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 27, and two premises were confirmed with porcine deltacoronavirus (PDCoV) and one with the dual infection (PEDV and PDCoV). Virginia reported its first positive result in January 2015.

4 February 2015

5 minute read

By: Jackie Linden

North America

For the latest week – 18 to 24 January 2015 – there were 27 new confirmed positive premises for PEDV and two presumed positive, according to the latest report from USDA APHIS made available by the American Association of Swine Veterinarians (AASV).

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 724, 30 and 24 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 748 confirmed positive premises, 373 presumed positive and 21 previously positive premises that have attained negative status.

For PDCoV, the total for the same period are 35, 26 and six, respectively. For the dual infection, the totals are 24, 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	8 / 0	18 / 2	7 / 1	48 / 4	19 / 4	17 / 6
Jan-15	5 / 0	8 / 1	1 / 0	11 / 0	5 / 0	11 / 1
Total	97 / 41	171 / 50	37 / 21	240/ 86	167 / 85	95 / 142

	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 to date	2,348	377	16.1	1,379	41	3.0
Total since Jun-14	23,960	2,815	11.7	11,366	291	2.6
Grand total	45,088	9,791	21.7	13,538	551	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 34 states with at least one confirmed positive case of PEDV. Virginia reported its first positive result in the week of 11 January 2015.

For the current week (18 January), there were 134 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 2,815. Iowa reported 46 of these new cases, North Carolina 19, Illinois, 17 and Minnesota 14.

Also reporting positive results in this most recent week were California, Colorado, Idaho, Indiana, Kansas, Kentucky, Missouri, Ohio, Oklahoma, Pennsylvania, 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 (18 January), there were 17 PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 289. There were four positive premises in Minnesota, three each in Iowa and Illinois, two each in Indiana and Michigan and one each in Idaho, North Carolina nd Oklahoma.