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Originally Posted by FireFly
Pardon me, you're right. Not polio.
Regardless "essentially" the same means there have been changes. There have been changes in the vaccines and vaccination schedule since my oldest was born in 2015 to what my youngest has received since she was born in 2020. Even if they are 'essentially' the same and she is getting the same protections, there have been changes.
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Sure, but that has nothing to do with safety. Vaccines get reformulated for practical reasons, like combining multiple vaccines into one shot (the current polio vaccine is part of the DTaP-HB-IPV-Hib vaccine which covers 6 diseases), or in some cases to extend the shelf life or make handling requirements simpler. Ultimately, the polio vaccines in use today are the same as the originals. They use 3 serotypes of inactivated polio viruses (Salk IPV vaccine) or live attenuated viruses (Sabin OPV vaccine). The safety profile of each hasn't changed or been improved upon in the 60+ years that they've existed.