Erik Hofmeister
Erik Hofmeister is a Research Virologist at the National Wildlife Health Center.
Science and Products
Filter Total Items: 35
Prevalence and effects of West Nile virus on wild American kestrel (Falco sparverius) populations in Colorado
To assess the potential impacts of West Nile virus (WNV) on a wild population of free-ranging raptors, we investigated the prevalence and effects of WNV on American Kestrels (Falco sparverius) breeding along the Front Range of the Rocky Mountains in northern Colorado. We monitored kestrel nesting activity at 131 nest boxes from March to August 2004. Of 81 nest attempts, we obtained samples from 11
Authors
Robert J. Dusek, William M. Iko, Erik K. Hofmeister
Seroprevalence of West Nile Virus in feral horses on Sheldon National Wildlife Refuge, Nevada, United States
We screened 1,397 feral horses (Equus caballus) on Sheldon National Wildlife Refuge, Nevada, United States, for IgM and IgG against flavivirus during 2004–2006, 2008, and 2009. Positive serum samples were tested for neutralizing antibodies to West Nile virus (WNV) and St. Louis encephalitis virus (SLEV). One animal was positive for antibody against WNV in 2004, but all others tested in 2004–2006 w
Authors
J. Christian Franson, Erik K. Hofmeister, Gail H. Collins, Robert J. Dusek
West Nile virus: North American experience
West Nile virus, a mosquito-vectored flavivirus of the Japanese encephalitis serogroup, was first detected in North America following an epizootic in the New York City area in 1999. In the intervening 11 years since the arrival of the virus in North America, it has crossed the contiguous USA, entered the Canadian provinces bordering the USA, and has been reported in the Caribbean islands, Mexico,
Authors
Erik K. Hofmeister
Climate change and wildlife health: direct and indirect effects
Climate change will have significant effects on the health of wildlife, domestic animals, and humans, according to scientists. The Intergovernmental Panel on Climate Change projects that unprecedented rates of climate change will result in increasing average global temperatures; rising sea levels; changing global precipitation patterns, including increasing amounts and variability; and increasing
Authors
Erik K. Hofmeister, Gail Moede Rogall, Katherine Wesenberg, Rachel C. Abbott, Thierry M. Work, Krysten Schuler, Jonathan M. Sleeman, James Winton
Testing independent and interactive effects of corticosterone and synergized resmethrin on the immune response to West Nile virus in chickens
Public health agencies utilize aerial insecticides to interrupt an active West Nile virus (WNV) transmission cycle, which may expose WNV-infected birds to these agents. Although resmethrin has been considered benign to birds, no studies have evaluated whether the environmentally employed form of resmethrin with PBO synergist (synergized resmethrin (SR)) can suppress avian immunity to WNV infection
Authors
Mark D. Jankowski, J. Christian Franson, Erich Möstl, Warren P. Porter, Erik K. Hofmeister
Occurrence of West Nile virus infection in raptors at the Salton Sea, California
We investigated the prevalence of West Nile virus (WNV)-neutralizing antibodies and infectious virus, and the occurrence of overwinter transmission in two raptor species during January and March 2006 at the Salton Sea, Imperial County, California. We captured 208 American Kestrels (Falco sparverius) (January, n=100; March, n=108) and 116 Burrowing Owls (Athene cunicularia) (January, n=52; March, n
Authors
Robert J. Dusek, William M. Iko, Erik K. Hofmeister
Elodontoma in captive southern red-backed voles (Myodes gapperi)
Five southern red-backed voles (Myodes gapperi) of the first generation of a wild-caught breeding colony were presented with lesions at the maxillary incisors consistent with elodontoma. The affected animals had a history of chronic weight loss, were >16 months of age, and were siblings. Radiographs of the head showed multiglobular to irregularly outlined mineral opacity masses at the apices of th
Authors
Julia Rodriguez-Ramos Fernandez, Marie E. Pinkerton, Dennis M. Heisey, Randi Drees, Jay Schneider, Lacey Stickney, Erik K. Hofmeister, David Sanchez-Migallon Guzman
The adrenocortical response of greater sage grouse (Centrocercus urophasianus) to capture, ACTH injection, and confinement, as measured in fecal samples
Investigators of wildlife populations often utilize demographic indicators to understand the relationship between habitat characteristics and population viability. Assessments of corticosterone may enable earlier detection of populations at risk of decline because physiological adjustments to habitat disturbance occur before reproductive diminutions. Noninvasive methods to accomplish these assesme
Authors
M.D. Jankowski, D.J. Wittwer, D.M. Heisey, J. Christian Franson, Erik K. Hofmeister
Experimental infection of Hawai'i 'Amakihi (hemignathus virens) with West Nile virus and competence of a co-occurring vector, culex quinquefasciatus: potential impacts on endemic Hawaiian avifauna.
