By John O’Donel Alexander MB, ChB, FRCP (Glasgow) (auth.)
To the entomologist all bugs have six legs; the layman has a tendency to take advantage of the time period "insect" to incorporate the eight-legged spiders and mites. some of these creatures are properly labeled as arthropods. Many hundreds of thousands of the masses of millions of acknowledged species of arthropods are present in the human environment-domestic, occupational and rec reational. these species that are obligate parasites of guy, the human scabies mite and the top and physique lice, produce regular medical syndromes. they continue to be vital in clinical perform and feature been the topic of loads of contemporary examine. this can be starting to throw a lot gentle at the immunological mechanisms which mostly be sure the reactions of the host. Dr. Alexander has supplied an in depth survey of this paintings. The wasps, bees, ants and different Hymenoptera that could sting guy in self-defence may cause painful, even deadly reactions. the new paintings in this vital topic has additionally been completely reviewed. each dermatologist of expertise will admit that he sees many sufferers in whom he makes a analysis of "insect bites", if he has the boldness to take action, or of "papular urticaria" or "prurigo" while he lacks such self belief, more often than not simply because he's at a loss to understand which arthropod could be implicated. In his survey of the large literature within the entomological, public well-being and dermatology journals Dr. Alexander has supplied a useful advisor within which the recommendations to those medical mysteries might be sought.
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Extra resources for Arthropods and Human Skin
These have been laid by lice on a scalp inadequately treated with anticholinesterases; the mobile forms are ultimately destroyed but the eggs remain; the embryos develop but are unable to escape because they too are paralysed. Conversely lice may sometimes be seen without eggs on scalps inadequately treated with these insecticides; the residual effect kills off these lice before they can lay any eggs (Maunder 1981). Secondary infection is almost always manifested as discrete or confluent lesions of impetigo contagiosa and may extend beyond the confines of the scalp.
9. Chronic scattered pigmentation of long-standing moderate pediculosis corporis. This appearance is not infrequently seen in patients unsuspected of being lousy who are admitted to hospital for some other reason. Pediculus humanus 37 areas, but only with heavy infestation (Fig. 12). Very occasionally they may be found in the perineal area only, with no other involvement. In such cases the only complaint is pruritus ani. Fig. 10. Heavy pigmentation, especially in the pubic area, in a man with severe long-standing pediculosis corporis.
Greenough indicated that if these lesions Pediculosis Corporis were not scratched they would disappear in 24 h. In the great majority of cases of pediculosis corpor- Lloyd reported that they disappeared within an ris there is only one symptom-itch. It is intermit- hour but often reappeared and then itched. When tent and is commonest at night, but not exclusively scratched a tiny red crust appears on the surface. so. It can be very severe and causes indiscriminate Rook (1979) stated that "investigations on volunscratching, which may be quite frantic at times teers show that in previously unexposed subjects (Fig.
Arthropods and Human Skin by John O’Donel Alexander MB, ChB, FRCP (Glasgow) (auth.)