Human Pest Part A

Human Pest Part A - Insects as Pests of Humans (Part A) Why...

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Insects as Pests of Humans (Part A) Why insects still ‘plague’ humans throughout the world V V Take Home Message Some insect pests transmit a number of extremely important diseases of humans, some of which are deadly and/or debilitating even today. A major reason this course is in the Global Issues part of the Core Curriculum Mosquito Life Cycle Mosquito eggs are most often laid on water, typically in a raft. Treeholes are a good breeding site for some mosquitoes H Order: Diptera Most important order for transmitting diseases
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Mosquito Life Cycle Egg Adult Larvae and pupae are aquatic, but they do not have gills. They use a breathing tube to get oxygen from the air. H Larva Pupa More Images Related to This Topic H Malaria From 'mal aria' meaning bad air. 50 different kinds of malaria, four kinds affect humans Plasmodium spp. is the protozoan parasite. It is a parasitic amoeba Malaria is transmitted by the female Anopheles spp. mosquito Very quiet mosquito, likes houses/huts does not fly very far From: The Malaria Capers V
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Malaria Life Cycle Two hosts required. In humans: Mosquito bites human, infests by injecting saliva containing protozoa Protozoa travel to liver of human, change form, and multiply 100X to 1000X Protozoa then go into human to blood and invade red blood cells (RBCs) Protozoa multiply within RBCs RBCs break, releasing protozoa reproductive cells and toxic wastes into bloodstream 1st symptom-chills, then fever as body attempts to neutralize toxins, then sweating V From: The Malaria Capers Liver Malaria Life Cycle In mosquitoes: Mosquito bites infected person, ingests RBCs with protozoa Protozoa change form, encyst in mosquito gut wall, multiply there Protozoa travel to salivary gland of mosquito, become concentrated, and wait for mosquito to bite someone Life cycle of protozoa repeats as described on previous slide From: The Malaria Capers V Gut Salivary gland Malaria Malaria kills more than 1 million per year out of 300 million cases worldwide Most common human disease in the world today 90% of deaths are in Africa, south of Sahara, and most deaths are children under 5. Cost to African countries = $12 billion. Malaria kills an African child every 30
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This note was uploaded on 08/15/2011 for the course ENT 2004 taught by Professor Jrvoshell during the Spring '07 term at Virginia Tech.

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Human Pest Part A - Insects as Pests of Humans (Part A) Why...

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