As Covid-19 Vaccine Development Pushes Ahead, Researchers Probe Safety – The Wall Street Journal

In 2017, scientists discovered that some children who got a new vaccine versus the tropical disease dengue later came down with a severe case of the disease, forcing production to momentarily stop. Now, scientists developing coronavirus vaccines aim to avoid a comparable fate that might hold up fast-moving efforts to suppress the pandemic.

The scientists say they have actually developed Covid-19 vaccines in manner ins which aim to make sure they battle infections, rather than worsen them.