Lack of infectivity of a Brazilian Anaplasma marginale isolate for Boophilus microplus ticks

Previous studies have shown that one Brazilian Anaplasma marginale isolate presents an inclusion appendage (tail), while other isolates do not present such inclusion. Studies on tick transmission have been carried out with tailless isolates but little is known about transmission of tailed isolates b...

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Bibliographic Details
Published in:Veterinary parasitology 2005-03, Vol.128 (3), p.325-331
Main Authors: Ruiz, Patrícia M. Gonçalves, Passos, Lygia M. Friche, Barbosa Ribeiro, Múcio F.
Format: Article
Language:English
Subjects:
Anaplasma marginale
Anaplasma marginale - isolation & purification
Anaplasma marginale - pathogenicity
Anaplasma marginale - ultrastructure
anaplasmosis
Anaplasmosis - microbiology
Anaplasmosis - transmission
Animals
Boophilus microplus
Brazil
calves
Cattle
Cattle Diseases - microbiology
Cattle Diseases - parasitology
Cattle Diseases - transmission
Digestive System - parasitology
disease transmission
disease vectors
Erythrocytes - microbiology
Female
Hematocrit - veterinary
Inclusion appendage
infection
Infectious Disease Transmission, Vertical
Ixodidae
Ixodidae - growth & development
Ixodidae - microbiology
Male
nonpathogenic strains
pathogenicity
Salivary Glands - parasitology
Tick transmission
ticks
vector competence
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Summary:Previous studies have shown that one Brazilian Anaplasma marginale isolate presents an inclusion appendage (tail), while other isolates do not present such inclusion. Studies on tick transmission have been carried out with tailless isolates but little is known about transmission of tailed isolates by Boophilus microplus. Two splenectomized calves were experimentally inoculated with the tailed A. marginale isolate. During ascending rickettsemia, B. microplus larvae, free from hemoparasites, were fed on the calves and the resulting nymphs, adult males and engorged females were examined by optic and electronic microscopy. No A. marginale colonies were observed in the gut cells of engorged females and the larvae originated from them did not transmit A. marginale to susceptible calves. In addition, no colonies of A. marginale were seen in the gut cells or in salivary glands of adult males and nymphs. These results suggest that B. microplus is not the biological vector for this tailed isolate.
ISSN:0304-4017
1873-2550
DOI:10.1016/j.vetpar.2004.11.017