March 2022, ScientificAmerican.com 37
SCALING UP
VACCINES:
The Pfizer-
BioNTech
mRNA vaccine
became a major
protective
shield against
COVID. This
time-lapse
image shows
technicians at
BioNTech’s
facility in Mar-
burg, Germany,
filtering batches
of the vaccine,
in one of the
final stages
before shipping
Luca Locatelli/INSTITUTEit out.