Results 71 to 80 of about 4,543 (198)

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

In vitro guinea pig leukocyte reactions to Rickettsia rickettsii [PDF]

Infection and Immunity, 1977
The presence of cell-mediated immunity in Rocky Mountain spotted fever-infected guinea pigs was determined by two in vitro assays: whole blood lymphocyte transformation (LT) and macrophage migration inhibition. Increased LT was detected as early as 1 week in guinea pigs infected with Rickettsia rickettsii and treated with oxytetracycline and was ...
R H, Kenyon, M S, Ascher, R A, Kishimoto, C E, Pedersen   +3 more
openaire   +2 more sources

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

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

Rickettsia rickettsiiinAmblyomma patinoiTicks, Colombia [PDF]

Emerging Infectious Diseases, 2015
Para el editor: Rickettsia rickettsii es el agente etiológico de la fiebre maculosa de las Montañas Rocosas (RMSF), una rickettsiosis transmitida por garrapatas altamente letal restringida al hemisferio occidental (1,2). En Colombia, R. rickettsii se informó por primera vez durante la década de 1930, cuando 62 (95%) de 65 personas afectadas murieron de
Álvaro A. Faccini‐Martínez, Francisco B. Costa, Tatiana E. Hayama-Ueno, Alejandro Ramírez-Hernández, Jesús A. Cortés-Vecino, Marcelo B. Labruna, Marylin Hidalgo   +6 more
openaire   +3 more sources

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

In vitro susceptibilities of Coxiella burnetii, Rickettsia rickettsii, and Rickettsia conorii to the fluoroquinolone sparfloxacin [PDF]

Antimicrobial Agents and Chemotherapy, 1991
In vitro susceptibilities of Rickettsia rickettsii, Rickettsia conorii, and Coxiella burnetii to the new fluoroquinolone sparfloxacin (AT-4140; RP 64206) were determined. Plaque and dye uptake assays were used to measure the MICs against R. rickettsii and R. conorii. The susceptibilities of C.
D, Raoult, P, Bres, M, Drancourt, G, Vestris   +3 more
openaire   +2 more sources

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

Clonal T Cell Proliferation Induced by Acute Anaplasmosis in a Dog

Journal of Veterinary Internal Medicine, Volume 39, Issue 5, September/October 2025.
ABSTRACT A 4‐year‐old spayed female Golden Retriever was examined for hindlimb lameness, lethargy, poor appetite, and pyrexia 3 weeks after the removal of numerous ticks. Complete blood count revealed moderate thrombocytopenia and mild lymphopenia. A SNAP 4Dx test was negative for Borrelia burgdorferi, Ehrlichia spp., Anaplasma spp., and Dirofilaria ...
Sean R. Teichner, Lisa L. Powell, Allison S. Mazepa   +2 more
wiley   +1 more source

Human endothelial cell culture plaques induced by Rickettsia rickettsii.

, 1982
Primary cultures of human umbilical vein endothelial cells were inoculated with plaque-purified Rickettsia rickettsii. After adsorption of rickettsiae, monolayers were overlaid with medium containing 0.5% agarose.
Edgell, Cora-Jean S., Walker, David H., Firth, William T.   +2 more
core   +1 more source