Parasitology Spring 2009 Order Spirurida Family Gnathostomatidae

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Parasitology Spring 2009 Order Spirurida Family Gnathostomatidae

BIO 475 - Parasitology Spring 2009 Stephen M. Shuster Northern Arizona University http://www4.nau.edu/isopod Lecture 21 Order Spirurida Characteristics: 1. Adults with pseudolabia, or with lips (or not!). 2. Esophagus with anterior muscular portion, posterior glandular portion; never a bulb. 3. J1-J3 in arthropod hosts; J4-adult in intestine or deep tissue. Family Gnathostomatidae a. Gnathostoma spp. 1. Carried by several hosts before infecting humans or other carnivores. 2. Forms cutaneous lumps, but can cause worse. 1 Gnathostoma spinigerum 2 Family Spirocercidae a. Spirocera lupi 1. Encysts in esophagus of dogs. 2. Can cause cancer. Superfamily Filaroidea Characteristics 1. Adults are tissue dwelling forms 2. Often vectored by biting insects a. J3s deposited on skin b. They crawl into wound and enter tissues. 3 Family Onchocercidae 1. Wuchereria bancrofti a. Vectored by several genera of mosquito. 1. Aedes, Anopheles, Culex, can support filariae 2. But do not always transmit it 4 5 Family Onchocercidae 2. Brugia malayi a. Similar to W. bancrofti b. Spread by mosquitos (Culex) c. primarily in South Pacific Family Onchocercidae 3. Onchocerca volvulus a. responsible for river blindness in Africa and SA b. Vectored by Simulium Onchocerca volvulus 6 Onchocerca volvulus a. Life Cycle 1. Host with adult worms in sheathes in skin 2. Microfilariae remain in skin where they are ingested by blackflies Onchocerca volvulus 3. Microfilariae migrate to thoracic muscles of fly 4. Develop into J1 and then J2 (sausage stage) 5. Become filariform J3s (infective) 6. J3s transferred in fly bite 7. Cutaneous adults appear in year. Onchocerca volvulus c. Microfilariae invade cornea and after death cause scarring; d. Wolbachia bacteria in worms seems to be responsible. 7 Onchocerca volvulus 1. Invasion of lymphatic system can also cause elephantiasis, particularly in genitalia and mammary glands. 8.

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Gnathostoma Spinigerum Was Positive
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