posted on Jul, 31 2013 @ 03:09 AM
reply to post by AlphaHawk
Thank you for contributing to this thread it is always better to hear two sides of a story IMO.
What do you think caused the vaccine-derived polio virus (VDPV) type 2 in the baby?
Obviously the baby was undervaccinated and unprotected from polio. Also, obviously the child was infected by a vaccine-derived poliovirus from another
person. Therefore, it was the combination of deficient number of doses plus the unlucky event of getting infected with a vaccine-derived virus. Not
every child who gets infected with VDPV will become paralysed — so twice unlucky. END QUOTE:
vaccine-derived poliovirus from another person
What prompted India to adopt OPV and continue with it (despite its problems) even as developed countries switched to IPV years ago?
Decision making was mainly by administrators and not by public health experts or technocrats. And administrators may not be reading scientific
WHO recommended OPV in the Expanded Programme of Immunisation (EPI) and India complied without internal consultations or using Indian
scientific information which spoke against OPV in favour of IPV. Our main problem was very low effectiveness of OPV, which was the reason why India
had inordinate delay in eradicating wild polioviruses. We had to develop Type 1 and Type 3 “monovalent” OPV with higher efficacy to achieve
success in 2011. END QUOTE:
How many injectable vaccine doses are needed and at what time periods to protect a child?
If first dose is given beyond the window of high maternal antibody, namely beyond eight weeks of age, and if second dose is given after an interval of
eight weeks or more, just two doses will protect 100 per cent of children. Many countries follow a three-dose schedule. So perhaps a third dose could
be planned — but no more are needed for very long-term protection. END QUOTE: