寄生虫医学课件：arthropod mosquito fly flea scab mite(m).ppt

myiasis 3)?Myiasis: the disease caused by the parasitism of fly larva, cutaneous myiasis, intestinal myiasis, urogenitel myiasis and eye myiasis. . The main methods of control are as follows: 1)? Source reduction by environmental modify 2)?Insecticide use. Control 3) Physical methods: in house, barns, milking parlors, screening to keep flies out is the first line of defense Common flies Fleas belong to Order Siphonaptera, are ecto-parasites of mammalian and birds. There are more than 2000 species in the world. among them, only a few species are vectors of zoonosis. FLEA The males measure 3 mm long, and females are shorter than the males. The body is brown-yellow color and covered with bristle. Morphology The life cycle of the flea. Fleas can cause harms to humans by irritation, parasitism and transmission of diseases. Fleas frequently bite person on the ankles and legs, but at night a sleeping person may be bitted on other parts of the body. Harm to humans The most serious disease-plague is transmitted by flea. The pathogen of plague is Yersinia pestis. Flea-born epidemic typhus is also important disease transmitted by fleas. The fleas are also intermediate host of Dipylidium caninum and Hymenplepi diminuta. The structures related to transmitting plague esophagus chewing stomach midgut plague Control The main methods of control are as follows: a) environmental modify b) insecticide use c) personal protection TROMBICULID MITE Trombiculid mite, which common name is chigger, red bug, or harvest mite, belongs to Family Trombiculidae. Among the common genera in this family is Leptotrombidium deliensis in China. Morphology Keys for identifying chiggers are based on the larvae. They are typically reddish or orange, tiny mites 0.2 to 0.5 mm long. the larva of Leptotrombidium deliensis The body consists of gnathosoma and idiosoma. The gnathosoma have a pair of pedipalpies and cheliceraes. The idiosoma have three pairs of le