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At least 919 records · Page 51Linked to original sources
PubMed1998

Tropical rat mite dermatitis: case report and review.

Six medical students inhabiting a centuries-old, rat-infested house in Lübeck, in northern Germany, were suffering from itching papules and seropapules. Prior to these patients' visit to our institute, their conditions had been diagnosed as pediculosis, scabies, or pulicosis and treated unsuccessfully with the antiparasitic agent lindane (0.3%). The final diagnosis, tropical rat mite dermatitis, was based on the identification of the arthropod Ornithonyssus bacoti, which has an unsegmented body with eight legs. No treatment was recommended, and the dermatitis disappeared within 2 weeks. Measures taken to prevent reinfestation included extermination of the rats and treatment of the rooms of the house with the acaricide benzyl benzoate. Because the mite O. bacoti spends a relatively short time on a host and penetrates the skin for feeding only, the application of an antiparasitic agent is not necessary. If indicated, treatment should be symptomatic.

Adult↗
PubMed2004

Update on spotted fever group Rickettsiae in South Africa.

Until very recently, Mediterranean spotted fever caused by Rickettsia conorii was the only spotted fever group (SFG) rickettsioses recognized in southern Africa. However, increasing medical awareness of tick-borne infections, together with the introduction of improved isolation methods and the availability of molecular techniques, have led to the identification of several new SFG rickettsioses in the region. African tick bite fever, caused by Rickettsia africae, is currently the most important of these new rickettsioses, affecting large numbers of international travellers each year, but infections due to Rickettsia aeschlimannii and Rickettsia mongolotimonae have also been recently encountered. In this review, we describe the current status of the epidemiology, microbiology, clinical presentation, diagnosis, treatment, and prevention of SFG rickettsioses in southern Africa.

Animals↗
PubMed1992

Clothing impregnations of dibutylphthalate and permethrin as protectants against a chigger mite, Eutrombicula hirsti (Acari: Trombiculidae).

A field study to compare the effects of wearing military uniforms treated with permethrin or dibutylphthalate as protection against the chigger Eutrombicula hirsti (Sambon) was conducted in northern Queensland, Australia, during November 1990. Volunteers who wore treated uniforms received significantly fewer chigger attachments than individuals who wore untreated uniforms. Australian military uniforms treated with dibutylphthalate provided a 97.6% increase in protection, whereas uniforms treated with 0.058-0.101 mg/cm2 permethrin provided 96.4% protection. U.S. Army uniforms treated with 0.125 mg/cm2 permethrin provided 83.2% protection. The differences between the clothing treatments were not significant. The results show that wearing clothing impregnated with either compound is an effective method for personal protection against E. hirsti.

Animals↗
PubMed1993

An unexpected result from burning vegetation to reduce Lyme disease transmission risks.

The risk for human infection with Lyme disease appears linked to the abundance of infected vector ticks, principally Ixodes dammini Spielman, Clifford, Piesman & Corwin, in the eastern United States. Habitat destruction by burning, although not well studied, has long been considered as an effective alternative to synthetic insecticides as a means of reducing tick populations. We evaluated the effect of a single spring burning of the woodland understory on the transmission risk of Lyme disease spirochetes (Borrelia burgdorferi Johnson, Schmid, Hyde, Steigerwalt & Brenner) on Shelter Island, Long Island, NY. Following a burn in early April 1991, the abundance of nymphal I. dammini was 49% lower in the burned portion of a woodlot compared with the unburned portion. However, risk of encountering nymphs infected with B. burgdorferi remained similar in both burned and unburned woods. It is suggested that burning vegetation may disproportionately kill deer-derived rather than rodent-derived nymphs, significantly reducing tick abundance without affecting transmission risk.

Animals↗
PubMed1995

Potential influence of leaf litter depth on effectiveness of granular carbaryl against subadult Ixodes scapularis (Acari: Ixodidae).

An application of carbaryl granules at the lowest recommended rate to the shrub layer of a forested residential community in late spring significantly reduced abundance of questing Ixodes scapularis Say nymphs throughout their peak activity period. Depth of leaf litter had no significant effect on the level of reduction, suggesting that granular carbaryl applied at relatively low rates can obviate the possible attenuating effects of leaf litter.

Animals↗
PubMed1997

Simulation of management strategies for the blacklegged tick (Acari: Ixodidae) and the Lyme disease spirochete, Borrelia burgdorferi.

A computer model (LYMESIM) was developed to simulate the effects of management technologies on populations of the blacklegged tick, Ixodes scapularis Say, and the Lyme disease spirochete Borrelia burgdorferi Johnson, Schmid, Hyde, Steigerwalt & Brenner in eastern North America. Technologies considered in this study were area-wide acaricide, acaricide self-treatment of white-footed mice and white-tailed deer, vegetation reduction, and white-tailed deer density reduction. Computer simulations were run with normal weather patterns for coastal Connecticut and New York. Results showed that area-wide acaricide, vegetation reduction, or a combination of these technologies would be useful for short-term seasonal management of ticks and disease in small recreational or residential sites. Acaricide self-treatment of deer appears to be the most cost-effective technology for use in long-term management programs in large areas. Simulation results also suggested that deer density reduction should be considered as a management strategy component. Integrated management strategies are presented that could be used in pilot tests and operational tick and tick-borne disease programs.

Animals↗