That seems to be disputed too, this is an interesting read: Increases in COVID-19 are unrelated to levels of vaccination across 68 countries and 2947 counties in the United States.[0]
> At the country-level, there appears to be no discernable relationship between percentage of population fully vaccinated and new COVID-19 cases in the last 7 days
> Notably, Israel with over 60% of their population fully vaccinated had the highest COVID-19 cases per 1 million people in the last 7 days. The lack of a meaningful association between percentage population fully vaccinated and new COVID-19 cases is further exemplified, for instance, by comparison of Iceland and Portugal. Both countries have over 75% of their population fully vaccinated and have more COVID-19 cases per 1 million people than countries such as Vietnam and South Africa that have around 10% of their population fully vaccinated.
> There also appears to be no significant signaling of COVID-19 cases decreasing with higher percentages of population fully vaccinated
Of course that could be different for third world countries.
> At the country-level, there appears to be no discernable relationship between percentage of population fully vaccinated and new COVID-19 cases in the last 7 days
> Notably, Israel with over 60% of their population fully vaccinated had the highest COVID-19 cases per 1 million people in the last 7 days. The lack of a meaningful association between percentage population fully vaccinated and new COVID-19 cases is further exemplified, for instance, by comparison of Iceland and Portugal. Both countries have over 75% of their population fully vaccinated and have more COVID-19 cases per 1 million people than countries such as Vietnam and South Africa that have around 10% of their population fully vaccinated.
> There also appears to be no significant signaling of COVID-19 cases decreasing with higher percentages of population fully vaccinated
Of course that could be different for third world countries.
[0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8481107/