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Update on Swine Enteric Coronavirus Disease in US

20 March 2015

US - The number of pig farm samples that are confirmed positive for porcine epidemic diarrhoea virus (PEDV) in the last week was 58, two premises were confirmed with porcine deltacoronavirus (PDCoV) and one with the dual infection (PEDV and PDCoV).

For the latest week – 8 to 14 March – there were 58 new confirmed positive premises for PEDV and none presumed positive, according to the latest report from USDA APHIS made available by the American Association of Swine Veterinarians (AASV).

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

The total numbers of premises with confirmed positive status for the current week are 1,042, 47 and 44 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 1,106 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 53, 27 and five, respectively. For the dual infection, the totals are 46, 27 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 / 1 42 / 2 12 / 4 60 / 8 20 / 4 12 / 4
Jan-15 19 / 3 71 / 7 9 / 0 69 / 13 18 / 1 39 / 5
Feb-15 8 / 0 44 / 2 3 / 0 45 / 5 9 / 1 25 / 0
Total 132 / 48 318 / 59 54 / 25 358 / 110 195 / 93 148 / 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 2,978 461 15.5 1,799 49 2.7
Mar-15 to date 1,533 293 19.1 865 26 3.0
Total since Jun-14 29,215 3,692 12.6 14,521 371 2.6
Grand total 50,343 10,688 21.2 16,693 631 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 31 states with at least one confirmed positive case of PEDV. Georgia reported its first positive finding in the first week of March and has now reported six cases.

For the current week (8 March), there were 158 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 3,692. Iowa reported 54 of these new cases, North Carolina 31, Missouri 13 and Illinois 11.

Also reporting positive results in this most recent week were Indiana, Kansas, Michigan, Minnesota, Nebraska, Ohio, Oklahoma, 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 19 states with at least one confirmed positive case of PDCoV.

For the current week (8 March), there were 14 PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 368. There were four positive premises in Illinois, three each in Indiana and North Carolina, two in Michigan and one each in Iowa and Minnesota.

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 18 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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