Study shows Pfizer vaccine immunity wanes

(KYMA, KECY/ CNN) - Two new studies suggest Covid-19 immunity from Pfizer's vaccine wanes after about two month.

But, the shots continue to reduce the risk of hospitalization or death.

The first study followed 4,800 Israeli healthcare workers and it shows the lowered immunity is worse in men, senior citizens and people with immune system issues.

The second study looks at real-world outcomes in Qatar and that showed immunity was highest a month after a second dose, then gradually fades.

That country has high vaccination rate -- and most people there got the Pfizer shots.