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 44, and two premises were confirmed with porcine deltacoronavirus (PDCoV).

26 January 2015

5 minute read

By: Jackie Linden

North America

For the latest week – 11 to 17 January 2015 – there were 44 new confirmed positive premises for PEDV and four presumed positive, according to the latest report from USDA APHIS.

For the same period, two premises were confirmed positive for PDCoV but none was presumed positive, and there was one confirmed dual infection (both PEDV and PDCoV) but no presumed positives.

The total numbers of premises with confirmed positive status for the current week are 696, 28 and 23 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 721 confirmed positive premises, 371 presumed positive and 20 previously positive premises that have attained negative status.

For PDCoV, the total for the same period are 33, 26 and five, respectively. For the dual infection, the totals are 23, 26 and one, respectively.

Month	Nursery	Wean to finish	Farrow to finish	Finisher	Sow/ breeding	Un- known
Table 1. Number of 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	7 / -	16 / 2	6 / 1	41 / 4	13 / 3	26 / 6
Jan-15	- / -	3 / -	1 / -	3 / -	3 / -	9 / 1
Missing	- / -	1 / 1	- / -	1 / -	- / 1	2 / 1
Total	87 / 39	143 / 46	32 / 21	208/ 84	148 / 83	112 / 146

	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	444	13.7	1,982	50	2.5
Jan-15 to date	1,638	242	14.8	968	25	2.6
Total since Jun-14	23,250	2,663	11.5	10,955	276	2.5
Grand total	44,378	9,639	21.7	13,127	536	4.1

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 33 states with at least one confirmed positive case of PEDV.

For the current week (11 January), there were 118 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 2,664. Iowa reported 49 of these new cases and Minnesota, 16.

Also reporting positive results in this most recent week were California, Colorado, Idaho, Illinois, Indiana, Kansas, Kentucky, Michigan, Missouri, North Carolina, Nebraska, Ohio, Oklahoma, Pennsylvania, Texas, Utah and Wisconsin.

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 (11 January), there were 10 PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 274. There were four positive premises each in Iowa, two in Illinois and one each in Idaho, Indiana, Minnesota and "unknown".