Israeli doctors find severe Covid-19 breakthrough cases

In Israel's Covid-19 wards, doctors are learning which vaccinated patients are most vulnerable to severe illness, amid growing concerns about instances in which the shots provide less protection against the worst forms of the disease.

Around half of the country's 600 patients presently hospitalised with severe illness have received two doses of the Pfizer shot, a rare occurrence out of 5.4 million fully vaccinated people...