As U.S. Vaccinations Ramp Up, Some Recipients Struggle to Secure a Second Dose Last Updated March 13, 2021, 10:17 a.m. ETMarch 13, 2021, 10:17 a.m. ET The Supreme Court lifted some restrictions on religious services in California. China approved its second vaccine. Here’s what you need to know: Patients are observed for adverse reactions after receiving their first Covid-19 vaccine doses in downtown Seattle last month. Scheduling the next dose has not always been a streamlined process.Credit...Grant Hindsley/Agence France-Presse — Getty Images In some American states, people who have received their first dose of a Covid-19 vaccine have been experiencing maddening difficulties as they try to schedule their second.