With a third Covid-19 vaccine now authorized in the United States, distribution is set to ramp up in the coming weeks. Courthouse News talked to medical experts about possible vaccine side effects, and what to know before booking an appointment. Volunteers and health care workers carry out a mass vaccination campaign at the former site of a Sears department store in a partnership with San Diego County, the city of Chula Vista and Sharp HealthCare. (Courthouse News photo/Barbara Leonard) (CN) — As the United States closes in on three months of the Covid-19 vaccine rollout, more than 57 million people have been able to receive at least one shot. The recent authorization of the Johnson & Johnson vaccine means more Americans will be able to make an appointment soon.