Omni Healthcare is allowing people to walk in for a COVID-19 vaccine at its Melbourne location for a limited time.Omni Healthcare said it has received a substantial shipment of Moderna last week, making it possible for the clinic to accept walk-ins through Friday until 5 p.m. Floridians 18 and older eligible to receive the vaccine. However, the clinic will still accept appointments. COVID@OMNIhealthcare.com