Tonie Rocke
Tonie Rocke is a Research Epidemiologist at the National Wildlife Health Center.
Science and Products
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Filter Total Items: 134
Preliminary evaluation of a simple in vitro test for the diagnosis of type C botulism in wild birds Preliminary evaluation of a simple in vitro test for the diagnosis of type C botulism in wild birds
An enzyme-linked immunosorbent assay (ELISA) was developed for the detection of type C botulinum toxin (Clostridium botulinum) in wild birds. This simple, antigen-capture ELISA utilizes polystyrene immunosticks as the solid substrate, chicken antitoxin (IgY) as the coating antibody, rabbit antitoxin as the primary antibody, and peroxidase-labeled goat-anti-rabbit as the secondary...
Authors
Tonie Rocke, Susan Smith, Sean Nashold
The inhibition of Clostridium botulinum type C by other bacteria in wetland sediments The inhibition of Clostridium botulinum type C by other bacteria in wetland sediments
Bacteria with inhibitory activity against Clostridium botulinum type C were isolated from 32% of sediment samples (n = 1600) collected from 10 marshes in a northern California wetland over a 12 mo period. Aerobic and anaerobic bacteria with inhibitory activity were isolated from 12% and 23% of the samples, respectively. Bacteria with inhibitory activity were isolated from all 10 study...
Authors
Renee Sandler, Tonie Rocke, Thomas Yuill
Site-specific lead exposure from lead pellet ingestion in sentinel mallards Site-specific lead exposure from lead pellet ingestion in sentinel mallards
We monitored lead poisoning from the ingestion of spent lead pellets in sentinel mallards (Anas platyhrynchos) at the Sacramento National Wildlife Refuge (SNWR), Willows, California for 4 years (1986-89) after the conversion to steel shot for waterfowl hunting on refuges in 1986. Sentinel mallards were held in 1.6-ha enclosures in 1 hunted (P8) and 2 non-hunted (T19 and TF) wetlands. We...
Authors
Tonie E. Rocke, C. Brand, John Mensik
Use of sentinel mallards for epizootiologic studies of avian botulism Use of sentinel mallards for epizootiologic studies of avian botulism
Captive-reared mallards (Anas platyrhynchos) were used as sentinels to study the epizootiology of avian botulism at the Sacramento National Wildlife Refuge, Willows, California (USA) from 1986 to 1989. Sentinel mallards were wing-clipped, and 40 to 50 birds were confined in 1.6-ha enclosures in 11 selected wetlands (pools). Enclosures were searched intensively three to four times weekly...
Authors
Tonie E. Rocke, C. Brand
Seasonal prevalence of Clostridium botulinum type C in the sediments of the northern California wetland Seasonal prevalence of Clostridium botulinum type C in the sediments of the northern California wetland
The prevalence of Clostridium botulinum type C (% of positive sediment samples) was determined in 10 marshes at Sacramento National Wildlife Refuge (SNWR), located in the Central Valley of California (USA), where avian botulism epizootics occur regularly. Fifty-two percent of 2,200 sediment samples collected over an 18-mo period contained C. botulinum type C (both neurotoxic and...
Authors
Renee Sandler, Tonie E. Rocke, M.D. Samuel, Thomas Yuill
The role of avian carcasses in botulism epizootics The role of avian carcasses in botulism epizootics
No abstract available.
Authors
T.M. Reed, Tonie E. Rocke
Brain acetycholinesterase activity in botulism-intoxicated mallards Brain acetycholinesterase activity in botulism-intoxicated mallards
Brain acetylcholinesterase (AChE) activity in captive-reared mallards (Anas platyrhynchos) that died of botulism was compared with euthanized controls. AChE levels for both groups were within the range reported for normal mallards, and there was no significant difference in mean AChE activity between birds that ingested botulism toxin and died and those that did not.
Authors
Tonie E. Rocke, M.D. Samuel
Effects of lead shot ingestion on selected cells of the mallard immune system Effects of lead shot ingestion on selected cells of the mallard immune system
The immunologic effects of lead were measured in game-farm mallards (Anas platyrhynchos) that ingested lead shot while foraging naturally, mallards intubated with lead shot, and unexposed controls. Circulating white blood cells (WBC) declined significantly in male mallards exposed to lead by either natural ingestion or intubation, but not females. Spleen plaque-forming cell (SPFC) counts...
