BBC: Moderna said its second-round booster shots are still being tested, but are expected to neutralise different variants of the virus.

Earlier this month, the US firm released positive results from the trials of a modified vaccine aimed at the South African and Brazilian variants.

Stephane Bancel, Moderna chief executive: We appreciate the partnership and support from the government of Australia with this first supply agreement for doses of the Moderna Covid-19 vaccine and our variant booster candidates.

Ok, using the Covid-language-decipher, that implies the current versions don't work against the SA and Brazil variants - otherwise why would you do trials for a all-new-improved one that supposedly does?