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Union, July 23rd. The Ministry of health of Israel said 22, according to the data tracked from June 20th to July 17th, the Pfizer vaccine's efficiency on COVID-19 has dropped to 39%, and at the same time, the decline in efficiency is the prevalence of Delta variant in Israel. According to the statistics, among the people vaccinated in January this year, the effective rate of the vaccine was only 16%; Among the people vaccinated in February, the effective rate was only 44%. The latest data and the two previous effective data released by Israel have decreased significantly, the latter being 64% from June 6 to July 3 and 94.3% from May 2 to June 5, respectively p>