Israel reported on Monday a decrease in the effectiveness of the Pfizer/BioNTech COVID-19 vaccine in preventing infections and symptomatic illness but said it remained highly effective in preventing serious illness. The decline coincided with the spread of the Delta variant and the end of social distancing restrictions in Israel. Vaccine effectiveness in preventing both infection and symptomatic disease fell to 64% since June 6, the Health Ministry said. At the same time the vaccine was 93% effective in preventing hospitalizations and serious illness from the coronavirus.