Human lice infestations and their treatment.
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Eighteen red duikers, Cephalophus natalensis, from the Charters Creek Nature Reserve and 2 from Fanies Island Nature Reserve were processed for arthropod parasite recovery. They harboured 8 species of ixodid ticks and 2 lice species. All were infested with Haemaphysalis parmata and the nymphs of Rhipicephalus muehlensi. Two bushpigs, Potamochoerus porcus, from the Ndumu Nature Reserve, 5 from the Eastern Shores Nature Reserve and 1 from Cape Vidal were examined for ectoparasites. They were infested with 8 ixodid tick species, of which Rhipicephalus maculatus was the most abundant, and with 1 louse species.
Four studies were conducted to determine the efficacy of a 1% lambdacyhalothrin pour-on (Saber Pour-on, Schering-Plough Animal Health) for control of sucking lice (Linognathus vituli, Haematopinus eurysternus, Solenopotes capillatus) and biting lice (Damalinia bovis) on beef cattle. Seventy-four mixed-breed cattle naturally infested with one or more species of lice at locations in Wisconsin, Nebraska, Oklahoma, and North Dakota were included in the study. Pretreatment lice samples were taken and identified by genus with the exception that sucking lice were not identified by genus at the North Dakota site. In January or February, half of the cattle at each location received a single application of 1% lambdacyhalothrin pour-on at 10 ml per head for cattle weighing less than 273 kg (600 lb) or 15 ml per head for cattle weighing 273 kg or more. The other cattle at each site served as untreated controls. Lice on designated body areas were counted 2, 4, 6, and 8 weeks after treatment, and the sum of all lice observed on each counting area was reported for each animal. The collective efficacy 6 weeks after treatment against three species of sucking lice (L. vituli, H. eurysternus, S. capillatus) was 88.4% at the Wisconsin site, 92.0% at the North Dakota site, and 100% at the Nebraska and Oklahoma sites. The 1% lambdacyhalothrin pour-on eliminated all biting lice within 2 weeks after treatment, and no biting lice were detected 8 weeks after treatment. A single treatment of 1% lambdacyhalothrin pour-on administered when lice populations were highest (January or February) provided effective season-long control of both biting and sucking lice on cattle.
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670 children of infant-schools and 109 children of schools were examined for head-lice. Also the existence of nits was valued. The identified infestation of 9.9% is to stimulate examinations in other districts of GDR and measures to form the search and the control of these ectoparasites with more effects.
The American Academy of Pediatrics (AAP) established diagnosis and treatment guidelines for pediculosis in 2002. Ideally, diagnosis should be based on the observation of a live louse. The presence of nits is also used by many people to positively diagnose an infestation, although a nit located farther from the scalp than 1 cm is unlikely to be viable. Other material on the scalp may be mistaken for nits, leading to misdiagnosis. Because lice are not associated with serious medical problems, the primary consideration of the AAP regarding treatment is the safety of pediculicides and other products used to treat head lice. From a pediatrician's perspective, no significant risk is acceptable. Over-the-counter (OTC) pyrethroid products (pyrethrin and permethrin) are commonly used by parents to treat their children and are generally considered safe for most people. Pyrethroids are not completely ovicidal, however, so a second application is required. Misuse and overuse of these products have contributed to the development of resistance. Prescription products include permethrin 5%, lindane, and malathion 0.5%. Resistance to permethrin 5% and lindane has been documented. In addition, lindane is associated with serious adverse events and should be used with caution only in a select population. Malathion 0.5% is about 98% ovicidal, and no resistance has been reported. Malathion is highly effective, but AAP guidelines note that the product is flammable and serious adverse effects can occur with ingestion. Very few cases of ingestion have occurred, and no reported cases of flammability, but children being treated with malathion should be carefully supervised, and this pediculicide should not be used unless treatment with OTC products has failed. AAP guidelines also state that no-nit policies in schools are detrimental, causing lost time in the classroom, inappropriate allocation of the school nurse's time for lice screening, and a response to infestations that is out of proportion to their medical significance. Accurate diagnosis, safe treatment options, and a common-sense approach to managing infestations in schools are recommended.
A comparison of external parasitic infestations among inhabitants of Legnica, Wałbrzych, and Wrocław districts, in the Lower Silesia region of Poland showed a direct relationship between the high incidence of scabies and low standard ecological indices, as well as social economic setting of the communities. In the years 1990-1997, the highest mean incidences of scabies per 100,000 people (80 and 46) were noted, respectively, in the Legnica and Wałbrzych districts, compared to only 7.9 in the Wrocław district. Infestation was correlated with percentages of the population with higher education (4.8; 4.2, 10.1, respectively) and the number of patients per physician (795, 632, 288, respectively), and the percentages of degraded land/and land threatened by degradation (10/37, 5/16, 0.7/10, respectively), forest stands damaged by gases and particulates (99.4, 99.4, 58.8, respectively), and air pollution emission indices in the towns of Legnica and Wałbrzych (30 and 21 tons/km2) and Wrocław (16). Scabies infestation was highest in children and teenagers (0-19) and was gender-associated (in all age groups, women were more often infested than men). A decreasing rate of scabies infestation, especially from the mid-1990s, was noted for both scabies and pediculosis in Wałbrzych district; in the 0-19-yr-old inhabitants, it varied from 0.75% in 1994 to 0.41% in 1996.