Polio double shield in place
The health ministry today launched a new polio vaccine, an
injection to be given to infants alongside the traditional oral vaccine, in the
free immunisation programme to eliminate the risk of a resurgence of the
disease eradicated from India in 2011.
The injectible vaccine that contains
inactivated polio virus (IPV) will be rolled out in the coming weeks in Assam,
Bihar, Gujarat, Madhya Pradesh, Punjab, and Uttar Pradesh before it is expanded
to other states, health minister J.P. Nadda said, announcing the launch.
The ministry will give IPV to infants
below one year of age when they receive the third dose of the oral polio
vaccine (OPV). "New evidence clearly shows that IPV and OPV together
strengthen the (infant's) immune system and provide double protection against
polio," Nadda said.
But sections of paediatricians say the
move is not in line with standard immunisation practices adopted across India's
private health care sector where IPV has been available for nearly a decade.
The Indian Academy of Paediatrics prescribes three doses of IPV - at six weeks,
10 weeks and 14 weeks.
"This one-dose IPV strategy
appears to be a stop-gap manoeuvre," Vipin Vashishtha, a paediatrician in
Bijnore and a member of the paediatrics academy's advisory committee on vaccines,
told PG Times.
"Under the IAP guidelines, we use three doses of IPV along with OPV."
However, a senior ministry official
said the initiative with IPV should be viewed differently from the use of this
vaccine in the private sector. "In the government programme, we're
introducing IPV only as an additional risk-protection tool," said the official.
"We will continue to provide OPV, IPV is only to boost immunity just
before we switch from a three-component OPV to a two-component OPV next
year."
The World Health Organisation (WHO) in
May this year had recommended the introduction of IPV as part of a global polio
endgame strategy to roll out IPV in 126 countries to prevent the resurgence of
polio that has been eradicated by all but two countries: Afghanistan and
Pakistan.
Virologists have long expressed concern
that live but weakened polio viruses in OPV, which are shed by immunised
infants in stools, have the potential to survive in sewage, regain their
virulence and cause vaccine-derived polio in poorly-immunised children who
ingest them through contaminated water.
The immunisation programme in April
2016 is expected to switch to a two-component OPV, eliminating from OPV one of
three types of wild poliovirus eradicated in 1999. "The introduction of
IPV is in preparation for the switch to this bivalent OPV," the ministry
official said.
India will require nearly 80 million
doses of IPV to ensure that all 27 million children born each year receive
three doses of IPV as prescribed.