Introduced mosquito-borne avian disease is a major limiting factor in the recovery and restoration of native Hawaiian forest birds. Annual epizootics of avian pox (Avipoxvirus) and avian malaria (Plasmodium relictum) likely led to the extinction of some species and continue to impact populations of susceptible Hawaiian honeycreepers (Drepanidinae). The introduction of a novel pathogen, such as Wes
Authors
Dennis Lapointe, Erik K. Hofmeister, C. T. Atkinson, R.E. Porter, Robert J. Dusek
Oral and parenteral immunization of chickens (Gallus gallus) against West Nile virus with recombinant envelope protein
West Nile virus (WNV) causes morbidity and mortality in humans, horses, and in more than 315 bird species in North America. Currently approved WNV vaccines are designed for parenteral administration and, as yet, no effective oral WNV vaccines have been developed. WNV envelope (E) protein is a highly antigenic protein that elicits the majority of virus-neutralizing antibodies during a WNV immune re
Authors
C. A. Fassbinder-Orth, Erik K. Hofmeister, C. Weeks-Levy, W. H. Karasov
Impact of West Nile virus and other mortality factors on American white pelicans at breeding colonies in the northern plains of North America
American white pelicans (Pelecanus erythrorhynchos) are colonial-nesting birds and their breeding sites are concentrated in a few small areas, making this species especially vulnerable to factors that can influence productivity, such as disease, disturbance, predation, weather events and loss of nesting habitat. Nearly half of the American white pelican population breeds at four colonies in the no
Authors
M.A. Sovada, P.J. Pietz, K. A. Converse, King D. Tommy, Erik K. Hofmeister, P. Scherr, Hon S. Ip
Science and Products
Filter Total Items: 35
Prevalence and effects of West Nile virus on wild American kestrel (Falco sparverius) populations in Colorado
To assess the potential impacts of West Nile virus (WNV) on a wild population of free-ranging raptors, we investigated the prevalence and effects of WNV on American Kestrels (Falco sparverius) breeding along the Front Range of the Rocky Mountains in northern Colorado. We monitored kestrel nesting activity at 131 nest boxes from March to August 2004. Of 81 nest attempts, we obtained samples from 11
Authors
Robert J. Dusek, William M. Iko, Erik K. Hofmeister
Seroprevalence of West Nile Virus in feral horses on Sheldon National Wildlife Refuge, Nevada, United States
We screened 1,397 feral horses (Equus caballus) on Sheldon National Wildlife Refuge, Nevada, United States, for IgM and IgG against flavivirus during 2004–2006, 2008, and 2009. Positive serum samples were tested for neutralizing antibodies to West Nile virus (WNV) and St. Louis encephalitis virus (SLEV). One animal was positive for antibody against WNV in 2004, but all others tested in 2004–2006 w
Authors
J. Christian Franson, Erik K. Hofmeister, Gail H. Collins, Robert J. Dusek
West Nile virus: North American experience
West Nile virus, a mosquito-vectored flavivirus of the Japanese encephalitis serogroup, was first detected in North America following an epizootic in the New York City area in 1999. In the intervening 11 years since the arrival of the virus in North America, it has crossed the contiguous USA, entered the Canadian provinces bordering the USA, and has been reported in the Caribbean islands, Mexico,
Authors
Erik K. Hofmeister
Climate change and wildlife health: direct and indirect effects
Climate change will have significant effects on the health of wildlife, domestic animals, and humans, according to scientists. The Intergovernmental Panel on Climate Change projects that unprecedented rates of climate change will result in increasing average global temperatures; rising sea levels; changing global precipitation patterns, including increasing amounts and variability; and increasing
Authors
Erik K. Hofmeister, Gail Moede Rogall, Katherine Wesenberg, Rachel C. Abbott, Thierry M. Work, Krysten Schuler, Jonathan M. Sleeman, James Winton
Testing independent and interactive effects of corticosterone and synergized resmethrin on the immune response to West Nile virus in chickens
