After acknowledging a key mistake in its vaccine dosage, AstraZeneca said that "additional study" was to validate the efficacy of the vaccine. Watch: The British drugmaker had earlier said that average efficacy of the vaccine was 70 per cent.

AstraZeneca says COVID-19 vaccine need 'additional study'

On the status of major coronavirus vaccine candidates that are underway, WION gets you the development from around the world. Watch report.

COVID-19 Pandemic: Moderna's COVID-19 vaccine appears safe

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AstraZeneca says COVID-19 vaccine need 'additional study'

COVID-19 Pandemic: Moderna's COVID-19 vaccine appears safe