The expansion of COVID-19 vaccine eligibility to everyone age 50 and older will be the biggest test yet for California’s vaccine effort, which has stabilized recently but still faces questions about whether supply and appointments can keep pace with demand.

Millions more Californians qualify for a shot starting Thursday, and in two weeks, all residents 16 and older will be eligible.

For most people, actually getting a dose will involve wading into California’s vast array of appointment websites run by local health departments, private health providers and clinics, several major pharmacy chains and the state, through a portal called My Turn.

Public health officials are urging newly eligible people to be patient while searching for an appointment because the supply of vaccine doses coming from the federal government is still constrained in some places. Officials in several major counties have said they could vaccinate far more people if they received more supplies.

Read the full story on LATimes.com.