Public health agencies utilize aerial insecticides to interrupt an active West Nile virus (WNV) transmission cycle, which may expose WNV-infected birds to these agents. Although resmethrin has been considered benign to birds, no studies have evaluated whether the environmentally employed form of resmethrin with PBO synergist (synergized resmethrin (SR)) can suppress avian immunity to WNV infection
Authors
Mark D. Jankowski, J. Christian Franson, Erich Möstl, Warren P. Porter, Erik K. Hofmeister
Occurrence of West Nile virus infection in raptors at the Salton Sea, California
We investigated the prevalence of West Nile virus (WNV)-neutralizing antibodies and infectious virus, and the occurrence of overwinter transmission in two raptor species during January and March 2006 at the Salton Sea, Imperial County, California. We captured 208 American Kestrels (Falco sparverius) (January, n=100; March, n=108) and 116 Burrowing Owls (Athene cunicularia) (January, n=52; March, n
Authors
Robert J. Dusek, William M. Iko, Erik K. Hofmeister
Elodontoma in captive southern red-backed voles (Myodes gapperi)
Five southern red-backed voles (Myodes gapperi) of the first generation of a wild-caught breeding colony were presented with lesions at the maxillary incisors consistent with elodontoma. The affected animals had a history of chronic weight loss, were >16 months of age, and were siblings. Radiographs of the head showed multiglobular to irregularly outlined mineral opacity masses at the apices of th
Authors
Julia Rodriguez-Ramos Fernandez, Marie E. Pinkerton, Dennis M. Heisey, Randi Drees, Jay Schneider, Lacey Stickney, Erik K. Hofmeister, David Sanchez-Migallon Guzman
The adrenocortical response of greater sage grouse (Centrocercus urophasianus) to capture, ACTH injection, and confinement, as measured in fecal samples
Investigators of wildlife populations often utilize demographic indicators to understand the relationship between habitat characteristics and population viability. Assessments of corticosterone may enable earlier detection of populations at risk of decline because physiological adjustments to habitat disturbance occur before reproductive diminutions. Noninvasive methods to accomplish these assesme
Authors
M.D. Jankowski, D.J. Wittwer, D.M. Heisey, J. Christian Franson, Erik K. Hofmeister
Experimental infection of Hawai'i 'Amakihi (hemignathus virens) with West Nile virus and competence of a co-occurring vector, culex quinquefasciatus: potential impacts on endemic Hawaiian avifauna.
Introduced mosquito-borne avian disease is a major limiting factor in the recovery and restoration of native Hawaiian forest birds. Annual epizootics of avian pox (Avipoxvirus) and avian malaria (Plasmodium relictum) likely led to the extinction of some species and continue to impact populations of susceptible Hawaiian honeycreepers (Drepanidinae). The introduction of a novel pathogen, such as Wes
Authors
Dennis Lapointe, Erik K. Hofmeister, C. T. Atkinson, R.E. Porter, Robert J. Dusek
Oral and parenteral immunization of chickens (Gallus gallus) against West Nile virus with recombinant envelope protein
West Nile virus (WNV) causes morbidity and mortality in humans, horses, and in more than 315 bird species in North America. Currently approved WNV vaccines are designed for parenteral administration and, as yet, no effective oral WNV vaccines have been developed. WNV envelope (E) protein is a highly antigenic protein that elicits the majority of virus-neutralizing antibodies during a WNV immune re
Authors
C. A. Fassbinder-Orth, Erik K. Hofmeister, C. Weeks-Levy, W. H. Karasov
Impact of West Nile virus and other mortality factors on American white pelicans at breeding colonies in the northern plains of North America
American white pelicans (Pelecanus erythrorhynchos) are colonial-nesting birds and their breeding sites are concentrated in a few small areas, making this species especially vulnerable to factors that can influence productivity, such as disease, disturbance, predation, weather events and loss of nesting habitat. Nearly half of the American white pelican population breeds at four colonies in the no
Authors
M.A. Sovada, P.J. Pietz, K. A. Converse, King D. Tommy, Erik K. Hofmeister, P. Scherr, Hon S. Ip