Vidcast:  https://youtu.be/2olR_GBnm0I   This observation suggests we can save precious CoVid vaccine supplies say virologists and epidemiologists at the University of Maryland.  They suggest this strategy after testing 33 health care workers with proven, previous CoVid infections and 26 uninfected workers.   The data reveals that those with pre-existing anti-CoVid antibodies respond to a first dose of either the Moderna or Pfizer vaccine with an anti-spike antibody peak similar to those receiving a second dose of the vaccine.  Given that those previously infected have some CoVid immunity and pre-existing anti-CoVid antibodies after either a symptomatic or asymptomatic infection, they need only receive  a single dose of a 2-dose vaccine.     https://www.medrxiv.org/content/10.1101/2021.01.30.21250843v1.full.pdf   #CoVid #vaccine #infected