Can the BCG vaccination protect you from Covid-19?

A recent study from the US has shown that countries with high BCG vaccination rates have fewer coronavirus deaths. This may be due to the known immunological benefits of the vaccine. Trials have now begun in Australia and The Netherlands to test whether the vaccination can prevent thousands of healthcare workers from becoming infected. To understand this study and the potential behind the findings, we spoke with Luke O'Neill, an immunologist and Professor of Biochemistry at Trinity College.