Coronavirus: Israel offers booster shots to children as young as 12; Switzerland warns of terror attacks on vaccine sites

Israel has begun offering a Covid-19 booster to vaccinated people as young as 12, and its prime minister said a campaign that began a month ago among seniors has slowed a rise in severe illness caused by the Delta variant.Announcing the decision, top Israeli health officials said the effectiveness of the second dose of the Pfizer-BioNTech vaccine waned six months after administration, making a booster necessary.“The third dose brings us to the level of protection achieved by the second dose,…