Bryan Richards is the Emerging Disease Coordinator at the USGS National Wildlife Health Center.
Science and Products
Expanding Distribution of Chronic Wasting Disease
Chronic wasting disease (CWD) has been detected in 31 US states and four Canadian provinces in free-ranging cervids and/or commercial captive cervid facilities. CWD has been detected in free-ranging cervids in 31 states and three provinces and in captive cervid facilities in 18 states and three provinces.
Examining PRNP gene frequencies and ‘resistance’ to chronic wasting disease
Multiple studies have demonstrated that various alleles of the cervid prion protein (PRNP) gene affect chronic wasting disease (CWD) progression.
Application of a systems approach for management of chronic wasting disease
Managing chronic wasting disease (CWD) involves more than understanding the ecology of the disease. It includes complex relationships among social, economic, and political factors that affect intervention opportunities, consequences for stakeholders, and ultimately disease outcomes. The USGS National Wildlife Health Center, Montana Cooperative Wildlife Research Unit, Ventana Systems, Inc., and the...
Distribution of Highly Pathogenic Avian Influenza in North America, 2021/2022
The first 2021/2022 detection of Eurasian strain (EA) highly pathogenic avian influenza (HPAI) H5N1 in North America occurred in December 2021 in Newfoundland and Labrador, Canada. Subsequently, HPAI EA H5 and EA H5N1 viruses have been confirmed in wild birds, backyard flocks, commercial poultry facilities, and wild mammals in both Canada and the United States. This HPAI distribution map will be...
Avian Influenza Surveillance
The USGS National Wildlife Health Center (NWHC) conducts surveillance in wild birds to facilitate early detection and situational awareness for high consequence pathogens, including highly pathogenic avian influenza (HPAI) viruses.
SARS-CoV-2 in Wildlife
As SARS-CoV-2, the virus that causes COVID-19 in humans, continues to spread globally, questions have emerged about the potential for humans to transmit the virus to North American wildlife, its potential effects on native wildlife populations, and the resultant possibility and consequences of establishing a persistent wildlife reservoir. Recent studies have detected SARS-CoV-2 in escaped or wild...
Chronic Wasting Disease
Chronic wasting disease (CWD) is an emerging infectious disease that is fatal to free-ranging and captive animals in Cervidae, the deer family. CWD is one member of a family of diseases called transmissible spongiform encephalopathies (TSEs), and is thought to be caused by prions. CWD is the only TSE known to affect free-ranging wildlife.
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Expanding Distribution of Chronic Wasting Disease
Chronic wasting disease (CWD) has been detected in 31 US states and four Canadian provinces in free-ranging cervids and/or commercial captive cervid facilities. CWD has been detected in free-ranging cervids in 31 states and three provinces and in captive cervid facilities in 18 states and three provinces.Examining PRNP gene frequencies and ‘resistance’ to chronic wasting disease
Multiple studies have demonstrated that various alleles of the cervid prion protein (PRNP) gene affect chronic wasting disease (CWD) progression.Application of a systems approach for management of chronic wasting disease
Managing chronic wasting disease (CWD) involves more than understanding the ecology of the disease. It includes complex relationships among social, economic, and political factors that affect intervention opportunities, consequences for stakeholders, and ultimately disease outcomes. The USGS National Wildlife Health Center, Montana Cooperative Wildlife Research Unit, Ventana Systems, Inc., and the...Distribution of Highly Pathogenic Avian Influenza in North America, 2021/2022
The first 2021/2022 detection of Eurasian strain (EA) highly pathogenic avian influenza (HPAI) H5N1 in North America occurred in December 2021 in Newfoundland and Labrador, Canada. Subsequently, HPAI EA H5 and EA H5N1 viruses have been confirmed in wild birds, backyard flocks, commercial poultry facilities, and wild mammals in both Canada and the United States. This HPAI distribution map will be...Avian Influenza Surveillance
The USGS National Wildlife Health Center (NWHC) conducts surveillance in wild birds to facilitate early detection and situational awareness for high consequence pathogens, including highly pathogenic avian influenza (HPAI) viruses.SARS-CoV-2 in Wildlife
As SARS-CoV-2, the virus that causes COVID-19 in humans, continues to spread globally, questions have emerged about the potential for humans to transmit the virus to North American wildlife, its potential effects on native wildlife populations, and the resultant possibility and consequences of establishing a persistent wildlife reservoir. Recent studies have detected SARS-CoV-2 in escaped or wild...Chronic Wasting Disease
Chronic wasting disease (CWD) is an emerging infectious disease that is fatal to free-ranging and captive animals in Cervidae, the deer family. CWD is one member of a family of diseases called transmissible spongiform encephalopathies (TSEs), and is thought to be caused by prions. CWD is the only TSE known to affect free-ranging wildlife. - Publications
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