London — The world will need more than one Covid-19 vaccine so drug companies must partner in the race to develop the weapons to fight the novel coronavirus, GlaxoSmithKline CEO Emma Walmsley said on Wednesday.

Glaxo and Sanofi said on Tuesday they would develop a vaccine to fight the fast-spreading coronavirus. The drugmakers said they expected to start clinical trials for the vaccine in the second half of 2020. If successful, the vaccine would be available in the second half of 2021...

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