OPV (oral polio vaccine) did this until a doctor rallied enough of his colleagues to tell the CDC and FDA to shove it and only give the IPV in 2000 onward.
The OPV had a staggeringly high chance of becoming activated even if they only gave kids two doses of OPV after two shots of IPV. Kids were being harmed for decades but no one organized an effort to bring it to and end until 1999.
I guarantee that they stopped offering the live virus FluMist vaccine for the same reason.
OPV (oral polio vaccine) did this until a doctor rallied enough of his colleagues to tell the CDC and FDA to shove it and only give the IPV in 2000 onward.
The OPV had a staggeringly high chance of becoming activated even if they only gave kids two doses of OPV after two shots of IPV. Kids were being harmed for decades but no one organized an effort to bring it to and end until 1999.
I guarantee that they stopped offering the live virus FluMist vaccine for the same reason.
I had the oral, on a sugar cube.