By Gretchen Vogel
Faced with short supplies of COVID-19 vaccines and unforeseen side effects, some countries have adopted an unproven strategy: switching shots midstream. (source: sciencemag.org)
By Gretchen Vogel
Faced with short supplies of COVID-19 vaccines and unforeseen side effects, some countries have adopted an unproven strategy: switching shots midstream. (source: sciencemag.org)