(WBAP/KLIF) — Medical City Healthcare began administering the FDA approved COVID-19 vaccine from Pfizer to front line caregivers in Dallas, Thursday. Medical City-Dallas emergency room technician Mahesh Thiagarajah received his inoculation, calling it historic. Medical City hospitals received over 6,800 vaccines Thursday, with thousands more expected over the next few days. Registered nurse Karrie Lawson…… MORE