Elsevier

Experimental Parasitology

Volume 15, Issue 6, December 1964, Pages 527-555
Experimental Parasitology

Original research paper
Cyclic development and longevity of Theileria parva in the tick Rhipicephalus appendiculatus

https://doi.org/10.1016/0014-4894(64)90045-1Get rights and content

Abstract

Full details of the technical methods evolved in the study of Theileria parva in the tick Rhipicephalus appendiculatus are described. Stages of T. parva discovered in intestinal contents, gut epithelial cells, and the cells of the salivary glands are fully described. Only the stages of the parasite found in the salivary glands and ducts could definitely be said to be a part of the normal life cycle of T. parva. Multiplication occurred in this site by a process of multiple fission. No sexual stages were discovered. Salivary gland inclusions of T. lawrencei (South African strain) were similar to those of T. parva.

The many sources of error that have confused earlier workers are fully discussed.

Studies on the longevity of T. parva in its tick vector confirmed the fact that the contained parasites die before the tick. Ticks become noninfective within 34–40 weeks after molting but are capable of feeding up to 15 months. It was found that ticks infected with T. parva could transmit the parasite to cattle 24 hours after being placed on the host.

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  • Cited by (0)

    This investigation was supported in part by two Fulbright Awards and research grant E-2950 from the National Institute of Allergy and Infectious Diseases, National Institute of Health, United States Public Health Service.

    2

    Present address: Laboratory of Parasitology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pa., U.S.A.

    3

    Present address: Department of Animal Pathology, Madingley Road, Cambridge, England.

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