Israel has vaccinated some one million people against COVID-19, which is over 10 percent of its 9.2 million residents, the government announced on Sunday.

However, along those vaccinated against the coronavirus in Israel are 240 people who were diagnosed with COVID-19 shortly after being inoculated, The Times of Israel reported.

Since Pfizer’s vaccine takes time to develop antibodies against the SARS-CoV-2 virus and requires injecting two doses of the inoculation, with the second one given 21 days after the first, there is still a risk of contracting COVID-19. It is also noted that if a person was infected before vaccination, they may still be in danger of developing COVID-19 symptoms even after injection.

Moreover, there are concerns that people with immunity can carry the virus and spread it because it is not clear so far whether mucous layers are beyond the reach of antibodies and they could bear virus particles even after a person is vaccinated.

According to government data, the majority of those who received the coronavirus vaccines reported no side effects, although some people sought medical assistance due to weakness, dizziness, fever, and diarrhea, reportedly caused by the vaccination. The Israeli Health Ministry also reported cases of people suffering from allergic reactions and developing neurological symptoms after receiving the shots with the vaccine.

Last week, Israeli media reported that there were four cases where people died after getting vaccinated. Three deaths were proven to be unrelated to the vaccination, while the fourth case is still being investigated.