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Rocky Mountain spotted fever

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https://www.readbyqxmd.com/read/27929218/emerging-vector-borne-diseases
#1
Mark K Huntington, Jay Allison, Dilip Nair
Several mosquito-borne viral infections have recently emerged in North America; West Nile virus is the most common in the United States. Although West Nile virus generally causes a self-limited, flulike febrile illness, a serious neuroinvasive form may occur. Dengue is the most common vector-borne viral disease worldwide, and it has been a significant public health threat in the United States since 2009. Known as breakbone fever for its severe myalgias and arthralgias, dengue may cause a hemorrhagic syndrome...
October 1, 2016: American Family Physician
https://www.readbyqxmd.com/read/27880753/notes-from-the-field-community-based-prevention-of-rocky-mountain-spotted-fever-sonora-mexico-2016
#2
Anne Straily, Naomi Drexler, Denica Cruz-Loustaunau, Christopher D Paddock, Gerardo Alvarez-Hernandez
Rocky Mountain spotted fever (RMSF), a life-threatening tickborne zoonosis caused by Rickettsia rickettsii, is a reemerging disease in Mexico (1,2). R. rickettsii is an intracellular bacterium that infects vascular endothelium and can cause multisystem organ failure and death in the absence of timely administration of a tetracycline-class antibiotic, typically doxycycline. Epidemic RMSF, as described in parts of Arizona and Mexico, is associated with massive local infestations of the brown dog tick (Rhiphicephalus sanguineus sensu lato) on domestic dogs and in peridomestic settings that result in high rates of human exposure; for example, during 2003-2012, in Arizona the incidence of RMSF in the three most highly affected communities was 150 times the U...
November 25, 2016: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/27861477/-complications-and-cause-of-death-in-mexican-children-with-rocky-mountain-spotted-fever
#3
Miguel Ángel Martínez-Medina, Adela Rascón-Alcantar
BACKGROUND: Rocky Mountain spotted fever is a life threatening disease caused by Rickettsia rickettsia, characterized by multisystem involvement. METHODS: We studied 19 dead children with Rocky Mountain spotted fever. All children who were suspected of having rickettsial infections were defined as having Rocky Mountain spotted fever by serology test and clinical features. Through the analysis of each case, we identified the clinical profile and complications associated to the death of a patient...
November 2016: Gaceta Médica de México
https://www.readbyqxmd.com/read/27815656/efficacy-of-tagetes-minuta-asteraceae-essential-oil-against-rhipicephalus-sanguineus-acari-ixodidae-on-infested-dogs-and-in-vitro
#4
Elis Maressa Gonçalves da Silva, Vinicius da Silva Rodrigues, Jaciara de Oliveira Jorge, Carolina Fonseca Osava, Matias Pablo Juan Szabó, Marcos Valério Garcia, Renato Andreotti
Ticks from Rhipicephalus sanguineus complex are widely distributed in the world and one species from this complex is the most common tick on dogs in Brazil, notably in urban areas. This tick is a vector of several diseases. Among others it transmits the agent of canine Ehrlichiosis, a major dog infectious disease and the agent of Rocky Mountain spotted fever. This tick can spread rapidly and develop intolerable infestations within no time. Currently tick control is done with acaricides and demand for such drugs has grown fast...
November 4, 2016: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/27808070/geographic-eponyms-a-history-of-geography-in-medicine
#5
Maharra Hussain, Sanjay A Pai
Geographic eponyms have commonly been used in medical terminology, with diseases and medical entities being named after the place where the condition was discovered (e.g. Bombay Blood group) or invented (Jaipur Foot) or where the disease was first detected (Rocky Mountain Spotted fever) or where a consensus meeting has been held (Banff) or for other reasons (Argentina flag, Congo red stain). In 2015, the WHO decided to adopt a politically correct method to name infectious diseases in the future. We illustrate, in verse form, some of the places that have been used in medical terminology, over the centuries...
May 2016: National Medical Journal of India
https://www.readbyqxmd.com/read/27734445/rocky-mountain-spotted-fever
#6
Mark W Burnett
No abstract text is available yet for this article.
