A new treatment of pthiriasis palpebrarum

Treatment of phthiriasis palebrarum so far is unsatisfactory and prolonged. It was an accidental finding that led us to try various strengths of fluorescein on head lice. It was seen from our study that 20% fluorescein resulted in the lice' instantaneous death. This percentage was used in all our subsequent cases of phthiriasis with excellent results. A new method for the treatment of phthiriasis palpebrarum from the eyelash by a single application of 20% fluorescein is described. This method required no sedation or anesthetic and can be carried out as an outpatient department procedure. It is nontoxic and not irritating. There is no risk of the physician being infested, as the lice and nits are killed instantaneously.

Control of psoroptic scabies on calves with ivermectin

Eleven Hereford or Angus-cross calves slightly to severely infested with common scabies mites (Psoroptes ovis) were treated with 22,23-dihydroavermectin B1a (ivermectin) at dosages given subcutaneously (SC)--300 micrograms/kg; orally--400 micrograms/kg; or IM--50, 100, or 200 micrograms/kg. At 14 days after treatment, live mites were not found on any of the calves treated SC or IM, but live mites were found on all of the orally treated calves at 14 days and on 1 of them at 28 days after treatment. Four nontreated calves retained their mite infestations during the course of the IM test. Biting lice (Bovicola bovis) were eliminated from 1 calf treated SC, but not from calves treated IM. Ear ticks (Otobius megnini) were not noticeably affected.

Lethal effects of synthetic juvenile hormone on the human body louse

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Second survey of insecticid-resistance in body-lice, 1958-63

Between 1953 and 1956 the World Health Organization carried out a global survey of the susceptibility of body-lice to insecticides. A second survey was organized in 1958; this paper summarizes the results of susceptibility tests done in 22 countries over the period 1958-63.Resistance to DDT has been found in a number of countries. The LC(100) for resistant body-lice has been found to be over 5% DDT, the LC(100) for hybrids to be between 1% and 5% DDT; and the LC(50) for susceptible genotypes has been estimated to be less than 0.04% DDT.Body-lice continue to be susceptible to gamma-HCH and pyrethrins in most countries, although they show increased tolerance to gamma-HCH in Egypt. Their susceptibility to malathion in various localities in Egypt has been assessed, and the LC(50) found to range from 0.02% to 0.032%.