Russia ships only first part of COVID-19 vaccine to Argentina -sources
MOSCOW (Reuters) - 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 told Reuters.
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.