<prompt> WHO declared global eradication of small pox on -26th October 19775th July 197517th May 19758th May 1980  <response>: Ans. is 4d i.e., 8th May 1980 Small poxo It was an acute infectious disease caused by Variola virus.o It is the only infectious disease which has been eradicated globally. The worlds last case occured in Somalia on 26 October 1977. The WHO declared on 8 may 1980 that smallpox had been eradicatedo In April 1977, India was declared smallpox free. The last idiginous case in India occured on 17 may 1975 in Bihar and Indias last known case of smallpox was an importation from Bangladesh, which occured on 24 May 1975.o The epidemiological basis which have led to small-pox eradication are :i No-known animal reservoirii No long-term carrieriii Life-long immunity after recovery from diseaseiv Sub-clinical infections not transmitting diseasev Highly effective vaccinevi Easy detection of casevii International cooperation 