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EPIDEMIOLOGY OF CHIKUNGUNYA

EPIDEMIOLOGY OF CHIKUNGUNYA. Definition: The study of the distribution and the determinants of health related states or events in specified population and the application of this study to the control of health problems. EPIDEMIOLOGICAL PYRAMID. It includes . VECTOR AND MODE OF TRANSMISSION.

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EPIDEMIOLOGY OF CHIKUNGUNYA

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  1. EPIDEMIOLOGY OF CHIKUNGUNYA Definition: The study of the distribution and the determinants of health related states or events in specified population and the application of this study to the control of health problems

  2. EPIDEMIOLOGICAL PYRAMID • It includes

  3. VECTOR AND MODE OF TRANSMISSION • It’s a vector borne disease • Vector is mosquito belonging to “AEDES” genus • Other diseases caused by Aedes are • DENGUE HAEMORRHAGIC FEVER • YELLOW FEVER • RIFT VALLEY FEVER

  4. DESCRIPTION ABOUT AEDES • Important members causing chickungunya are • Aedes aegypti • Aedes albopictus • Aedes africanus • Aedes furcifer • Aedes taylori • Aedes cordelliri

  5. Aedes aegypti

  6. Aedes mosquito • Abundantly seen in india • Called “TIGER MOSQUITO” (white stripes on the black body) • Favourable climate tropical 27*c • Life span of adult mosquito -15 days • Habitat –mainly indoor-living room,offices, bussiness places, in isolated containers

  7. Breeding habitsArtificial accumulation of water in: • Broken bottles • Discarded tins • Fire brackets • Flower pots • Coconut shells • Earthen pots • Tree holes • Rubber containers • Plastic containers

  8. Breeding places of mosquito

  9. Biting habits • Only the female mosquito bites • Bites mainly in day time • Bites humans and animal • Powerful bites / fearless bites • Bites 3 to 4 times for a satisfactory meal

  10. Rests in dark corners, walls, umbrellas, book shelves, coolers, bed covers. Flies around 100 mts from breeding places This factor helps in its eradication Transported to long distances by aero planes , ship, train. Resting habits Flying habits

  11. Life cycle

  12. MODE OF TRANSMISSION • Only the female Aedes bites(blood meal) • Transmission cycle: Man • Becomes infective after ten days of bite & remains life long infective Mosquito

  13. In Africa • Viruses transmitted in Savanna & forests of Africa by Aedes africanus,Aedes furcifer • Vertebrate portion of the cycle is provided by non human primates like monkeys & Baboons which amplify and maintain virus circulation

  14. In Asia • Virus is primarily transmitted by Aedes aegypti and to a lesser extent by Aedes albopictus in urban areas. • Although Asian monkeys develop significant viraemia after inoculation. But they never have been shown to participate in maintenance or amplification of the virus

  15. GLOBAL OUTBREAK

  16. INDIAN OUTBREAK

  17. Present epidemic in south India • Mainly affected states are • Karnataka , Maharashtra, AP • Recent update on JULY 5th 2006

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