//Americans have been shockingly good at getting their second Covid-19 shot

Americans have been shockingly good at getting their second Covid-19 shot

This Los Angeles man, like most of the people who have received at least one dose of the Pfizer or Moderna Covid-19 vaccine, is getting his second shot. | Mario Tama/Getty Images

Patients are usually terrible at getting their second shot. Not with the Covid-19 vaccine.

A new CDC study delivers a different kind of good vaccine news: Americans have been incredibly diligent about getting their second Covid-19 shot.

This was a real concern about the Pfizer/BioNTech and Moderna vaccines, the first two vaccines approved for emergency use in the US, both of which have a two-dose schedule. As I wrote in December, the research literature on other multi-dose vaccines was troubling. Roughly half of patients never got their second or third dose.

One shot of these two-dose Covid-19 vaccines does confer some level of protection, but in order to