Vaccines, after six months the effectiveness drops to 50% what those who wait risk

How does the effectiveness of vaccines change after six months?

According to the Higher Institute of Health, six months after the completion of the vaccination cycle, “there is a sharp decrease in vaccination efficacy in preventing diagnoses in all age groups”. If transmission of the infection is observed, the efficacy increases from 76% in the vaccinated with a full course within six months compared to the unvaccinated, to 50% in the vaccinated with a full course beyond six months.