SUMMARYOesophagus samples from 714 cattle from Western Australia were examined by artificial digestion to detect the presence of Sarcocystis spp. The overall prevalence of infection was 52%. The prevalence of infection increased with age and was highest in the entire males (92%). The prevalence was lower in cattle which originated from arid and semiarid regions (9 and 31 % respectively) than those from tropical (87%) and temperate (60%) regions. Possible reasons for these differences are discussed and it is concluded that environmental and management factors as well as host age and sex influence the prevalence of infection with Sarcocystis spp. in cattle.
Anafilaroides rostratus Gerichter, 1949 a nematode found in the lungs of cats in Palestine and Ceylon, and its first stage larvae are described. Studies on the biology of the first stage larvae indicate that it is easily destroyed by adverse conditions.
The family Filaroididae Schulz, 1951 is defined and reclassified into five subfamilies, viz.: Filaroidinae Skrjabin, 1933; Angiostrongylinae Bohm and Gebauer, 1934; Vogeloidinae Dougherty, 1951; Oslerinae Khera, 1954; and Marsupostrongylinae subfam. nov. Definitions of the last two sub-families are given and the familial relationships of the Filaroididae are discussed. All species in the Filaroididae are listed and a key is given to its sub-families and genera.
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