Childhood immunization uptake exceeds 95% in many countries. So vaccinating "most of the world" is clearly do-able. In the situation where uptake is low, the is

Childhood immunization uptake exceeds 95% in many countries. So vaccinating "most of the world" is clearly do-able. In the situation where uptake is low, the issues revolve around supply, access and parental ignorance, and not the cost of the vaccine. Eg. http://www.scielosp.org/scielo.php?pid=S0042-96862008000600003&script=sci_arttext http://www.scielosp.org/scielo.php?pid=S0042-968620080006000...