Kaiser Permanente says a lack of supply has led to the slow and messy vaccine rollout among their patients, many of whom have described frustratingly long waits only to be told there are no available appointments. In an email sent to patients over the weekend, CEO Greg Adams acknowledged these concerns and explained just how bad the vaccine shortage is. He said Kaiser cares for 9.3 million Californians and has so far received only 300,000 doses. That averages to roughly 43,000 doses a week since the vaccine first shipped to California in mid-December. If that rate continues, it means it would take roughly 216 weeks -- or just over 4 years -- to have enough of the first dose for all of Kaiser's California patients.