Europe OKs Johnson & Johnson's COVID-19 vaccine, but deliveries won't start till April

Europe's COVID-19 immunization campaign has been challenged by early supply problems and now safety concerns for AstraZeneca’s shot. A fourth vaccine is now on its way—though it's not going to fix the supply shortfall immediately. European Commission officials on Thursday endorsed J&J’s coronavirus shot for use in member countries, making the vaccine the first one-dose option to score an approval there. The vaccine won't be available now, though; J&J said it expects to begin European deliveries in the second half of April. Meanwhile, J&J is scaling up its EU supply chain with aims to deliver 200 million doses to the continent this year. Worldwide, the company is pushing to produce 1 billion doses in 2021.