The incidence of canine haematozoa in Peninsular Malaysia.

In 3 urban areas in Selangor, Peninsular Malaysia between 1973 and 1981, blood from 4084 dogs was examined for haematozoa. The following frequencies were found: Babesia gibsoni 17.7%; microfilariae of Dirofilaria immitis 9.6%; Hepatozoon canis 1.2%; B. canis 1.1%; Ehrlichia canis 0.2%; Trypanosoma evansi 0.1%. A detailed examination of B. gibsoni infections and microfilariasis due to D. immitis with regards to monthly distribution, breed frequency, sex and age, revealed that pedigree and non-pedigree dogs were equally susceptible to Babesia and microfilariae infections.

Research into the relative importance of Tabanidae (Diptera) in mechanical disease transmission. IV. A contribution to the epidemiology of bovine trypanosomiasis in Africa.

The incidence of trypanosomiasis was studied in a herd of dairy cattle near Dar es Salaam over a period of 4 months. The apparent density of tsetse flies and prevalence of various species of Tabanidae were measured. There was no statistical correlation between the disease incidence and the seasonal occurrence of Tabanidae. Although anaplasmosis was concurrently transmitted by Tabanus taeniola on an economically significant scale in this herd and there was a high incidence of Trypanosoma vivax infections it was thought, however, that trypanosomes were transmitted by Tabanidae at an insignificant rate. The only measureable result of such mechanical transmission was a change of the T. vivax/T. congolense ratio in favour of T. vivax (69 per cent of the infections).