 Britain's medicine regulator has approved Johnson & Johnson's COVID-19 vaccine for use, making it the fourth COVID-19 shot available for use in the country. Britain also caught its order for the single-dose shot, also known as J&J Unit Johnson's vaccine amid issues with the company's supply chain and reports of rare blood clots. Britain has given two-thirds of the population a first dose of COVID-19 and the government cited the unprecedented skill and pace of the rollout as behind the decision to cut its order to 20 million doses from the original order of 30 million doses. Britain has given two-thirds of the population a first dose of COVID-19 and the government cited the unprecedented skill and pace of the rollout as behind the decision to cut its order to 20 million doses from the original order of 30 million doses from the original order of 30 million doses.