Jacksonville seniors begin getting 2nd doses of COVID-19 this week Different sites have appointment proceedures, vaccines Published: Updated: Tags: JACKSONVILLE, Fla. – The city of Jacksonville began giving second doses of the COVID-19 vaccine to the general public at two senior centers on Monday and the state is administering second shots at Prime Osborn Convention Center. Between the three sites, about 2,000 people are expected to receive their second doses each day for the next couple of weeks. That’s nearly double the average number of people in Jacksonville who have been receiving their first dose in recent days because vaccine supplies are still limited.