It’s proving to be a hopeful spring in California — the state has the lowest COVID-19 case rate in the United States. ••• California’s coronavirus hospitalizations hit all-time low ••• State officials are poised to loosen California’s mask mandate. ••• But younger Californians have the lowest vaccination rate, sparking concern. ••• And in other parts of the country and world the virus is surging — namely in India, where cases topped 18 million as gravediggers work around the clock. ••• The U.S. will restrict travel from India starting Tuesday.