Update on Swine Enteric Coronavirus Disease in US

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).

9 March 2015

5 minute read

By: Jackie Linden

North America

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.

Month	Nursery	Wean to finish	Farrow to finish	Finisher	Sow/ breeding	Un- known
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)
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

	PEDV			PDCoV
Table 2. Biological accessions tested and number positive by month (since 5 June 2014)
Month	Tested	Positive	% positive	Tested	Positive	% 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

Figure 1. PED-positive biological accessions in the US, by week (since 5 June 2014)

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".

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.

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.