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variation amongst the neutralizing epitopes of bluetongue viruses isolated in the united states in 1979-1981.neutralizing epitopes present on field isolates of bluetongue virus (btv) serotypes 10, 11, 13 and 17 were evaluated with a panel of polyclonal and neutralizing monoclonal antibodies (mabs). a total of 91 field isolates were evaluated, including 15 isolates of btv-10, 29 isolates of btv-11, 26 isolates of btv-13, and 21 isolates of btv-17. the viruses were isolated from cattle, goats, sheep, elk and deer in idaho, louisiana, nebraska and, predominantly, california, in the years 1979, 1980 and 19 ...19921379766
survey of eimeria spp. oocysts in feces from louisiana state university ewes.the prevalence and identification of eimeria spp. in the louisiana state university ewe flock were determined from 109 fecal samples. unsporulated oocysts were recovered from 94 of the samples and 1208 oocysts representing ten species of eimeria were identified: e. ahsata, e. crandallis, e. faurei, e. granulosa, e. intricata, e. ovina, e. ovinoidalis, e. pallida, e. parava and e. punctata. eimeria ovinoidalis, which is probably the most pathogenic, was the species common to the most number of sa ...19911763483
delayed phalaris grass toxicosis in sheep and cattle.a phalaris grass (phalaris caroliniana) caused neurologic signs and lesions in cattle and sheep. the sheep were hyperexcitable and uncoordinated, with severe muscle twitching, stiff gait, and head nodding. the cattle were thin, nervous, and ataxic. one feature of chronic phalaris toxicosis in these cases was onset of signs weeks or months after removal of the animals from the forage.19892768059
identification and characterization of bahia grande, reed ranch and muir springs viruses, related members of the family rhabdoviridae with widespread distribution in the united states.sixteen virus isolates with similar biological characteristics were obtained from salt-marsh mosquitoes collected in south texas in 1974. when compared antigenically, these and 13 other isolates from mosquitoes collected between 1972 and 1979 in west texas, new mexico, louisiana, colorado and north dakota were shown to be related but not identical. three distinct serotypes were determined: bahia grande (prototype strain tb4-1054), reed ranch (tb4-222) and muir springs (76v-23524). when examined ...19862872270
efficacy of levamisole and netobimin against haemonchus contortus in lambs in louisiana.efficacy of levamisole was evaluated in a suspected levamisole-resistant population of haemonchus contortus in the louisiana state university sheep flock. the efficacy of netobimin also was evaluated against this population of haemonchus. in trial 1, 5 lambs naturally infected with h contortus were given 8 mg of levamisole/kg of body weight as a drench, and 5 lambs were not treated (controls). nematode recovery after slaughter indicated 0% efficacy against h contortus. in trial 2, 30 nematode-fr ...19873662209
prevalence of bluetongue viral antibodies in louisiana goats. 19816278995
bluetongue infections in louisiana cattle.bluetongue virus (btv) serotype 17 was isolated from cattle with clinical signs of bluetongue disease during 1978 and 1979 epizootics. bovine sera from 6 herds located in an epizootic region were examined in 1979 for antibodies, using an immunodiffusion (id) test. of 300 sera, 164 (54.7%) were seropositive. sera from statewide surveys of louisiana cattle in july to august 1980 and december 1980 to january 1981 were tested for btv antibodies, using the id test. fifty-eight of 70 herds (82.9%) and ...19826283967
prevalence of bovine herpesvirus-1, bovine viral diarrhea, parainfluenza-3, goat respiratory syncytial, bovine leukemia, and bluetongue viral antibodies in sheep.sera from healthy sheep were collected in january and march 1982 from flocks of sheep located in southwestern and southeastern louisiana. these sera were tested for bovine herpesvirus-1 (bhv-1), bovine viral diarrhea virus (bvdv), parainfluenza-3 (pi-3) virus, and goat respiratory syncytial virus (grsv) antibodies by microtitration virus-neutralization test. the sera were tested also for bovine leukemia virus (blv) and bluetongue virus (btv) antibodies by immunodiffusion tests. the number of flo ...19846329044
ivermectin resistant haemonchus contortus in louisiana lambs.fifteen weaned crossbred (suffolk x louisiana native) lambs were treated with albendazole (10 mg kg-1) to remove existing nematode infections. they were inoculated with haemonchus contortus infective larvae from a residual population surviving treatment with the oral formulation of ivermectin (0.2 mg kg-1). one group of five lambs remained untreated, another group of five was treated with the injectable formulation of ivermectin (0.2 mg kg-1), and a third group of five was treated with the oral ...19947725627
bluetongue virus in sheep and cattle and culicoides variipennis and c. stellifer (diptera: ceratopogonidae) in louisiana.the transmission of bluetongue virus (blu) to sheep and cattle relative to culicoides abundance and infection was studied in two areas of the louisiana state university agricultural center, baton rouge, la. the seroprevalence of blu in beef cattle was 70.5% in 1989 and 37.0% in 1990; 2 of 37 animals tested in both years became positive, indicating active transmission. the prevalence of blu in sheep decreased from 52.2% in 1989 to 34% in 1990; seroconversion was not detected. serotypes of positiv ...19938395602