2016: Journal of Special Operations Medicine: a Peer Reviewed Journal for SOF Medical Professionals
https://www.readbyqxmd.com/read/27696381/climate-change-and-the-epidemiology-of-selected-tick-borne-and-mosquito-borne-diseases-update-from-the-international-society-of-dermatology-climate-change-task-force
#7
Louise K Andersen, Mark D P Davis
Climate change refers to variation in the climate of a specific region or globally over time. A change has been reported in the epidemiology of tick- and mosquito-borne diseases in recent decades. Investigators have postulated that this effect may be associated with climate change. We reviewed the English-language literature describing changes in the epidemiology of specific tick- and mosquito-borne diseases, including the tick-borne diseases of Lyme disease, tularemia, Crimean-Congo hemorrhagic fever, Mediterranean spotted fever, and Rocky Mountain spotted fever and the mosquito-borne diseases of dengue, malaria, West Nile virus infection, Ross River virus disease, and Barmah Forest virus disease...
October 1, 2016: International Journal of Dermatology
https://www.readbyqxmd.com/read/27677425/vectorial-competence-of-amblyomma-tonelliae-to-transmit-rickettsia-rickettsii
#8
E L Tarragona, J F Soares, F B Costa, M B Labruna, S Nava
The aim of this work was to test the vectorial competence of Amblyomma tonelliae (Ixodida: Ixodidae) to transmit Rickettsia rickettsii (Rickettsiales: Rickettsiaceae), the agent of Rocky Mountain spotted fever (RMSF). All parasitic stages of A. tonelliae were exposed to R. rickettsii by allowing each stage to feed on hosts inoculated with this pathogen. Thereafter, ticks were fed on uninfected hosts. All stages of A. tonelliae were able to acquire the R. rickettsii infection and maintain it by transstadial and transovarial transmission...
September 28, 2016: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/27616774/first-report-of-candidatus-rickettsia-amblyommii-in-west-coast-of-mexico
#9
Sokani Sánchez-Montes, César A Ríos-Muñoz, Deborah V Espinosa-Martínez, Carmen Guzmán-Cornejo, Miriam Berzunza-Cruz, Ingeborg Becker
We report the first case of "Candidatus Rickettsia amblyommii" detected in Amblyomma mixtum ticks on humans on the west coast of Mexico. This is the most western record of "Ca. R. amblyommii" in the Western Hemisphere, representing the first record for the western coast of the Americas. Even if the record is far from the previously known locations for the species it does not represent a new record regarding temperature, precipitation and topographic parameters. Since "Ca. R. amblyommii" antibodies have been detected in patients suspected of Rocky Mountain spotted fever, and the tick A...
October 2016: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/27598937/-rocky-mountain-spotted-fever-in-mexican-children-clinical-and-mortality-factors
#10
Gerardo Álvarez-Hernández, María Del Carmen Candia-Plata, Jesús Delgado-de la Mora, Natalia Haydeé Acuña-Meléndrez, Anabel Patricia Vargas-Ortega, Jesús David Licona-Enríquez
OBJECTIVE: Characterize clinical manifestations and predictors of mortality in children hospitalized for spotted fever. MATERIALS AND METHODS: Cross-sectional study in 210 subjects with a diagnosis of Rocky Mountain spotted fever (RMSF) in a pediatric hospital in Sonora, from January 1st, 2004 to June 30th, 2015. Data were analyzed using descriptive statistics and multivariate logistic regression. RESULTS: An upward trend was observed in RMSF morbidity and mortality...
June 2016: Salud Pública de México
https://www.readbyqxmd.com/read/27585218/the-eye-and-tick-borne-disease-in-the-united-states
#11
Saraniya Sathiamoorthi, Wendy M Smith
PURPOSE OF REVIEW: Tick-borne diseases are increasing in incidence and geographic distribution. Several diseases endemic to the United States have ophthalmic manifestations, including the most common tick-borne disease, Lyme borreliosis. As ocular complaints may lead a patient to seek medical evaluation, it is important to be aware of the systemic and ophthalmic manifestations of tick-borne diseases in order to make the correct diagnosis. RECENT FINDINGS: Vision-threatening ophthalmic manifestations are relatively common in Lyme disease and Rocky Mountain spotted fever...
