Widespread vaccinations against Covid-19 are not expected until the middle of next year, according to the World Health Organization, which has stressed the importance of rigorous checks on their effectiveness and safety. 'This phase 3 must take longer because we need to see how truly protective the vaccine is and we also need to see how safe it is,' said spokeswoman Margaret Harris, referring to vaccine clinical trials Subscribe to Guardian News on YouTube ► http://bit.ly/guardianwiressub Global coronavirus updates – live ► https://www.theguardian.com/world/liv... CDC’s autumn vaccine hint fuels fears of pressure from Trump ► https://www.theguardian.com/us-news/2... Support the Guardian ► https://support.theguardian.com/contr... Today in Focus podcast ► https://www.theguardian.com/news/seri... The Guardian YouTube network: The Guardian ► / theguardian Owen Jones talks ► http://bit.ly/subsowenjones Guardian Football ► http://is.gd/guardianfootball Guardian Sport ► http://bit.ly/GDNsport Guardian Culture ► http://is.gd/guardianculture