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 39, and three premises were confirmed with porcine deltacoronavirus (PDCoV).

19 January 2015

5 minute read

By: Jackie Linden

North America

For the latest week – 4 to 10 January 2015 – there were 39 new confirmed positive premises for PEDV and six presumed positive, according to the latest report from USDA APHIS.

For the same period, three premises were confirmed positive for PDCoV but none was presumed positive, neither were there any confirmed or presumed dual infections (both PEDV and PDCoV).

The total numbers of premises with confirmed positive status for the current week are 653, 26 and 22 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 677 confirmed positive premises, 367 presumed positive and 20 previously positive premises that have attained negative status.

For PDCoV, the total for the same period are 31, 26 and six, respectively. For the dual infection, the totals are 22, 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	5 / 1	10 / 3	1 / -	40 / 5	11 / 8	21 / 8
Dec-14	4 / -	2 / 1	3 / 1	33 / 3	8 / 3	30 / 5
Jan-15	- / -	- / -	- / -	- / -	- / -	4 / -
Missing	- / -	1 / 1	- / -	1 / -	- / 1	- / 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	447	13.8	1,982	50	2.5
Jan-15 to date	888	124	14.0	528	15.0	2.8
Total since Jun-14	22,500	2,567	11.4	10,515	269	2.6
Grand total	43,628	9,543	21.9	12,687	529	4.2

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 (4 January), there were 115 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 2,575. Iowa reported 37 of these new cases, Illinois 12, North Carolina 11, Minnesota 10 and Missouri, nine.

Also reporting positive results in this most recent week were Arizona, California, Colorado, Idaho, Indiana, Kansas, Michigan, Nebraska, Ohio, Oklahoma, Pennsylvania, South Dakota, Texas, Utah and Wyoming.

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 (4 January), there were 16 PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 272. There were three positive premises each in Iowa and Illinois, two each in California, Michigan and Minnesota and one each in Idaho, Indiana, Missouri and Oklahoma.