Multi-Vac Approach (General)
"The nation’s top scientific advisers could recommend the rollout of a second round of immunisations to achieve herd immunity if the original vaccine program fails to control the spread of COVID-19."
https://www.theaustralian.com.au/nation/coronavirus-australia-live-news-double-vaccine-... (paywall)
Sounds like the nations' top scientific advisers' plan is to jab people with anything and everything until they find something that works. I wonder if any safety trials have been done that combine two different vaccines administered to the same person?