ThePigSite.com - news, features, articles and disease information for the swine industry

News

PED Update in US: Two More States Report Positive Virus Tests

24 February 2014

US - The total number of swine farms testing positive for the Porcine Epidemic Diarrhoea (PED) virus now stands at 3,528, writes Jackie Linden. The first virus-positive environmental samples have been reported in Idaho and Montana. Please note: This report has been corrected following an error reported to us by the US National Pork Board.

Pig Farms Testing Positive for PEDv: 3,528

The total number of pig farms (termed 'laboratory biological accessions' in the official report) that have tested positive for the PED virus (PEDv) since April 2013 now stands at 3,528, which is 566 more than in the previous report.

The number of new positive 'laboratory swine accessions' (swine farms) for the current week - week of 9 February - was 272, bringing the total since testing began in June 2013 to 3,310.

For the current month to date, 1,673 farms have been tested, of which 573 or 34 per cent tested positive for the PEDv.

Since testing was fully reported in November 2013, 7,893 farms have been tested, of which 33 per cent have tested positive for the PED virus.

PED pig disease US
Figure 1. Number of swine farms positive for PEDv
(since April 2013; data from NAHLN)

Results by age class

Suckling pigs

For the current month to date, 223 farms have been tested, of which 105 were positive for PEDv.

Since testing was fully reported in November 2013, 979 farms have been tested, of which 711 tested positive for PEDv.

Nursery pigs

For the current month to date, 300 farms have been tested, of which 122 were positive for PEDv.

Since testing was fully reported in November 2013, 1,410 farms have been tested, of which 700 tested positive for PEDv.

Grower/finisher pigs

For the current month to date, 311 farms have been tested, of which 89 were positive for PEDv.

Since testing was fully reported in November 2013, 1,663 farms have been tested, of which 885 tested positive for PEDv.

Sows and boars

For the current month to date, 123 farms have been tested, of which 50 tested positive for PEDv.

Since testing was fully reported in November 2013, 505 farms have been tested, of which 343 tested positive for PEDv.

Unknown age class

For the current month to date, 760 farms have been tested, of which 226 tested positive for PEDv.

Since testing was fully reported in November 2013, 3,187 farms have been tested, of which 959 tested positive for PEDv.

Results by state

Two states - Idaho and Montana - have reported a first positive test results since the previous report, bringing the total number of states affected by PEDv to 25.

Those states with 30 or more positive tests are: Iowa, 1,159; Minnesota, 499; North Carolina, 414; Oklahoma, 263; Illinois, 211; Kansas, 179; Indiana, 133; Ohio, 125; Missouri, 48; Colorado, 41; Pennsylvania, 39; Texas, 37 and Michigan and Nebraska, each with 33.

For the most recent week (week of 9 February), Iowa once again leads the 'league table' in the number of new positive results, accounting for 79 of the total of 272 new cases, followed by Minnesota (46), Illinois (27), North Carolina (23), Ohio (21) and Indiana (20).

Individual Pigs Testing Positive for PEDv: 11,722

The total number of animals (termed 'biological samples' in the official report) since testing began in June 2013 now stands at 11,722, which is 2,336 more than the previous report.

For the current month to date, 7,408 samples were tested, of which 2,164 or 29 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 31,864 farms have been tested, of which 28 per cent tested positive for PEDv.

PED pig disease US
Figure 2. Number of pig samples positive for PEDv
(since June 2013; data from NAHLN)

Environmental Samples Testing Positive for PEDv: 2,425

The total number of environmental samples testing positive since testing began in June 2013 now stands at 2,425, which is 416 more than the previous report.

For the current month to date, 1,929 samples were tested, of which 436 or 23 per cent tested positive for PEDv.

Since testing was fully reported in November 2013, 7,684 farms have been tested, of which 24 per cent tested positive.

States with positive environmental samples in the latest week (9 February; positive/number of samples tested) are Iowa (36/177), Kansas (9/33), Minnesota (26/110), Missouri (6/18), North Carolina (27/80), Ohio (8/38), Oklahoma (6/60) and unknown (2/2).

PED pig disease US
Figure 3. Number of environmental samples positive for PEDv
(since June 2013; data from NAHLN)

Notes on the report

These data are collated by USDA APHIS VS NVSL National Animal Health Laboratory Network (NAHLN) and cited by the American Association of Swine Veterinarians (AASV) in a report dated 19 February 2014.

Veterinary diagnostic laboratories that have voluntarily reported PEDv testing data to NAHLN include: University of Georgia–Athens, University of Illinois, Iowa State University, Kansas State University, University of Minnesota, Nebraska Veterinary Diagnostic Center, Ohio Department of Agriculture, Purdue University, Michigan State University - Diagnostic Center for Population and Animal Health and South Dakota State University. This data does not include testing conducted at private diagnostic laboratories, at the NVSL, or for research purposes.

Data summaries provided in this report reflect the most current and complete data available at the time the report was prepared, and summaries in this report may differ from those provided in past reports.

Monitoring of PEDv testing started the week of 16 April 2013; April monthly totals include samples tested starting in that week.

USDA NAHLN began collating PEDv testing data on 16 June 2013. Weekly data prior to that date were provided by Iowa State University Diagnostic Laboratory. During the 2013 federal government shutdown, the University of Minnesota diagnostic collected and reported PEDv testing data (weeks of 22 September to 6 October 2013). Data from all sources are compiled in order to be as comprehensive as possible.

In general, a laboratory accession is a set of samples received at the laboratory where the samples were collected by a practitioner on a single premises on a single day. Therefore, each laboratory accession represents a single swine herd and each sample represents an individual animal tested for PEDvV on a given date. Because multiple swine within a herd are often simultaneously infected, analyses commonly use the laboratory accession as the epidemiological unit of interest.

Initially, some testing laboratories only provided data on PEDv-positive accessions and samples. Data on PEDV-negative accessions and samples became available from all laboratories starting November 2013. Therefore, summaries of the 'total number tested' (e.g. number of accessions tested or number of samples tested) were calculated for samples tested on or after 1 November 2013.

Age classes are defined as suckling (up to one month old or still on sow), nursery (one to three months), grower/finisher (three to eight months) and sow/boar (older than eight months).

This report does not currently include results of testing on feed samples.

This report only includes PCR testing data at this time, with addition testing types to be added to the report as information on the performance of new assays becomes available.

The format for this report is currently in transition as stakeholder feedback is incorporated.

Further Reading

Find out more information on PED by clicking here.

ThePigSite News Desk



Share This

News By

Related News

More News

Our Sponsors

Partners


Seasonal Picks

The Commuter Pig Keeper - 5m Books