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Biomedical subjects

C M Hendrix

Publications and source records attributed to C M Hendrix.

28 records · Page 2Linked to original sources
PubMed1987

Visceral and subcutaneous acariasis caused by hypopi of Hypodectes propus bulbuci in the cattle egret.

Twenty-one of 24 adult male and female cattle egrets (Bubulcus ibis ibis) collected in Geneva County, Alabama had numerous white cyst-like structures (1,466 microns X 354 microns) found within the loose connective tissues of the skeletal muscles of the inguinal region, beneath the serosa of the proventriculus and in the heart beneath the epicardium (one adult male bird). These were identified as hypopi of Hypodectes (Hypodectoides) propus bulbuci. Histologic sections were prepared from the subcutis, proventriculus and heart. The histopathologic changes consisted of cross sections of mites surrounded by macrophages often containing basophilic or clear intracytoplasmic vacuoles and by plasma cells. A minimal fibrous encapsulation was rarely seen surrounding the mites.

Alabama↗
PubMed1987

Anthelmintic efficacy of ivermectin in naturally parasitized cats.

Ivermectin was administered per os [( PO]; n = 15) or subcutaneously [( SC]; n = 3) to naturally parasitized cats at 10 (n = 6), 100 (n = 6), or 300 (n = 6) micrograms/kg of body weight. Nontreated control cats were given sterile isotonic saline solution PO (n = 5) or SC (n = 1). Qualitative fecal examinations were performed on each cat 1 day before treatment and 14 days after treatment. Cats were euthanatized 14 days after treatment, at which time parasites from the gastrointestinal tracts were recovered, identified, and enumerated. Lungs and urinary bladders were examined histologically or by digestion (lungs only) for Capillaria spp and/or Aelurostrongylus abstrusus. Ivermectin was effective in removing Ancylostoma spp at all doses, but removal of Toxocara cati required 300 micrograms of ivermectin/kg. Efficacies against A abstrusus, Capillaria spp, and Physaloptera spp could not be determined definitively. Ivermectin had no effect on Dipylidium caninum, Hydatigera taeniaeformis, Spirometra mansonoides, or Isospora spp. Adverse reactions were not observed in cats given ivermectin PO; however, 3 cats given ivermectin SC reacted as though they experienced pain at the injection site.

Animals↗
PubMed1987

Efficacy of fenbendazole-medicated feed blocks against gastrointestinal nematode infections in calves.

An anthelmintic trial was conducted to determine the efficacy of fenbendazole (FBZ) incorporated into two types of feed blocks given daily for 3 or 10 days to calves naturally parasitized with gastrointestinal nematodes. Each treated calf consumed 5 mg of FBZ/kg of body weight. The FBZ was greater than 99% effective in removing adults of Haemonchus contortus, Ostertagia ostertagi, O lyrata, Cooperia punctata, C pectinata, C onchophora, Trichostrongylus axei, Bunostomum phlebotomum, and Oesophagostomum radiatum. Fenbendazole was also greater than 99% effective against immature nematodes recovered from the small intestine, which were thought to be mainly Cooperia spp. Efficacy was similar for FBZ in each of the two types of feed block carriers and for the 3- and 10-day regimens. Calves readily consumed feed blocks containing FBZ and did not have adverse reactions to FBZ.

Animal Feed↗
PubMed1986

Cerebral cuterebrosis in a dog.

A second instar Cuterebra larva was found in the thickened meninges of a 6-week-old female Doberman Pinscher at necropsy. The dog appeared blind and had chewing fits before death. Cerebral cuterebrosis in the dog is uncommon. This report briefly discusses the pathogenesis of the condition.

Animals↗
PubMed1986

Comparative efficacies of ivermectin, febantel, fenbendazole, and mebendazole against helminth parasites of gray foxes.

Anthelmintic efficacies of ivermectin, febantel, fenbendazole, and mebendazole were compared in 45 adult gray foxes (Urocyon cinereoargenteus) naturally infected with helminth parasites. Fecal specimens were examined one week before treatment and one week and 3 weeks after treatment with each anthelmintic, using a sucrose flotation technique. Compared with pretreatment, fewer foxes in all groups were infected with helminths one week and 3 weeks after treatment. Ivermectin, febantel, and fenbendazole more effectively eliminated helminths than did mebendazole. Parasites found were Ancylostoma sp, Capillaria aerophila, and Aelurostrongylus abstrusus and/or Filaroides osleri.

Animals↗
PubMed1986

Natural transmission of Dirofilaria immitis by Aedes aegypti.

The Liverpool strain of the mosquito Aedes aegypti was infected with microfilariae of the canine heartworm, Dirofilaria immitis, and was used to transmit heartworm larvae to three dogs. Methods of confirming heartworm infection in these dogs included the modified Knott's test, a commercial enzyme-linked-immunosorbent assay (ELISA), an indirect fluorescent antibody (IFA) test, and post-mortem examination.

Aedes↗
PubMed1986

Evaluation of three formulations of fenbendazole (10% suspension, 0.5% pellets, and 20% premix) against nematode infections in cattle.

Anthelmintic efficacies of 3 formulations of fenbendazole were evaluated in cattle naturally parasitized with nematodes: a 10% oral suspension, 0.5% pellets as a top dressing on feed, and a 20% premix. All formulations of fenbendazole were greater than 99% effective in removing adults of Haemonchus contortus, Ostertagia spp, Cooperia spp, and Oesophagostomum radiatum. Fenbendazole was greater than 96% effective in removing adults of Strongyloides papillosus and greater than 85% effective in the removal of Trichuris sp. Fenbendazole was greater than 96% effective against immature nematodes, which were thought to be primarily Cooperia spp. Adverse reactions were not observed in calves treated with the 3 formulations of fenbendazole.

Animals↗
PubMed1980

Natural transmission of Dirofilaria immitis by Aedes vexans.

Aedes vexans mosquitoes were reared in the laboratory from field-collected fourth instar larvae. Mosquitoes were allowed to feed on dogs which were infected with Dirofilaria immitis and then the mosquitoes were housed in an environmental chamber with an ambient air temperature of approximately 26 C and a relative humidity of approximately 80%. Incandescent lighting was used to simulate daylight. On the 17th, 19th, 21st, and 28th day after their infected blood meal, the mosquitoes were allowed to feed on five microfilaria-negative dogs which had been reared in mosquito-free environments. Blood from four of the five exposed dogs became positive for microfilariae of D immitis in an average of 272 days after the feeding. The local strain of A vexans was established as a vector of canine heartworm disease in the Minneapolis-St. Paul metropolitan area.

Aedes↗