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Rickettsia rickettsii Co-feeding Transmission among Amblyomma aureolatum Ticks

Amblyomma aureolatum ticks are vectors of Rickettsia rickettsii, the etiologic agent of Rocky Mountain spotted fever in Brazil. Maintenance of R. rickettsii in nature depends on horizontal transmission along tick generations. Although such transmission is known to occur when uninfected and infected...

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Autores principales: Moraes-Filho, Jonas, Costa, Francisco B., Gerardi, Monize, Soares, Herbert S., Labruna, Marcelo B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Centers for Disease Control and Prevention 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6200015/
https://www.ncbi.nlm.nih.gov/pubmed/30334709
http://dx.doi.org/10.3201/eid2411.180451
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author Moraes-Filho, Jonas
Costa, Francisco B.
Gerardi, Monize
Soares, Herbert S.
Labruna, Marcelo B.
author_facet Moraes-Filho, Jonas
Costa, Francisco B.
Gerardi, Monize
Soares, Herbert S.
Labruna, Marcelo B.
author_sort Moraes-Filho, Jonas
collection PubMed
description Amblyomma aureolatum ticks are vectors of Rickettsia rickettsii, the etiologic agent of Rocky Mountain spotted fever in Brazil. Maintenance of R. rickettsii in nature depends on horizontal transmission along tick generations. Although such transmission is known to occur when uninfected and infected ticks feed simultaneously on susceptible animals (co-feeding systemic transmission), we investigated co-feeding nonsystemic transmission, which was based on R. rickettsii–infected and –uninfected A. aureolatum ticks feeding simultaneously on guinea pigs immune to R. rickettsii. Our acquisition and transmission infestations demonstrated that horizontal transmission of R. rickettsii by co-feeding ticks on immune hosts with no systemic infection did not occur when uninfected larvae fed distantly from infected nymphs but did occur in a few cases when uninfected larvae fed side-by-side with infected nymphs, suggesting that they shared the same feeding site. The co-feeding nonsystemic transmission type might have no epidemiologic importance for Rocky Mountain spotted fever.
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spelling pubmed-62000152018-11-08 Rickettsia rickettsii Co-feeding Transmission among Amblyomma aureolatum Ticks Moraes-Filho, Jonas Costa, Francisco B. Gerardi, Monize Soares, Herbert S. Labruna, Marcelo B. Emerg Infect Dis Research Amblyomma aureolatum ticks are vectors of Rickettsia rickettsii, the etiologic agent of Rocky Mountain spotted fever in Brazil. Maintenance of R. rickettsii in nature depends on horizontal transmission along tick generations. Although such transmission is known to occur when uninfected and infected ticks feed simultaneously on susceptible animals (co-feeding systemic transmission), we investigated co-feeding nonsystemic transmission, which was based on R. rickettsii–infected and –uninfected A. aureolatum ticks feeding simultaneously on guinea pigs immune to R. rickettsii. Our acquisition and transmission infestations demonstrated that horizontal transmission of R. rickettsii by co-feeding ticks on immune hosts with no systemic infection did not occur when uninfected larvae fed distantly from infected nymphs but did occur in a few cases when uninfected larvae fed side-by-side with infected nymphs, suggesting that they shared the same feeding site. The co-feeding nonsystemic transmission type might have no epidemiologic importance for Rocky Mountain spotted fever. Centers for Disease Control and Prevention 2018-11 /pmc/articles/PMC6200015/ /pubmed/30334709 http://dx.doi.org/10.3201/eid2411.180451 Text en https://creativecommons.org/licenses/by/4.0/This is a publication of the U.S. Government. This publication is in the public domain and is therefore without copyright. All text from this work may be reprinted freely. Use of these materials should be properly cited.
spellingShingle Research
Moraes-Filho, Jonas
Costa, Francisco B.
Gerardi, Monize
Soares, Herbert S.
Labruna, Marcelo B.
Rickettsia rickettsii Co-feeding Transmission among Amblyomma aureolatum Ticks
title Rickettsia rickettsii Co-feeding Transmission among Amblyomma aureolatum Ticks
title_full Rickettsia rickettsii Co-feeding Transmission among Amblyomma aureolatum Ticks
title_fullStr Rickettsia rickettsii Co-feeding Transmission among Amblyomma aureolatum Ticks
title_full_unstemmed Rickettsia rickettsii Co-feeding Transmission among Amblyomma aureolatum Ticks
title_short Rickettsia rickettsii Co-feeding Transmission among Amblyomma aureolatum Ticks
title_sort rickettsia rickettsii co-feeding transmission among amblyomma aureolatum ticks
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6200015/
https://www.ncbi.nlm.nih.gov/pubmed/30334709
http://dx.doi.org/10.3201/eid2411.180451
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