Arthropods
| Auteur: | Microbiology and Immunology on-line University of South Carolina |
| Tags: | Video's Leerboek Lessen/cursussen Foto's/dia's Parasieten Hoger onderwijs Middelbaar onderwijs Engels Medisch/Veterinair |
| Bron: | http://pathmicro.med.sc.edu/parasitology/arthropods.htm 
Melding defecte link. |
Fleas, lice, chiggers, bot flies and ticks Numerous species of arthropods play a role in human disease. Most of these are as vectors of different pathogens and, in other sections of this text, we have dealt with such disease vectors. There are also a number of arthropods that cause harm due their venom but these are not parasites. Here, we shall deal with arthropods that are parasitic to and cause disease in man. For example, myiasis (burial of larvae in tissue) is an obligatory step in the life cycle of some flies and incidental for others. Species that cause myiasis in the Americas are Cochliomyia (Screw worm fly), Calliphora, Oestrus, Sarcophaga, Gastrophilus, etc. Myiasis may be cutaneous, arterial, intestinal or urinary in normal tissue or in pre-existing wounds, some of which may result from other infections. Larvae can burrow through necrotic or healthy tissue using their mandibular hooks aided by proteolytic enzymes. They can cause mechanical damage and the affected area may be the site of a secondary infection. Cutaneous myiasis may require surgical removal of burrowed larvae. Eggs and maggots may be washed from hair, skin and wounds with soap and water. Urinary myiasis usually clears itself. Purgation with anti-helminths may be necessary for gastrointestinal myiasis.
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