Authors
Tonie E. Rocke, M.D. Samuel
Blood lead concentrations in mallards from Delevan and Colusa National Wildlife Refuges Blood lead concentrations in mallards from Delevan and Colusa National Wildlife Refuges
Blood samples were taken from 181 (108 adult drakes and 73 individuals of mixed age and sex) mallards, Anas platyrhynchos, from Colusa and Delevan National Wildlife Refuges during late winter and summer of 1987. The percentage of birds with elevated lead concentration was 28.7 for late winter and 16.4 for late summer. For summer trapped birds, a significantly greater proportion of males...
Authors
David Mauser, Tonie Rocke, John Mensik, Christopher Brand
Experimental Mycoplasma gallisepticum infections in captive-reared wild turkeys Experimental Mycoplasma gallisepticum infections in captive-reared wild turkeys
The effects of Mycoplasma gallisepticum (MG) infections on egg production, fertility, and hatchability were studied in captive-reared wild turkeys (Meleagris gallopavo). Three groups of adult birds, each consisting of four hens and two toms, were exposed to MG by the respiratory route at the beginning of their breeding season. Fourteen control birds received sterile growth medium...
Authors
Tonie Rocke, Thomas Yuill, Terry Amundson
Hematozoan parasites of Rio Grande wild turkeys from southern Texas (USA) Hematozoan parasites of Rio Grande wild turkeys from southern Texas (USA)
One hundred twenty-three of 300 blood samples (41%) taken from Rio Grande wild turkeys (Meleagris gallopavo intermedia) from three locations in southern Texas (Welder Wildlife Refuge, Chaparrosa Ranch, and Campo Alegre Ranch) and subinoculated into domestic broad-breasted white turkey poults were positive for a Plasmodium (Novyella) sp. Analysis of blood films from 350 turkeys revealed
Authors
Marc Castle, Beth Christensen, Tonie Rocke
Science and Products
Filter Total Items: 15
No Result Found
Filter Total Items: 134
Preliminary evaluation of a simple in vitro test for the diagnosis of type C botulism in wild birds Preliminary evaluation of a simple in vitro test for the diagnosis of type C botulism in wild birds
An enzyme-linked immunosorbent assay (ELISA) was developed for the detection of type C botulinum toxin (Clostridium botulinum) in wild birds. This simple, antigen-capture ELISA utilizes polystyrene immunosticks as the solid substrate, chicken antitoxin (IgY) as the coating antibody, rabbit antitoxin as the primary antibody, and peroxidase-labeled goat-anti-rabbit as the secondary...
Authors
Tonie Rocke, Susan Smith, Sean Nashold
The inhibition of Clostridium botulinum type C by other bacteria in wetland sediments The inhibition of Clostridium botulinum type C by other bacteria in wetland sediments
Bacteria with inhibitory activity against Clostridium botulinum type C were isolated from 32% of sediment samples (n = 1600) collected from 10 marshes in a northern California wetland over a 12 mo period. Aerobic and anaerobic bacteria with inhibitory activity were isolated from 12% and 23% of the samples, respectively. Bacteria with inhibitory activity were isolated from all 10 study...
Authors
Renee Sandler, Tonie Rocke, Thomas Yuill
Site-specific lead exposure from lead pellet ingestion in sentinel mallards Site-specific lead exposure from lead pellet ingestion in sentinel mallards
We monitored lead poisoning from the ingestion of spent lead pellets in sentinel mallards (Anas platyhrynchos) at the Sacramento National Wildlife Refuge (SNWR), Willows, California for 4 years (1986-89) after the conversion to steel shot for waterfowl hunting on refuges in 1986. Sentinel mallards were held in 1.6-ha enclosures in 1 hunted (P8) and 2 non-hunted (T19 and TF) wetlands. We...
