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

16 February 2015

5 minute read

By: Jackie Linden

North America

For the latest week – 1 to 7 February 2015 – there were 49 new confirmed positive premises for PEDV and 12 presumed positive, according to the latest report from USDA APHIS.

For the same period, four premises were confirmed positive for PDCoV but none was presumed positive, and there were two 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 834, 36 and 27 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 859 confirmed positive premises, 393 presumed positive and 23 previously positive premises that have attained negative status.

For PDCoV, the total for the same period are 41, 26 and five, respectively. For the dual infection, the totals are 27, 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	14 / 0	35 / 2	12 / 3	59 / 6	19 / 4	12 / 4
Jan-15	15 / 1	32 / 4	3 / 0	36 / 7	8 / 1	19 / 5
Feb-15 to date	0 / 0	0 / 0	0 / 0	0 / 0	1 / 0	0 / 0
Total	113 / 41	216 / 54	43 / 23	278/ 97	176 / 90	96 / 136

	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	768	113	14.7	485	11	2.3
Total since Jun-14	25,468	3,050	12.0	12,317	305	2.5
Grand total	46,596	10,026	21.5	14,489	565	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 (1 February), there were 113 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 3,050. Iowa reported 40 of these new cases, North Carolina 17 and 11 each in Minnesota and Missouri.

Also reporting positive results in this most recent week were California, Illinois, Indiana, Kansas, Michigan, Nebraska, Ohio, Oklahoma, South Dakota, Texas, Utah, 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 (1 February), there were 11 PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 305. There were two positive premises in each of Iowa, North Carolina and Ohio and one each in Indiana, Minnesota, South Dakota and "unknown".