. >> doug hall and lisa bartels were among the 500 people who received the first dose of the moderna vaccine. the fda says they're due for their second shot in 28 days. one thing missing on their cdc cards, their next vaccine appointment. >> i'm not overly concerned, no, but i will -- i will check with my doctor at some point. >> i'll get an email they said i think 25 to 35 days. >> reporter: a spokesperson for the city's covid command center says the reason why people did not get their second dose appointment today is because of the inconsistent flow of vaccines. >> what we have is not enough. what we have coming is not enough. >> reporter: the city says they're following the cdc's guidance which just updated their website yesterday to say if it is not feasible to adhere to the recommended interval, the second dose of pfizer and moderna covid-19 vaccines may be scheduled for administration up to six weeks, 42 days after the first dose. >> you know you need that second shot. >> oh, god, yes. excuse me. good lord, yes. >> mayor breed says she spoke to governor newsom yesterday making