DUBLIN – Three different vaccine technologies are being deployed in the desperate global effort to combat the SARS-CoV-2 virus, but Rino Rappuoli, chief scientist at the GSK Vaccines arm of Glaxosmithkline plc, said he sees traditional protein-based adjuvanted subunit vaccines, the trusted workhorse of infectious disease prevention, as offering the best bet for delivering a safe and effective vaccine at scale, within the tight timescales necessitated by the present crisis.