Coronavirus vaccination appointments canceled in D.C. region as health officials confront scarce supply Jenna Portnoy, Rachel Chason, Rebecca Tan, Hannah Natanson Prince George’s County closed coronavirus vaccination appointments to nonresidents on Monday, and Inova Health System canceled thousands of appointments for Fairfax County teachers as providers across the Washington region scrambled to compensate for a limited supply of vaccine doses. Prince George’s halted vaccination appointments for nonresidents who were eager to get the shot wherever it was available. County Executive Angela D. Alsobrooks (D) said the county canceled the appointments after hearing from residents who were unable to secure a time slot amid growing competition for doses.