The Israeli government has approved a second COVID-19 vaccine booster shot for people with weakened immune systems, such as cancer patients and organ transplant recipients. It comes after the country’s Pandemic Expert Committee last week recommended the fourth shot of the Pfizer-BioNTech vaccine for immunocompromised people, people older than 60, and health care workers. “Today, I approved giving the fourth vaccine to the immunosuppressed, sick people with diseases and treatments that are hurting the immune system,” Nachman Ash, director general of the Israeli Health Ministry, told a news conference on Thursday. “I did this based on research that is showing the benefits of the vaccine, including the fourth vaccine, for that population, and in light of the concerns that they are more vulnerable to the outburst of [the Omicron variant]. We will continue to track the data on a daily basis and we will see if we need to broaden this recommendation to an …