Managerial statistics question: please provide a detailed answer

1. Although the majority of citizens of Israel are vaccinated (5,634,634; 78.7%), a surge involving the rapidly transmitting Delta variant has led to a conclusion that the vaccines are not effective against Delta. Based on the Israeli government data, Out of 515 patients currently hospitalized with severe cases in Israel, 301 (58.4%) received two doses of the Pfizer vaccine, 214 (41.6%) received one or no dose. Do you think the Vaccine is still effective? Why or why not.