Authors
Tonie E. Rocke, C. Brand, John Mensik
Use of sentinel mallards for epizootiologic studies of avian botulism Use of sentinel mallards for epizootiologic studies of avian botulism
Captive-reared mallards (Anas platyrhynchos) were used as sentinels to study the epizootiology of avian botulism at the Sacramento National Wildlife Refuge, Willows, California (USA) from 1986 to 1989. Sentinel mallards were wing-clipped, and 40 to 50 birds were confined in 1.6-ha enclosures in 11 selected wetlands (pools). Enclosures were searched intensively three to four times weekly...
Authors
Tonie E. Rocke, C. Brand
Seasonal prevalence of Clostridium botulinum type C in the sediments of the northern California wetland Seasonal prevalence of Clostridium botulinum type C in the sediments of the northern California wetland
The prevalence of Clostridium botulinum type C (% of positive sediment samples) was determined in 10 marshes at Sacramento National Wildlife Refuge (SNWR), located in the Central Valley of California (USA), where avian botulism epizootics occur regularly. Fifty-two percent of 2,200 sediment samples collected over an 18-mo period contained C. botulinum type C (both neurotoxic and...
Authors
Renee Sandler, Tonie E. Rocke, M.D. Samuel, Thomas Yuill
The role of avian carcasses in botulism epizootics The role of avian carcasses in botulism epizootics
No abstract available.
Authors
T.M. Reed, Tonie E. Rocke
Brain acetycholinesterase activity in botulism-intoxicated mallards Brain acetycholinesterase activity in botulism-intoxicated mallards
Brain acetylcholinesterase (AChE) activity in captive-reared mallards (Anas platyrhynchos) that died of botulism was compared with euthanized controls. AChE levels for both groups were within the range reported for normal mallards, and there was no significant difference in mean AChE activity between birds that ingested botulism toxin and died and those that did not.
Authors
Tonie E. Rocke, M.D. Samuel
Effects of lead shot ingestion on selected cells of the mallard immune system Effects of lead shot ingestion on selected cells of the mallard immune system
The immunologic effects of lead were measured in game-farm mallards (Anas platyrhynchos) that ingested lead shot while foraging naturally, mallards intubated with lead shot, and unexposed controls. Circulating white blood cells (WBC) declined significantly in male mallards exposed to lead by either natural ingestion or intubation, but not females. Spleen plaque-forming cell (SPFC) counts...
Authors
Tonie E. Rocke, M.D. Samuel
Blood lead concentrations in mallards from Delevan and Colusa National Wildlife Refuges Blood lead concentrations in mallards from Delevan and Colusa National Wildlife Refuges
Blood samples were taken from 181 (108 adult drakes and 73 individuals of mixed age and sex) mallards, Anas platyrhynchos, from Colusa and Delevan National Wildlife Refuges during late winter and summer of 1987. The percentage of birds with elevated lead concentration was 28.7 for late winter and 16.4 for late summer. For summer trapped birds, a significantly greater proportion of males...
Authors
David Mauser, Tonie Rocke, John Mensik, Christopher Brand
Experimental Mycoplasma gallisepticum infections in captive-reared wild turkeys Experimental Mycoplasma gallisepticum infections in captive-reared wild turkeys
The effects of Mycoplasma gallisepticum (MG) infections on egg production, fertility, and hatchability were studied in captive-reared wild turkeys (Meleagris gallopavo). Three groups of adult birds, each consisting of four hens and two toms, were exposed to MG by the respiratory route at the beginning of their breeding season. Fourteen control birds received sterile growth medium...
Authors
Tonie Rocke, Thomas Yuill, Terry Amundson
Hematozoan parasites of Rio Grande wild turkeys from southern Texas (USA) Hematozoan parasites of Rio Grande wild turkeys from southern Texas (USA)
One hundred twenty-three of 300 blood samples (41%) taken from Rio Grande wild turkeys (Meleagris gallopavo intermedia) from three locations in southern Texas (Welder Wildlife Refuge, Chaparrosa Ranch, and Campo Alegre Ranch) and subinoculated into domestic broad-breasted white turkey poults were positive for a Plasmodium (Novyella) sp. Analysis of blood films from 350 turkeys revealed
Authors
Marc Castle, Beth Christensen, Tonie Rocke