The prime minister of one of the world’s most vaccinated nations, Israel, told citizens the Pfizer vaccine won’t protect them from the COVID-19 variant that is dominating their nation and the United States.

“People who received two vaccine shots walk around feeling like they are protected … they don’t understand that the second vaccine has faded against the delta — they must quickly get vaccinated with the third dose,” said Israeli Prime Minister Naftali Bennett.

His conclusion comports with a study of U.S. long-term care facilities that found vaccine effectiveness against any COVID-19 infection dropped to 53% in late June to early August.