Moscow — Russia’s first big international shipment of its coronavirus vaccine — 300,000 doses sent to Argentina last week — consisted only of the first dose of the two-shot vaccine, which is easier to make than the second dose, sources have said.

Unlike most other Covid-19 vaccines, which are given as two shots of the same product, the Russian Sputnik V vaccine relies on two doses delivered using different inactive viruses, known as vectors. The Gamaleya Institute that developed the vaccine says it is more than 91% effective after the two-dose course...

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