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What is According to International Health Regulations, there is no risk of spread of yellow Fever if the Aedes aegypti index remains below and explain in detail?
International Health Regulations (IHRs) of WHO covers 7 diseases:

– Cholera
– Plague
– Yellow Fever
– Smallpox
– Wild Polio Virus
– Human Influenza
– SARS

International measures to restrict the spread of Yellow Fever (IHRs):

– Travellers:
- Must possess a valid International certificate of vaccination (validity 10days – 10yrs) against YF before they enter ‘YF receptive areas’
- If no such certificate available: Quarantine for 6 days (Max I.P of YF) from date of leaving an infected area
- If traveller arrives before certificate becomes valid (10 days after vaccination): Isolate till it becomes valid
Mosquitoes:
- Aircrafts/ships arriving from endemic areas: Aerosol spray to kill insect vectors
- Airports/ seaports kept free from vector breeding: at least 400 meters around boundary
- Aedes aegypti index: kept below 1%