2015

US - The number of pig farm samples that are confirmed positive for porcine epidemic diarrhoea virus (PEDV) in the last week was 78, five premises were confirmed with porcine deltacoronavirus (PDCoV) and 11 with the dual infection (PEDV and PDCoV).

For the latest week – 22 to 28 February 2015 – there were 78 new confirmed positive premises for PEDV and nine presumed positive, according to the latest report from USDA APHIS made available by the American Association of Swine Veterinarians (AASV).

For the same period, five premises was confirmed positive for PDCoV but none was presumed positive, and there were also 11 confirmed dual infection (both PEDV and PDCoV) and none presumed positive.

The total numbers of premises with confirmed positive status for the current week are 969, 42 and 44 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 1,015 confirmed positive premises, 407 presumed positive and 36 previously positive premises that have attained negative status.

For PDCoV, the total for the same period are 48, 26 and five, respectively. For the dual infection, the totals are 44, 26 and one, respectively.

Table 1. Number of swine enteric coronavirus disease (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 39 / 2 12 / 3 60 / 6 19 / 4 12 / 4
Jan-15 19 / 2 63 / 52 7 / 0 58 / 11 17 / 1 37 / 5
Feb-15 to date 3 / 0 28 / 2 2 / 0 33 / 3 7 / 1 8 / 0
Total 124 / 46 283 / 57 49 / 24 330/ 103 187 / 91 124 / 134

 

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 3,089 500 16.2 1,845 44 2.4
Feb-15 to date 2,975 461 15.5 1,783 49 2.7
Total since Jun-14 27,679 3,400 12.3 13,619 343 2.5
Grand total 48,807 10,376 21.3 15,791 603 3.8
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.

For the current week (22 February), there were 117 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 3,396. Iowa reported 38 of these new cases, North Carolina 28, Missouri 13 and Illinois 11.

Also reporting positive results in this most recent week were Indiana, Kansas, Michigan, Minnesota, Nebraska, New York, Oklahoma, Pennsylvania, South Dakota, Texas, Utah 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 (22 February), there were eight PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 339. There were two positive premises each In Iowa and Illinois and one each in Michigan, Ohio, Oklahoma and Texas.

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, with 16 and nine confirmed positive results, respectively. 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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