Dr ##aper : We have vaccines to fight nearly 30 diseases . After decades of foreign aid , national investments and philanthropic giving that has produced an impressive record of results , we need a decisive win . The world is close to eradicating the polio virus , a disease that once widespread , crippled many . Chatterjee : Myths and myths pose an obstacle to eliminating polio . He says vaccines are most powerful tools to improve public health .
Dr ##aper : We have vaccines to fight nearly 30 diseases . The world is close to eradicating the polio virus , a disease that once widespread , crippled many . Chatterjee : Myths and myths pose an obstacle to eliminating polio . He says vaccines are most powerful tools to improve public health .