<prompt> According to International Health Regulations, there is no risk of spread of yellow Fever if the Aedes aegypti index remains below51108  <response>: International Health Regulations IHRs of WHO covers 7 diseases: Cholera Plague Yellow Fever Smallpox Wild Polio Virus Human Influenza SARSInternational 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 validMosquitoes:- Aircraftsships 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 