FDA Drug Approval process ? Drug discovery- 3-6 pre discovery ? Preclinical- ? Clinical trials- it has three phases about 5-7 years and number of volunteers are above one thousand ? FDA review- basically took 0.5 to 2 years. ? Scale up Some examples of Childhood disease preventable by vaccination • Diphtheria • measles • Hepatitis A • Hepatitis B • Influenza • Measles • Tetanus Measles: in the last one and half century measles has claimed more than 200, OOO,000 lives people worldwide