Results 81 to 90 of about 13,960 (198)

INFECCIÓN POR RICKETTSIAS EN EL NOROESTE DE ARGENTINA

Revistas Argentina de Medicina, 2018
Las rickettsias son entidades clínicas emergentes y reemergentes del tipo zoonótico, de la familia Rickettsiaceae. Son un género de bacterias intracelulares obligadas transmitidas por diferentes vectores artrópodos hematófagos como garrapatas, pulgas ...
Alejandra P Sánchez, Mauricio Herrera Verduguez, Claudia Caucota, Marisa Ortega, Marianela Borgatta, Ricardo A León de la Fuente   +5 more
doaj   +2 more sources

Ecological dynamics of blacklegged ticks, vertebrate hosts, and associated zoonotic pathogens in northeastern forests

Ecosphere, Volume 16, Issue 12, December 2025.
Abstract Specific host‐tick interactions in temperate forest systems influence variation in density and infection prevalence of nymphal blacklegged tick (Ixodes scapularis). The density of infected nymphs (DIN), which is the product of nymphal infection prevalence (NIP) and density of questing nymphs (DON), influences the risk of human exposure to tick‐
Shannon L. LaDeau, Kelly Oggenfuss, Alexander Schmidt, Saravanan Thangamani, Richard S. Ostfeld   +4 more
wiley   +1 more source

Automated identification of spotted‐fever tick vectors using convolutional neural networks

Medical and Veterinary Entomology, Volume 39, Issue 4, Page 829-841, December 2025.
We evaluate the performance of convolutional neural networks (CNN) AlexNet, ResNet‐50 and MobileNetV2 for the automated identification of tick species capable of transmitting spotted fever. CNNs achieved accuracy rates of ~90% in identifying ticks and showed sensitivities of 59%–100% according to species, sex, position or image resolution.
Isadora R. C. Gomes, Vinícius L. Miranda, José Fabrício C. Leal, Igor P. Oliveira, Paula J. Silva, Karla Bitencourth, Claudio M. Rodrigues, Liege R. Siqueira, Marcelo B. Labruna, Gilberto S. Gazeta, Marinete Amorim, Rodrigo Gurgel‐Gonçalves   +11 more
wiley   +1 more source

Febre maculosa: isolamento de Rickettsia em amostra de biópsia de pele Spotted fever: Rickettsia isolation in skin biopsy sample

Revista do Instituto de Medicina Tropical de São Paulo, 1992
Presença de Rickettsia na pele de doente de Febre Maculosa foi evidenciada por inoculação intraperitoneal em cobaio. O diagnóstico sorológico por imunoflüorescência indireta revelou diferença de título de anticorpos específicos para Rickettsia rickettsii,
Heloisa Helana B. Melles, Silvia Colombo, Marcos Vinícius da Silva   +2 more
doaj   +1 more source

Zoonotic Disease Transmission May Be Linked to Host Co‐Occurrence Network Topology

Annals of the New York Academy of Sciences, Volume 1554, Issue 1, Page 110-120, December 2025.
A global analysis of zoonotic host co‐occurrence networks identified 22 networks from five continents (A) and 87 hosts from 16 orders of mostly birds but also mammals (B) as having a high potential for disease transmission. ABSTRACT Most human pathogens are zoonotic, transmitted from vertebrate hosts to humans.
Patrick T. Stillson, Brent B. Crow, William R. Budnick, Sophia I. Passy   +3 more
wiley   +1 more source

Study of infection by Rickettsiae of the spotted fever group in humans and ticks in an urban park located in the City of Londrina, State of Paraná, Brazil

Revista da Sociedade Brasileira de Medicina Tropical, 2011
INTRODUCTION: Spotted fevers are emerging zoonoses caused by Rickettsia species in the spotted fever group (SFG). Rickettsia rickettsii is the main etiologic agent of Brazilian spotted fever (BSF) and it is transmitted by Amblyomma spp. ticks.
Roberta Santos Toledo, Katia Tamekuni, Mauro de Freitas Silva Filho, Valeska Bender Haydu, Richard Campos Pacheco, Marcelo Bahia Labruna, John Stephen Dumler, Odilon Vidotto   +7 more
doaj   +1 more source

Canine Spotted Fever Group Rickettsial Seroprevalence as an Indicator for Human Rocky Mountain Spotted Fever Case Rates in Arizona, USA

Zoonoses and Public Health, Volume 72, Issue 8, Page 697-705, December 2025.
ABSTRACT Introduction Rocky Mountain spotted fever (RMSF), a rapidly progressing febrile disease caused by the bacterium Rickettsia rickettsii, is the deadliest tick‐borne disease in the world. Human infection initially results in non‐specific symptoms and, if untreated, can result in death in up to 35% of cases.
Alec Oliva, Rachael Kreisler, Andrea Romkema, Soren Madsen, Haley Furman, Christopher Maag, Charles Schaefer, Jose A. Hernandez, Jung Keun Lee, Michael Quinlan, John VandenBrooks   +10 more
wiley   +1 more source

EXPOSIÇÃO A RICKETTSIA BELLII REDUZ A CAPACIDADE AMPLIFICADORA DE RICKETTSIA RICKETTSII PARA CARRAPATOS AMBLYOMMA SCULPTUM EM COBAIAS

, 2023
Introdução e objetivo: No estado de São Paulo as capivaras são as principais hospedeiras amplificadoras da Rickettsia rickettsii, agente etiológico da febre maculosa brasileira (FMB), para o carrapato vetor Amblyomma sculptum.
Marcelo Bahia Labruna, Herbert Sousa Soares, Talita Beck Strabelli dos Santos, Lina de Campos Binder, Carlos Eduardo Camargo Fanchini   +4 more
core   +1 more source

Brazilian spotted fever in cart horses in a non-endemic area in Southern Brazil Febre maculosa brasileira em cavalo de carroceiro em área não-endêmica no Sul do Brasil

Revista Brasileira de Parasitologia Veterinária, 2010
Brazilian Spotted Fever (BSF) is an often fatal zoonosis caused by the obligate intracellular bacterium Rickettsia rickettsii. The disease is generally transmitted to humans by Amblyomma spp. ticks. Serological evidence of past infection by R. rickettsii
Marta Cristina Diniz de Oliveira Freitas, Marcelly Grycajuk, Marcelo Beltrão Molento, José Bonacin, Marcelo Bahia Labruna, Richard de Campos Pacheco, Jonas Moraes-Filho, Ivan Deconto, Alexander Welker Biondo   +8 more
doaj   +1 more source

A Case of Illness Following a Bite by a Male Lone Star Tick (Amblyomma americanum Linnaeus) Infected With Ehrlichia sp. and Rickettsia amblyommatis in Connecticut, United States

Clinical Case Reports, Volume 13, Issue 9, September 2025.
A case of local lymphadenopathy and a flu‐like illness in a man, following a bite by a male lone star tick infected with Ehrlichia sp. and Rickettsia amblyommatis. ABSTRACT The lone star tick (Amblyomma americanum Linnaeus) is a species commonly found in the southeastern U.S., but in recent years its populations have expanded northward, resulting in an
Noelle Khalil, Abigail Chang, Lorelei Sandland, Henry M. Feder Jr., Goudarz Molaei   +4 more
wiley   +1 more source