November 2016: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/27546608/cold-hardiness-and-influences-of-hibernaculum-conditions-on-overwintering-survival-of-american-dog-tick-larvae
#12
Andrew J Rosendale, David W Farrow, Megan E Dunlevy, Alicia M Fieler, Joshua B Benoit
Understanding how ticks survive the multitude of stresses experienced during winter is integral to predicting population dynamics and transmission of tick-borne pathogens. The American dog tick (Dermacentor variabilis), a predominant vector of Rocky Mountain spotted fever, overwinters in any of its post-egg life stages. In this study, we characterized the cold tolerance of larval D. variabilis and examined the effect of various acclimatory conditions on cold hardiness. Cold-shock survival during 2h exposure to various subzero temperatures was assessed and a lower lethal temperature of -20°C and a 50% mortality temperature near -16°C was established...
October 2016: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/27525249/differences-in-intracellular-fate-of-two-spotted-fever-group-rickettsia-in-macrophage-like-cells
#13
Pedro Curto, Isaura Simões, Sean P Riley, Juan J Martinez
Spotted fever group (SFG) rickettsiae are recognized as important agents of human tick-borne diseases worldwide, such as Mediterranean spotted fever (Rickettsia conorii) and Rocky Mountain spotted fever (Rickettsia rickettsii). Recent studies in several animal models have provided evidence of non-endothelial parasitism by pathogenic SFG Rickettsia species, suggesting that the interaction of rickettsiae with cells other than the endothelium may play an important role in pathogenesis of rickettsial diseases. These studies raise the hypothesis that the role of macrophages in rickettsial pathogenesis may have been underappreciated...
2016: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/27388434/notes-from-the-field-outbreak-of-hand-foot-and-mouth-disease-caused-by-coxsackievirus-a6-among-basic-military-trainees-texas-2015
#14
Jonathan Banta, Brittany Lenz, Mary Pawlak, Kelly Laskoski, Caitlin Seykora, Bryant Webber, Heather Yun, Simon Ritchie
On July 7, 2015, a man aged 22 years reported to sick call during basic military training at Lackland Air Force Base (AFB), Texas. He had erythematous, crusted papulovesicular lesions on the extensor surfaces of the upper and lower extremities. The patient was afebrile and otherwise well, and was evaluated later that day by the dermatology service. A viral infection was considered most likely because of the patient's age, absence of fever or constitutional symptoms, and the distribution and morphology of the lesions...
2016: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/27263175/a-clinical-review-of-tick-borne-diseases-in-arkansas
#15
REVIEW
Maria Theresa Montales, Alexandria Beebe, Arun Chaudhury, Dirk Haselow, Sowmya Patil, Sue Weinstein, Richard Taffner, Naveen Patil
Tick-borne diseases are illnesses transmitted by ticks harboring wide variety of pathogens. Arkansas is reported as one of the states with a high incidence of tick-borne diseases. In Arkansas the four most frequently occurring tick-borne diseases are Rocky Mountain Spotted Fever (RMSF, also known as Spotted Fever Rickettsiosis), Ehrlichiosis, Tularemia and Anaplasmosis. Lyme disease, on the other hand, is not acquired in Arkansas and is only acquired by traveling to states where Lyme disease is endemic. The majority of tick-borne diseases are diagnosed based on a history of tick bite or exposure and the individual's clinical presentation...
May 2016: Journal of the Arkansas Medical Society
https://www.readbyqxmd.com/read/27203693/molecular-ecological-insights-into-neotropical-bird-tick-interactions
#16
Matthew J Miller, Helen J Esser, Jose R Loaiza, Edward Allen Herre, Celestino Aguilar, Diomedes Quintero, Eric Alvarez, Eldredge Bermingham
In the tropics, ticks parasitize many classes of vertebrate hosts. However, because many tropical tick species are only identifiable in the adult stage, and these adults usually parasitize mammals, most attention on the ecology of tick-host interactions has focused on mammalian hosts. In contrast, immature Neotropical ticks are often found on wild birds, yet difficulties in identifying immatures hinder studies of birds' role in tropical tick ecology and tick-borne disease transmission. In Panama, we found immature ticks on 227 out of 3,498 individually-sampled birds representing 93 host species (24% of the bird species sampled, and 13% of the Panamanian land bird fauna)...
