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Michael Barrett is professor of biochemical parasitology at the University of Glasgow
The question of how long our antibodies last will determine the future impact of the disease, and our response to it.
In the UK, a lack of testing has left us struggling to identify active cases of Covid-19. Developing a way to identify those who have already had the disease will be critical to fighting back.
Why are some people worse affected by Covid-19 (and other viruses) than others? Estimates of the fatality rate vary from country to country.
The likelihood is that millions in the UK will become infected: schools should be closed and major gatherings cancelled.
The discovery of hundreds of cases in Italy has made the spread of the disease in the UK almost inevitable.
How one person can accelerate a pandemic.
Funding from governments and the pharmaceutical industry to tackle infectious diseases has been waning for years.
The disease is spreading with terrifying speed but crucial lessons have been learned from previous epidemics.
New drugs have made the elimination of horrific conditions such as sleeping sickness feasible.
More than 1,100 cases of measels have been reported in England this year, as the anti-vax movement causes an alarming surge across the globe.