"So we do ask both those currently eligible and those that will be newly eligible to be patient as supply increases," she said. Getting an appointment will become more difficult April 15, when everyone aged 16 and up becomes eligible for the shots. That group includes an estimated 5 million people, although about 1 million are believed to have already received at least one dose, Ferrer said. She stressed that the age-based categories of eligibility are reserved for county residents only. Categories of essential workers eligible for the shots were open to people who worked in the county, regardless of residence. The county last week officially crossed the 4 million mark in total COVID-19 doses administered. According to the Department of Public Health, a total of 4,013,521 doses had been administered in the county as of last Saturday. That includes 1,323,686 second doses, equating to the number of people who are now fully vaccinated.