Eventually, as the city works its way through vaccine distribution tiers — starting with health-care workers and essential workers at high risk of catching the virus — the clinic will be open to the general public. Philly Fighting COVID says all Philadelphians who want the vaccine can sign up on their website to “pre-commit” to getting a vaccine. Because vaccine supplies are limited and the city is still working its way through distribution tiers, people who sign up will not immediately be given an appointment, but they will receive updates on the vaccine distribution process and when it’s their turn.