At least 13 Israelis have suffered mild facial paralysis as a side effect after getting the Pfizer vaccine.

According to the Ynet report, doctors estimate that the number of similar cases could be higher and are questioning if they should administer the second dose of the vaccine to those who suffered facial paralysis.

However, the country’s health ministry recommends they should go ahead, but only if the paralysis passes, the report says.

The Israeli government signed a deal with Pfizer and BioNTech in November for 8 million doses of their COVID-19 vaccine. More than 20 percent of Israel’s 9 million citizens has so far received the first vaccine dose since the rollout began. At least two elderly people with chronic underlying conditions died after being inoculated.