Results 41 to 50 of about 3,644 (172)

Identification of Lupus Erythematosus Cells and Ragocytes in Peripheral Blood from a Dog with Systemic Lupus Erythematosus

Veterinary Clinical Pathology, EarlyView.
ABSTRACT A 3‐year‐old female‐intact German Shepherd presented for the evaluation of progressive shifting leg lameness, carpal swelling, and weight loss with a poor appetite since adoption about three months prior. Routine blood smear evaluation, lymph node, and synovial fluid cytologies all revealed rare neutrophils with cytoplasmic inclusions ...
Samantha L. Braman, Jeremy P. Bessett, Katie L. Anderson, Kristen R. Friedrichs   +3 more
wiley   +1 more source

Fatal Human Infection with Rickettsia rickettsii, Yucatán, Mexico

Emerging Infectious Diseases, 2006
The first fatal Rickettsia rickettsii infection was diagnosed in the southwest of Mexico. The patient had fever, erythematous rash, abdominal pain, and severe central nervous system involvement with convulsive crisis. The diagnosis of R.
Jorge E. Zavala-Castro, Jorge E. Zavala-Velázquez, David H. Walker, Edgar E. Ruiz Arcila, Hugo Laviada-Molina, Juan P. Olano, José A. Ruiz-Sosa, Melissa A. Small, Karla R. Dzul-Rosado   +8 more
doaj   +1 more source

Vectors and Vector‐Borne Diseases: Biology, Epidemiology and Integrated Control Strategies

Journal of Applied Entomology, Volume 150, Issue 7, Page 990-1015, August 2026.
ABSTRACT Vector‐Borne Diseases (VBDs), transmitted by arthropods such as mosquitoes, ticks, fleas and sandflies, represent a significant threat to global health. These diseases can be caused by a variety of pathogens, including bacteria, viruses, protozoa, and helminths.
Roberta Rinaldi, Carmen Scieuzo, Federica De Stefano, Luca Masucci, Patrizia Falabella   +4 more
wiley   +1 more source

Transformation Frequency of a mariner-Based Transposon in Rickettsia rickettsii [PDF]

Journal of Bacteriology, 2011
ABSTRACTTransformation frequencies of amariner-based transposon system inRickettsia rickettsiiwere determined using a plaque assay system for enumeration and isolation of mutants. Sequence analysis of insertion sites in bothR. rickettsiiandR. prowazekiiindicated that insertions were random.
Tina R, Clark, Amanda M, Lackey, Betsy, Kleba, Lonnie O, Driskell, Erika I, Lutter, Craig, Martens, David O, Wood, Ted, Hackstadt   +7 more
openaire   +2 more sources

Rickettsiales in South America: A Systematic Review of Their Molecular Detection and Distribution in Arthropods and Vertebrates

Public Health Challenges, Volume 5, Issue 2, June 2026.
ABSTRACT Bacteria of the order Rickettsiales comprise a diverse group of obligate intracellular microorganisms that are globally distributed and highly prevalent in tropical and subtropical regions. In South America, these bacteria have been associated with arthropod vectors, such as ticks, fleas, mites, lice, and certain dipterans, as well as with a ...
Cristian J. Zamorano‐Gómez, Paula A. Ossa‐López, Estefani T. Martínez‐Sánchez, Fredy A. Rivera‐Paéz   +3 more
wiley   +1 more source

Rickettsial neuroretinitis: A report of 2 cases

American Journal of Ophthalmology Case Reports, 2021
Purpose: The authors present two cases of neuroretinitis caused by Rickettsia rickettsii infection. Observations: Case 1 is a 24-year-old male who presented with 2 months of vision loss.
Caroline C. Awh, Akshay S. Thomas
doaj   +1 more source

Amblyomma cajennense Sensu Stricto (Fabricius, 1787) and Amblyomma sculptum (Berlese, 1888) Tick Saliva Elicit Immune‐Modulatory Activity in Isolated Murine Macrophages With an Insight Into Proteomic Analysis

Parasite Immunology, Volume 48, Issue 3, March 2026.
ABSTRACT Tick saliva is known to cause immunosuppression and help pathogen transmission. Amblyomma sculptum is a public health concern as a vector of Rickettsia rickettsii. Another close‐related species is Amblyomma cajennense sensu stricto (s.s.). The impact of saliva from these species on murine macrophages remains unclear.
André de Abreu Rangel Aguirre, Valdison Pereira dos Reis, Sulamita da Silva Setúbal, Angélica Lorena Pereira Mendes Carioca, Ketlei Monteiro Tavares, Geisa Paulino Caprini Evaristo, Joseph Albert Medeiros Evaristo, Fábio César Sousa Nogueira, Jansen Fernandes Medeiros, Juliana Pavan Zuliani   +9 more
wiley   +1 more source

Insights on the phenology of the Asian longhorned tick (Haemaphysalis longicornis) using stored lipids

Insect Science, Volume 33, Issue 1, Page 396-406, February 2026.
Lipid analysis of field‐collected ticks unveiled a complex population structure and supports the potential for several stages to overwinter. Abstract The seasonality of Haemaphysalis longicornis in the United States comprises overlapping life stages in the spring and summer.
Matthew Bickerton, Julia González, Alvaro Toledo   +2 more
wiley   +1 more source

Seroprevalence of Rickettsia rickettsii and Rickettsia parkeri in dogs during a Brazilian Spotted Fever outbreak in the State of Rio de Janeiro

Arquivo Brasileiro de Medicina Veterinária e Zootecnia
The present paper is the first to perform this evaluation in dogs from the cities of Natividade, Porciuncula and Varre-Sai. The aim of this study is to search for Spotted Fever Group Rickettsia in canine sera using indirect immunofluorescence assay and ...
I.T. Poubel, N.C. Cunha, A.B.M. Fonseca, A. Pinter, A.H. Fonseca, M.D. Cordeiro, N.R.P. Almosny   +6 more
doaj   +1 more source

Detection of Rickettsia spp. in Rhipicephalus sanguineus (sensu lato) collected from free-roaming dogs in Coahuila state, northern Mexico

Parasites & Vectors, 2019
Background The aim of this study was to detect and molecularly identify Rickettsia spp. in Rhipicephalus sanguineus (sensu lato) collected from free-roaming dogs in 30 communities from five municipalities in the south of Coahuila State, northern Mexico ...
Aldo I. Ortega-Morales, Erika Nava-Reyna, Verónica Ávila-Rodríguez, Vicente H. González-Álvarez, Antonio Castillo-Martínez, Quetzaly K. Siller-Rodríguez, Alejandro Cabezas-Cruz, Filipe Dantas-Torres, Consuelo Almazán   +8 more
doaj   +1 more source