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 55, two premises were confirmed with porcine deltacoronavirus (PDCoV) and five with the dual infection (PEDV and PDCoV).

20 February 2015

5 minute read

By: Jackie Linden

North America

For the latest week – 8 to 14 February 2015 – there were 55 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 were five confirmed dual infection (both PEDV and PDCoV) and one presumed positive.

The total numbers of premises with confirmed positive status for the current week are 887, 37 and 32 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 913 confirmed positive premises, 397 presumed positive and 24 previously positive premises that have attained negative status.

For PDCoV, the total for the same period are 43, 26 and five, respectively. For the dual infection, the totals are 32, 27 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	16 / 0	36 / 2	12 / 3	59 / 6	19 / 4	13 / 4
Jan-15	16 / 1	47 / 4	6 / 0	42 / 8	7 / 1	32 / 5
Feb-15 to date	0 / 0	8 / 1	0 / 0	5 / 1	3 / 0	1 / 0
Total	116 / 43	241 / 55	46 / 24	288/ 98	177 / 90	113 / 135

	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	3,085	498	16.1	1,845	44	2.4
Feb-15 to date	1,470	217	14.8	871	23	2.6
Total since Jun-14	26,170	3,154	12.1	12,703	317	2.5
Grand total	47,298	10,130	21.4	14,875	577	3.9

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. Most recent was Virginia, which reported its first positive result in January 2015.

For the current week (8 February), there were 104 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 3,153. Iowa reported 37 of these new cases, North Carolina 19 and Illinois 13.

Also reporting positive results in this most recent week were California, Colorado, Indiana, Kansas, Kentucky, Michigan, Minnesota, Nebraska, Oklahoma, Pennsylvania, South Dakota, Texas, Wyoming 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 (2 February), there were 12 PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 316. There were four positive premises in Iowa, two each in Indiana, Michigan and "unknown" and one each in North Carolina and Ohio.

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, each with nine confirmed positive results. APHIS has not updated the table giving the location of the new positive results this week.