The control of gastrointestinal nematodes (GINs) in small ruminants is principally dependent on anthelmintic therapy, which encounters the rising problem of anthelmintic resistance (AR) development. Veterinarians reported anthelmintic failure in several sheep farms in Arbat District, Sulaymaniyah, northern Iraq, which called for a systematic study about the efficacy of three commonly used drugs: albendazole, ivermectin, and levamisole.

This study presents two clinical cases in Chinchilla and Himalayan rabbits, exhibiting symptoms such as alopecia, skin lesions, and ear lesions. Skin scrapings and fecal samples were collected and processed, revealing the presence of Sarcoptes scabiei mites, Psoroptes cuniculi mites, and Eimeria oocysts. Treatment involved subcutaneous administration of Ivermectin (0.2 mg/kg), accompanied by supportive and topical application of Benzyl benzoate. The rabbits displayed clinical improvement, with complete recovery observed within 30 days.

An outbreak of chorioptic mange infestation was observed in a sheep and goat flock during 2021 in the Kandukur village of Anantapur district, with a history of skin itching, thick scabs and loss of hair. Skin lesions were characterized by alopecica, crusty scabs on hind limbs, face, ears and scrotal region. Microscopic examination of deep skin scrapings revealed the presence of Chorioptes spp mites. Affected sheep and goats were treated with Ivermectin injection (200 mg/kg. body wt) administered subcutaneously weekly once for 2 weeks along with dipping using Butox spray (Deltamethrin) and supportive therapy with brotone syrup (liver tonic). Examination of deep skin scraping two weeks post treatment found negative for the Chorioptes spp mites.

Antiviral activity of ivermectin was examined against R2B strain of Newcastle disease virus in 9 - day old embryonated chicken eggs. Five distinct concentrations (500, 250, 100, 50, 10 µg/mL) of ivermectin were used in the study. Haemagglutination test was performed to determine the antiviral activity of ivermectin by using chicken RBC. The results revealed that ivermectin can exert a significant antiviral activity against Newcastle disease virus at higher concentrations (500, 250 and 100 µg/ml) but with cytotoxic effects. On the contrary a moderate to weak antiviral activity without cytotoxicity was demonstrated at lower concentrations (50, 10 µg/ml).

A female Ongole calf aged one year and nine months was found to have nodular development around the left eye and neck region. Clinical examination revealed that the calf had cutaneous papilloma (wart), which was treated with autohemotherapy, ivermectin and levamisole injections along with placement of a ligature around wart's base. On the third day of treatment, a large papilloma on the left lower eyelid dried up and sloughed off. On the tenth day of therapy, the warts on the upper eyelid and neck began to dry and flake off, leaving behind barely visible scars at the original growth sites. The animal underwent an uncomplicated recovery and completely recovered from the ailment.

A three-month-old female New Zealand White Rabbit, weighing about 1.4 kg was brought to the Veterinary Clinical Complex, Veterinary College and Research Institute, Tirunelveli with ahistory of intense pruritis and alopecia all over the body. Clinical observation revealed crusty lesions on the nose,ear margin and toes. Microscopic examination of the deep skin scraping revealed the presence of Psoroptes cuniculi mite. The rabbit was treated with an injection Ivermectin @ 0.4 mg/kg sub-cutaneous and an injection of Chlorpheniramine maleate @ 0.4 mg/kg intramuscular and further advised the owner to give HITEK® oral solution (Ivermectin) @ 0.4 mg/kg PO once a week and Benzyl benzoate I.P. solution topically daily for a continuous period of one month along with multivitamin supplementation (Multistar pet®) @ 2 ml PO BID. The rabbit recovered successfully without any drug side effects (Tandem usage of ivermectin and Benzyl Benzoate).

Prevalence and anthelmintic resistance status of gastrointestinal nematodes in 430 sheep investigate by faecal examination was conducted in Qushtapa, Khabat, Benslawa, Salahaddin subdistricts in Erbil, from April to July 2012. The mean eggs per gram (EPG) count determined by using modified McMaster technique, showed that (40.46%) of the sheep were infested, the higher infection was 17.2% Nematodirus spp., 13.02% Strongylus spp., 4.18% Marshaligia spp., 2.79% Trichurus spp. and 3.25% with coccidia. Four farms were selected randomly each divided to control and three treatment groups: Levamisol, Albendazole and Ivermectin groups. Anthelmintic efficacy was measured after treatment dates were investigated with faecal egg count reduction test, the FECRT percentage for Levamisol in sheep ranged from 80.3 to 94.7 which show most effective in Khabat with FECRT of 94.7% while with Albendazole ranged from 75.5% to 80.2%, suspected resistant in all group, but the injectable Ivermectin in sheep ranged from 85.2 to 94.8 and show effective in Bnaslawa and Salahaddin with FECR of 94.6% and 94.8% respectively. All the anthelmintic were found to be low effective, but resistance to Albendazole was suspected. Based on the findings, it was concluded that development of anthelmintic resistance could be prevented by avoiding frequent dosing and under dosing, while strategic deworming should be practiced by both animal health workers and animal owners.

Dirofilaria (D.) immitis is an important canine parasitic nematode in dogs. D. immitis parasitizes the right ventricle and pulmonary artery of dogs. An ivermectin and pyrantel pamoate compound (IPPC) was administered to dogs naturally infected with this parasite. IPPC is composed of 68.0, 136.0 and 272.0 ㎍ of ivermectin and 57.0, 114.0 and 227.0 mg pyrantel pamoate for small, middle, and large animals. Ivermectin has activity against nematodes and ectoparasites in dogs. Pyrantel pamoate is also effective against nematodes in dogs. Our results showed that this drug combination has good efficacy in D. immitis infected dogs.

Experimental Trichinella zimbabwensis infections were established in three baboons (Papio sp.) and four vervet monkeys (Cercopithecus aethiops) and the clinical-pathological manifestations assessed. The infected animals showed clinical signs ranging from fever, diarrhoea, periorbital oedema and muscular pain in varying degrees. One baboon became blind due to the infection. Levels of creatinine phosphokinase and lactate dehydrogenase increased to reach a peak on Day 42 post-infection (pi) for both baboons and monkeys. Blood parameters such as packed cell volume, levels of red blood cells and white blood cells did not change significantly from the normal ranges except for the levels of eosinophils which peaked above the normal ranges at Day 28 and 56 pi in baboons and at Day 56 pi in monkeys. Two baboons and two monkeys died during the course of the experiment. They were emaciated and showed lesions such as ascites, hydropericardium, congested liver and enlarged gall bladder. Histopathological findings of various muscles included a basophilic transformation of muscle cells, the disappearance of sarcomere myofibrils and basophilic sarcoplasm with the presence of Trichinella larvae in the sarcoplasm. These changes were mainly in the massetter and were of various intensities in the tail, gastrocnemius and biceps muscles. Five consecutive treatments with an oxfendazole-levamisole combination on surviving animals failed to clear the infection whereas ivermectin cleared the infection after one treatment in two monkeys and after two treatments in a baboon.