"Having multiple platforms can help," says Koff. "So for example, the mRNA platform offers speed, while other platforms may provide additional benefits in terms of ease of shipping around the world or durability of immunity."In each case, the general idea is more or less the same. Whether carried by a nanoparticle or an adenovirus, each vaccine contains a variety of different fragments of the Sars-CoV-2 virus' spike proteins (which the virus uses to bind to human cells to gain access),
