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Update on Swine Enteric Coronavirus Disease in US

13 March 2015

US - The number of pig farm samples that are confirmed positive for porcine epidemic diarrhoea virus (PEDV) in the last week was 31, three premises were confirmed with porcine deltacoronavirus (PDCoV) and one with the dual infection (PEDV and PDCoV).

For the latest week – 1 to 7 March – there were 31 new confirmed positive premises for PEDV and nine presumed positive, according to the latest report from USDA APHIS.

For the same period, three premises were confirmed positive for PDCoV but one was presumed positive, and there were also one 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 985, 45 and 43 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 1,048 confirmed positive premises, 416 presumed positive and 52 previously positive premises that have attained negative status.

For PDCoV, the total for the same period are 51, 27 and five, respectively. For the dual infection, the totals are 45, 27 and two, 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 / 1 42 / 2 12 / 4 60 / 8 20 / 4 12 / 4
Jan-15 19 / 3 66 / 7 7 / 0 63 / 13 17 / 1 36 / 5
Feb-15 8 / 0 38 / 2 3 / 0 41 / 5 9 / 1 8 / 0
Total 131 / 48 299 / 59 51 / 25 346/ 110 193 / 93 124 / 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 3,089 500 16.2 1,845 44 2.4
Feb-15 2,977 461 15.5 1,786 49 2.7
Mar-15 to date 725 135 18.6 414 129 2.9
Total since Jun-14 28,406 3,534 12.4 14,036 355 2.5
Grand total 49,534 10,510 21.2 16,208 615 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. Georgia reported its fist positive finding in the first week of March but it has not yet appeared in this APHIS report.

For the current week (1 March), there were 130 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 3,527. Iowa reported 43 of these new cases, North Carolina 26 and Missouri 11.

Also reporting positive results in this most recent week were Illinois, Indiana, Kansas, Michigan, Minnesota, Nebraska, Ohio, Oklahoma, Pennsylvania, South Dakota, Texas, Utah, Wisconsin and "unknown".

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

PDCoV

There are currently 19 states with at least one confirmed positive case of PDCoV.

For the current week (1 March), there were 12 PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 351. There were three positive premises in Illinois, two each in Iowa, Minnesota and North Carolina and one each in Michigan, Oklahoma and South Dakota.

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 14 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 17 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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