
Arcturus Therapeutics’s Kostaive (zapomeran, ARCT-154) self-amplifying mRNA COVID-19 vaccine is said to force cells in the body to produce SARS-CoV-2 spike protein—detectable in draining lymph nodes for at least 28 days—and a replicase enzyme that makes more copies of the vaccine mRNA, with the enzyme itself detectable for up to 15 days














