Last modified on Thu 6 May 2021 09.13 EDT Good morning. The US has declared its support for a patent waiver for Covid-19 vaccines, in an attempt to enable more widespread access to vaccines around the world. The head of the World Health Organization welcomed the move as a âmonumental moment in the fight against Covid-19â. India and South Africa have been supporting a waiver since October, along with about 100 emerging economies. However, wealthier countries have been blocking a debate on the issue at the WTO. What will a waiver mean? At the moment, coronavirus vaccines are considere...