Results 61 to 70 of about 4,003 (214)

External layers of Rickettsia prowazekii and Rickettsia rickettsii: occurrence of a slime layer [PDF]

Infection and Immunity, 1978
Using a simple specific-antibody stabilization procedure on organisms gently liberated from their host cells, we have demonstrated by electron microscopy that Rickettsia prowazekii and Rickettsia rickettsii possess a coat of variable thickness, external to the outer leaflet of the cell wall and the structure designated by others as a "microcapsule ...
D J, Silverman, C L, Wisseman, A D, Waddell, M, Jones   +3 more
openaire   +2 more sources

Rocky Mountain Spotted Fever, Panama

Emerging Infectious Diseases, 2007
We describe a fatal pediatric case of Rocky Mountain spotted fever in Panama, the first, to our knowledge, since the 1950s. Diagnosis was established by immunohistochemistry, PCR, and isolation of Rickettsia rickettsii from postmortem tissues.
Dora Estripeaut, María Gabriela Aramburú, Xavier Sáez-Llorens, Herbert A. Thompson, Gregory A. Dasch, Christopher D. Paddock, Sherif Zaki, Marina E. Eremeeva   +7 more
doaj   +1 more source

Spatial and temporal analyses of Dermacentor variabilis (Say) (Acari: Ixodidae) in central and eastern Canada

Medical and Veterinary Entomology, Volume 39, Issue 3, Page 515-524, September 2025.
One thousand one hundred ninety‐eight adult Dermacentor variabilis (Say), a species of veterinary and human medical importance, were collected from companion animals in central and eastern Canada. Peaks in adult D. variabilis submissions occurred in May and June across the provinces. Most submissions of adult D.
Grace K. Nichol, J. Scott Weese, Shaun J. Dergousoff, Amy L. Greer, Katie M. Clow   +4 more
wiley   +1 more source

In vitro susceptibilities of Rickettsia rickettsii and Rickettsia conorii to roxithromycin and pristinamycin [PDF]

Antimicrobial Agents and Chemotherapy, 1989
In vitro susceptibilities of Rickettsia rickettsii and Rickettsia conorii to roxithromycin, pristinamycin, and the pristinamycin compounds, P1 and P2, were determined by a dye uptake assay and a plaque assay. The MICs were 1 microgram/ml for roxithromycin, 2 micrograms/ml for pristinamycin, greater than 256 micrograms/ml for P1, and 2 micrograms/ml for
M, Drancourt, D, Raoult
openaire   +2 more sources

A new spotted fever group Rickettsia genotype in Haemaphysalis leporispalustris from Maine, USA

Ticks and Tick-Borne Diseases
Spotted fever group (SFG) rickettsioses are increasingly recognized worldwide as threats to public health. Rickettsia rickettsii, Rickettsia parkeri, and Rickettsia rickettsii subspecies californica cause spotted fever rickettsioses, including Rocky ...
Guang Xu, Elissa Ballman, Nolan Stamborski, Eric L. Siegel, Patrick Pearson, Stephen M. Rich   +5 more
doaj   +1 more source

Rickettsia spp. and Anaplasmataceae in Ticks From Domestic Animals in Northern Colombia

Zoonoses and Public Health, Volume 72, Issue 5, Page 421-434, August 2025.
ABSTRACT Introduction Tick‐borne diseases have a significant impact on public and animal health and represent a considerable financial burden on livestock farming. However, in many regions of Latin America, comprehensive epidemiological data, including species identification, geographical distribution and molecular profiling of ticks and their ...
Maria Badillo‐Viloria, Salim Mattar, Susana Remesar, Steffania de la Rosa‐Jaramillo, Ignacio García‐Bocanegra, Jorge Miranda, Aránzazu Portillo, Cristina Cervera‐Acedo, José Antonio Oteo, David Cano‐Terriza   +9 more
wiley   +1 more source

Investigation of Anti‐IgG Antibody Responses to the 17‐kDa Outer Membrane Protein of Rickettsia japonica in Individuals From a High‐Risk Area for Japanese Spotted Fever

Experimental Dermatology, Volume 34, Issue 7, July 2025.
ABSTRACT This study evaluated the seroprevalence and persistence of IgG antibodies against Rickettsia japonica's outer membrane protein (Omp) using a recombinant 17‐kDa antigen and Western blot analysis in residents of Minamiise, Japan—a high‐incidence Japanese spotted fever (JSF) area—and in individuals from non‐endemic regions.
Makoto Kondo, Koji Habe, Keiichi Yamanaka   +2 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

Genome sequence of the endosymbiont Rickettsia peacockii and comparison with virulent Rickettsia rickettsii: identification of virulence factors. [PDF]

PLoS ONE, 2009
Rickettsia peacockii, also known as the East Side Agent, is a non-pathogenic obligate intracellular bacterium found as an endosymbiont in Dermacentor andersoni ticks in the western USA and Canada.
Roderick F Felsheim, Timothy J Kurtti, Ulrike G Munderloh   +2 more
doaj   +1 more source

The Immunology of Alpha‐Gal Syndrome: History, Tick Bites, IgE, and Delayed Anaphylaxis to Mammalian Meat

Immunological Reviews, Volume 332, Issue 1, July 2025.
ABSTRACT The primary features of the alpha‐gal syndrome (AGS) are (i) The IgE ab that are causally related to anaphylaxis with infusions of Cetuximab are specific for galactose alpha‐1,3‐galactose. (ii) In the USA, this IgE ab is induced by bites of the tick Amblyomma americanum. (iii) The anaphylactic reactions to food derived from non‐primate mammals
Thomas A. E. Platts‐Mills, Roopesh Singh Gangwar, Lisa Workman, Jeffrey M. Wilson   +3 more
wiley   +1 more source