Solve This (? + ? + ?=30)
If 1111=R, 2222=T, 3333=E, 4444=N Then 5555=?
Guess the Hindi Muhawara from the following whatsapp Emoticons?
Sweet, Medicine, Film, Girl, City, Car, Place, Doggy all are name same, guess which word it is?
Guess me who am I, I am the first on earth, the second in heaven...
The first polio vaccine was the inactivated polio vaccine. It was developed by Jonas Salk and came into use in 1955. The oral polio vaccine was developed by Albert Sabin and came into commercial use in 1961.
The first Polio vaccine in form of 'injected dose' was developed by Jonas Salk in 1952. Later, who developed first Oral Polio Vaccine (OPV) in sixties ?