Pfizer vaccine | ‘Don’t get carried away with over optimism’: UK PM Boris Johnson

UK PM Boris Johnson urged the British public to not get carried away with 'over optimism'. The UK became the first country to approve the Pfizer vaccine against Covid-19. The go-ahead for the vaccine developed by Pfizer and BioNTech comes on the day Britain's latest lockdown ended. However, Johnson said that there are immense logistical challenges. “But there are immense logistical challenges: the vaccine must be stored at minus 70 degrees and each person needs two injections, three weeks apart. So it will inevitably take some months before all the most vulnerable are protected,” he said. Watch the full video for more details.