A Suitable Spike Position?

Researchers at London's Francis Crick Institute think they've identified a specific area of Sars-CoV-2 spike protein that would be a good candidate for a pan coronavirus vaccine (https://www.theguardian.com/world/2022/jul/27/uk-scientists-take-promising-step-towards-single-covid-and-cold-vaccine). The S2 subunit of the Sars-CoV-2 spike protein appears to be less subject to mutations than other regions. The S2 subunit is also shared by the Common cold virus. If a vaccine can be raised, producing antibodies against this region, if could offer protection against all the Covid19 variants and the Common cold!