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Update on Swine Enteric Coronavirus Disease in US

30 March 2015

US - The number of pig farm samples that are confirmed positive for porcine epidemic diarrhoea virus (PEDV) in the last week was 17, no premises were confirmed with porcine deltacoronavirus (PDCoV) but one had the dual infection (PEDV and PDCoV).

For the latest week – 15 to 21 March – there were 17 new confirmed positive premises for PEDV and none presumed positive, according to the latest report from USDA Animal and Plant Health Inspection Service (APHIS).

For the same period, no premises were confirmed or presumed positive for PDCoV, and there was 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 1,059, 47 and 45 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 1,123 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 47, 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 40 / 5
Feb-15 10 / 0 45 / 2 5 / 0 45 / 5 9 / 1 27 / 0
Mar-15 to date 1 / 0 10 / 0 1 / 0 4 / 0 0 / 0 7 / 0
Total 135 / 48 326 / 59 56 / 25 362 / 110 195 / 93 149 / 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 2,287 418 18.3 1,299 41 3.2
Total since Jun-14 29,969 3,817 12.7 14,955 386 2.6
Grand total 51,097 10,793 21.1 17,127 646 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.

For the current week (15 March), there were 122 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 3,816. North Carolina reported 35 of these new cases, Iowa 33 and Illinois 12.

Also reporting positive results in this most recent week were Idaho, Indiana, Michigan, Minnesota, Missouri, Nebraska, Oklahoma, Pennsylvania, South Dakota, Texas, Virginia, Wyoming 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 (15 March), there were 15 PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 383. There were two positive premises in Iowa, Illinois, Indiana, Michigan, Minnesota, Missouri and Oklahoma as well as one in 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 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 19 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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