New Merck pneumonia vaccine OK'd in US weeks after Pfizer's
U.S. regulators have approved a new pneumonia vaccine from Merck, more than a month after OK'ing an improved version of rival Pfizer's shot. Both new shots offer better protection…
U.S. regulators have approved a new pneumonia vaccine from Merck, more than a month after OK'ing an improved version of rival Pfizer's shot. Both new shots offer better protection…