2. Signs of airborne H5N2 found; Iowa reports more outbreaks
Robert Roos, News Editor
CIDRAP News
May 8, 2015
Evidence of the H5N2 avian influenza virus has been found in air samples collected in and near infected Minnesota poultry barns, a researcher said today, supporting the suspicion that the virus may go airborne for short distances, while Iowa reported seven new H5 outbreaks involving 4 million chickens and an unknown number of turkeys.
In addition, Wisconsin authorities today reported finding H5N2 in an owl along Green Bay, while hard-hit Minnesota had its second day this week without any new poultry outbreaks.
Air sampling findings
Montse Torremorell, DVM, PhD, of the University of Minnesota said she and three colleagues did a pilot air sampling study at three Minnesota farms with infected poultry.
"Our results indicated that influenza genetic material can be detected in air samples collected inside and immediately outside of infected poultry facilities. We still don't know whether virus was viable or not, and those analyses are in progress," said Torremorell, who holds the Allen D. Leman Chair in swine health and productivity.
"So far we have shown that HPAI [highly pathogenic avian influenza] can be aerosolized from infected facilities," she added. "However, the implications of these findings in terms of understanding the transmission of HPAI between flocks needs further investigation." The study focused on a total of four poultry barns on the three farms.
Torremorell said the study was commissioned by the US Department of Agriculture's Animal and Plant Health Inspection Service (APHIS). The agency's National Veterinary Services Laboratories (NVSL) in Ames, Iowa, are testing the samples to see if they contain any viable virus particles.
Other participants in the study are Peter Davies, BVSc, PhD, Peter Raynor, PhD, and Carmen Alonso, DVM, all with the University of Minnesota in St. Paul, Torremorell said.
The possibility of airborne transmission of H5N2 has been increasingly discussed as the situation has evolved over the past 2 months. In the early going, affected farms were widely scattered, and in most cases only one barn on each farm was infected. The general assumption was that particles of infected feces from wild waterfowl were being carried into barns by workers or equipment.
But more recently, multiple neighboring farms and multiple barns per farm have been hit, suggesting that the virus may be spreading from farm to farm and barn to barn, possibly via airborne dust or feathers. The results noted by Torremorell today mark the first reported effort to test the hypothesis in the current H5N2 crisis.
Full text:
http://www.cidrap.umn.edu/news-perspective/2015/05/signs-airborne-h5n2-found-iowa-reports-more-outbreaks
See Also:
USDA Confirms More Highly Pathogenic H5N2 Avian Influenza in Seven Flocks in Iowa
USDA Animal and Plant Health Inspection Service Bulletin
May 8, 2015
WASHINGTON - The United States Department of Agriculture's (USDA) Animal and Plant Health Inspection Service (APHIS) has confirmed the presence of highly pathogenic H5N2 avian influenza (HPAI) in additional seven flocks in Iowa. No human infections with the virus have been detected at this time. CDC considers the risk to people from these HPAI H5 infections in wild birds, backyard flocks and commercial poultry, to be low.
USDA's National Veterinary Services Laboratories confirmed HPAI H5N2 in the following counties and states:
Sioux County, Iowa (May 7, 2015)
Chickens (number pending)
5th detection in this county
Sioux County, Iowa (May 7, 2015)
1 million chickens
6th detection in this county
Buena Vista County, Iowa (May 7, 2015)
45,000 turkeys
9th detection in this county*
Sioux County, Iowa (May 7, 2015)
80,998 chickens
7th detection in this county
Buena Vista County, Iowa (May 7, 2015)
100,000 turkeys
11th detection in this county*
Osceola County, Iowa (May 7, 2015)
100,000 chickens
3rd detection in this county
Wright County, Iowa (May 7, 2015)
2.8 million
1st detection in this county
Full text:
http://content.govdelivery.com/accounts/USDAAPHIS/bulletins/1037032
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