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 17, while three premises were confirmed with porcine deltacoronavirus (PDCoV) and none with the dual infection (PEDV and PDCoV).

11 May 2015

5 minute read

By: Jackie Linden

North America

For the latest week – 26 April to 2 May – there were 17 new confirmed positive premises for PEDV and one presumed positive, according to the latest report from USDA Animal and Plant Health Inspection Service (APHIS).

For the same period, three premises were confirmed positive for PDCoV but none presumed positive. For the dual infection, one premised was confirmed positive for the virus and one presumed positive.

The total numbers of premises with confirmed positive status for the current week are 1,223, 58 and 47 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 1,307 confirmed positive premises, 428 presumed positive and 72 previously positive premises that have attained negative status.

For PDCoV, the total for the same period are 64, 29 and five, respectively. For the dual infection, the totals are 49, 28 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	21 / 13	31 / 17	14 / 8	24 / 28	47 / 46	13 / 52
Jul-14	25 / 12	39 / 8	6 / 5	21 / 15	35 / 14	13 / 30
Aug-14	15 / 8	17 / 8	2 / 5	25 / 10	12 / 7	11 / 18
Sep-14	17 / 5	21 / 7	2 / 3	31 / 9	30 / 6	6 / 12
Oct-14	4 / 4	30 / 7	4 / 0	37 / 16	11 / 3	5 / 7
Nov-14	7 / 1	19 / 3	3 / 0	45 / 6	13 / 10	14 / 7
Dec-14	19 / 1	45 / 2	12 / 4	62 / 8	21 / 4	8 / 4
Jan-15	20 / 3	72 / 7	9 / 0	74 / 12	19 / 1	40 / 5
Feb-15	20 / 1	48 / 2	7 / 0	60 / 7	17 / 1	32 / 2
Mar-15	18 / 4	44/ 0	6 / 1	29 / 1	15 / 0	21 / 3
Apr-15	4 / 0	4 / 1	2 / 0	8 / 2	3 / 0	1 / 0
Total	170 / 52	372 / 62	67 / 26	418 / 115	224 / 91	169 / 139

	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	2,981	461	15.5	1,802	49	2.7
Mar-15	3,304	597	18.1	1,898	58	3.1
Apr-15	3,019	451	14.9	1,788	31	1.7
May-15 to date	121	21	17.4	69	3	4.3
Total since Jun-14	34,139	4,476	13.1	17,421	443	2.5
Grand total	55,267	11,452	20.7	19,593	703	3.6

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 (26 April), there were 76 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 4,478. Iowa reported 20 of these new cases, Minnesota 14 and North Carolina 13.

Also reporting positive results in this most recent week were Illinois, Indiana, Kansas, Michigan, Missouri, Nebraska, Ohio, Oklahoma, Utah, Wyoming and "unknown".

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 (26 April), there were 10 PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 439. There was four positive premises in Iowa, three in Illinois, two in Minnesota and one in Texas.