Germany's vaccine advisory panel on Tuesday said one Covid-19 shot was enough for healthy five to 11 year-olds because most of them had already undergone an infection, be it known or undetected. The view by the panel of 18 appointees known as STIKO contrasts with approval by European Union regulators for a two-shot regimen in that age group. US regulators last week even authorized a third, or booster shot for the group. "For children, we have to assume that the rate of....