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Unformatted text preview: Insects as Pests of Humans (Part D) Why we sometimes feel lousy V Leishmaniasis • Vector: a sandfly, Phebotomus argentipes • Eggs and larvae any place with organic matter, heat, humidity. Not aquatic like many True Flies (Diptera) • Pathogen: Leishmania spp , which are microscopic flagellated protozoans • Mode of attack: the microorganism attacks the phagocytes, which are the 'hunter-killer' cells in the immune system. • Phagocytes that have been invaded by protozoa are not recognized as being parasitized. • Weakens the immune system. • Several kinds of leishmaniasis • Occurrence: • 12 million cases in world today and increasing • Mostly in South America and parts of Asia • 350 million at risk Adults are similar to this V More Images Related to This Topic V Visceral Leismaniasis (VL) • Commonly called Kala-Azar or Dum Dum Fever • Symptoms: anemia, enlarged liver & spleen, and susceptibility to other diseases because of weakened immune system • Mortality is extremely high in untreated cases • Occurrence: • 90% of cases in Brazil, Sudan, Bangladesh, Nepal, India • 500,000 new cases annually • AIDS increases risk of VL and VL increases risk of AIDS because both diseases weaken immune system • Also, new way of getting VL without sand fly vector --...
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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.
- Spring '07