Russia claimed its coronavirus vaccine, the first to be registered worldwide, will soon be tested on 40,000 people in order to test its reliability.

The vaccine, called "Sputnik V," has been hailed by Russian authorities as safe and effective after it received domestic regulatory approval earlier this month. Full-scale production is due to start in September.

Health experts and public officials, however, have expressed concern over the proposed vaccine, citing the speed of its approval and the lack of available data. The results of two months of small-scale human trials in Russia have not yet been made available to the public.

"The so-called conditioned registration certificate means that we are obliged to conduct an additional expanded clinical trial," Denis Logunov, deputy director for scientific work of Gamaleya Research Institute of Epidemiology and Microbiology, said in an online briefing on Thursday, according to a translation.

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