Up to this point, one of OPV's greatest advantages was that its attenuated viruses could spread just like wild polio, moving through the air and immunizing unvaccinated individuals.
Newborns of immunized mothers are protected through passive immunity and hygiene standards have been improved even in the developing world, so the umbilical cords are usually cut with sterile equipment.
The WHO says people who are fully immunized should hold off on getting a third shot while so many people in the world are still waiting for their first.
Many of the lawmakers are intent on overturning a longstanding federal law that immunizes those companies from lawsuits over user-generated content and putting tough regulations in place.
The challenges we have are all logistic and security about combining 75,000 personnel and I now waiting up to go and immunize about 9.86 million children.