epidemiology of gastrointestinal nematode parasitism in suffolk and gulf coast native sheep with special emphasis on relative susceptibility to haemonchus contortus infection.an eight-year study was conducted to define the epidemiology of gastrointestinal nematode infection in suffolk and gulf coast native (native) breeds of sheep, and to determine if the native sheep is more resistant to infection. for the initial three years, each breed grazed separate pastures where anthelmintic treatments were administered to individual animals on a salvage basis. for the last five years, both breeds grazed concurrently; anthelmintic treatments were administered to individual ani ...19989493310
epidemiological observations and heterosis analysis of gastrointestinal nematode parasitism in suffolk, gulf coast native, and crossbred lambs.a crossbreeding program was conducted to evaluate the resistant status to gastrointestinal nematode parasite infection in crossbred (f1) lambs and their suffolk and gulf coast native (native) breed counterparts. a total of 253 lambs were included in the study over 2 years. fecal egg count (fec) and blood packed cell volume (pcv) of 18-20 monitor lambs of each breed group in each year were collected every other week from birth to 24-30 weeks of age. the fec and pcv of all lambs were determined at ...200111423185
validation of the famacha eye color chart for detecting clinical anemia in sheep and goats on farms in the southern united states.recent studies on sheep and goat farms in the southern united states indicate that multiple-anthelmintic resistance in haemonchus contortus is becoming a severe problem. though many factors are involved in the evolution of resistance, the proportion of the parasite population under drug selection is believed to be the single most important factor influencing how rapidly resistance develops. therefore, where prevention of resistance is an important parallel goal of worm control, it is recommended ...200415265575
quality and freezing qualities of first and second ejaculates collected from endangered gulf coast native rams.the gulf coast native sheep, or louisiana native sheep, is an endangered previously feral domestic sheep population of european origin that has been under natural selection pressure for reproductive survival in their transplanted range while roaming in the southern gulf coast region of the united states. this sheep population has an increased natural resistance to internal parasites, breeds year-around and has a greater percentage of live lambs as compared with other breeds of sheep raised in si ...200616289553
survey for vesicular stomatitis virus neutralizing antibodies in serums of white-tailed deer odocoileus virginianus of the southeastern united states.new jersey type vesicular stomatitis (vs) antibodies were found in 14 of 677 deer serums tested by neutralization tests in embryonated chicken eggs. twelve positive serums were received from louisiana and two from georgia. eight of the positive deer serums from louisiana were collected in the area of the only reported case of vs during 1967. clinical vs has not been diagnosed in the east coast states since 1964. two positive deer serums were collected on ossabaw island, georgia, and three positi ...197016512162
first report of bluetongue virus serotype 1 isolated from a white-tailed deer in the united states.in november 2004, tissues were collected from a hunter-killed white-tailed deer in st. mary parish, louisiana. bluetongue virus (btv) was isolated from the tissues; however, the isolate could not be identified as any of the us domestic serotypes. subsequent testing by virus neutralization using serotype-specific antiserum tentatively identified the isolate as btv serotype 1 (btv-1), which had not previously been found in the united states. primers were designed based on the sequence of an outer ...200616921883
accuracy of the famacha system for on-farm use by sheep and goat producers in the southeastern united states.famacha is a practical on-farm system designed to provide small ruminant producers a tool for improving their management of haemonchus contortus infections. although this system has become very popular and widely accepted by small ruminant producers in many regions of the southern united states, there is very limited data reported on the effectiveness of the famacha system when performed by farmers. the objective of this study was to evaluate the accuracy of the famacha system for on-farm use by ...200717482368
cryptosporidiosis outbreaks associated with recreational water use--five states, 2006.cryptosporidiosis is a gastrointestinal illness caused by parasitic protozoa of the genus cryptosporidium and can produce watery diarrhea lasting 1-3 weeks; one or two cases per 100,000 population are reported annually in the united states. fecal-oral transmission of cryptosporidium oocysts occurs through ingestion of contaminated drinking or recreational water, consumption of contaminated food, and contact with infected persons or animals (e.g., cattle or sheep). unlike bacterial pathogens, cry ...200717657205
detection of bluetongue virus rna in field-collected culicoides spp. (diptera: ceratopogonidae) following the discovery of bluetongue virus serotype 1 in white-tailed deer and cattle in louisiana.in november 2004, bluetongue virus (family reoviridae, genus orbivirus, btv) serotype 1 (btv-1) was detected for the first time in the united states from a hunter-killed deer in st. mary parish, la. in 2005, sera surveys were conducted on three cattle farms near the area where the deer was found, and btv-1-seropositive cattle were found on two of the three farms; in 2006, sera surveys from the cattle on the three farms did not detect any btv-1-positive animals. the purpose of this study was to s ...201020380309
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