2016: PloS One
https://www.readbyqxmd.com/read/27172113/diagnosis-and-management-of-tickborne-rickettsial-diseases-rocky-mountain-spotted-fever-and-other-spotted-fever-group-rickettsioses-ehrlichioses-and-anaplasmosis-united-states
#17
Holly M Biggs, Casey Barton Behravesh, Kristy K Bradley, F Scott Dahlgren, Naomi A Drexler, J Stephen Dumler, Scott M Folk, Cecilia Y Kato, R Ryan Lash, Michael L Levin, Robert F Massung, Robert B Nadelman, William L Nicholson, Christopher D Paddock, Bobbi S Pritt, Marc S Traeger
Tickborne rickettsial diseases continue to cause severe illness and death in otherwise healthy adults and children, despite the availability of low-cost, effective antibacterial therapy. Recognition early in the clinical course is critical because this is the period when antibacterial therapy is most effective. Early signs and symptoms of these illnesses are nonspecific or mimic other illnesses, which can make diagnosis challenging. Previously undescribed tickborne rickettsial diseases continue to be recognized, and since 2004, three additional agents have been described as causes of human disease in the United States: Rickettsia parkeri, Ehrlichia muris-like agent, and Rickettsia species 364D...
2016: MMWR. Recommendations and Reports: Morbidity and Mortality Weekly Report. Recommendations and Reports
https://www.readbyqxmd.com/read/27022147/human-infections-by-multiple-spotted-fever-group-rickettsiae-in-tennessee
#18
Josie Delisle, Nicole L Mendell, Annica Stull-Lane, Karen C Bloch, Donald H Bouyer, Abelardo C Moncayo
Rocky Mountain spotted fever is the most common tick-borne disease in Tennessee. However, Rickettsia rickettsii has rarely been isolated from endemic ticks, suggesting rickettsioses may be caused by other species. A total of 56 human serum samples that were serologically positive for exposure to Rickettsia were obtained from commercial laboratories in 2010 and 2011. In addition, 20 paired sera from patients with encephalitis and positive Rickettsia serology were obtained from the Tennessee Unexplained Encephalitis Surveillance (TUES) study...
June 1, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/26963018/tick-borne-illnesses
#19
Edwin Choi, Natasha J Pyzocha, Douglas M Maurer
Tick-borne diseases are prevalent throughout the United States. These illnesses are caused by a variety of different pathogens that use ticks as vectors, including bacteria, viruses, rickettsia, and protozoa. Some of the most common illnesses caused by ticks are Lyme disease, Rocky Mountain spotted fever, babesiosis, ehrlichiosis, anaplasmosis, tularemia, Colorado tick fever, tick-borne relapsing fever, and Powassan disease. Unique skin changes, fever, and influenza-like symptoms may indicate tick-borne disease...
March 2016: Current Sports Medicine Reports
https://www.readbyqxmd.com/read/26942604/hierarchical-bayesian-spatio-temporal-analysis-of-climatic-and-socio-economic-determinants-of-rocky-mountain-spotted-fever
#20
Ram K Raghavan, Douglas G Goodin, Daniel Neises, Gary A Anderson, Roman R Ganta
This study aims to examine the spatio-temporal dynamics of Rocky Mountain spotted fever (RMSF) prevalence in four contiguous states of Midwestern United States, and to determine the impact of environmental and socio-economic factors associated with this disease. Bayesian hierarchical models were used to quantify space and time only trends and spatio-temporal interaction effect in the case reports submitted to the state health departments in the region. Various socio-economic, environmental and climatic covariates screened a priori in a bivariate procedure were added to a main-effects Bayesian model in progressive steps to evaluate important drivers of RMSF space-time patterns in the region...
2016: PloS One
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