Another physician recently explained to the Globe additional concerns:

As I research the delta variant, it is becoming more clear to me that the current vaccines will soon be rendered obsolete.

The delta variant has numerous mutations on the spike protein.

The spike protein is the only protein on SARS COVID 2 that the vaccines work against.

When a person gets the actual infection, they are immunized against many areas of the virus, but only one protein/area of the virus for the vaccinated. Therefore all previously infected people still recognize the delta variant as COVID whereas the immunized do not. That is why you are seeing tremendous breakthrough infections in the vaccinated.

Therefore it is increasingly unethical to force people to get the vaccines as the efficacy wanes, yet the risks remain.

If the doctor is right, this would be a game changer.