People who contract the novel coronavirus emit high amounts of virus very early on in their infection,
according to a new study from Germany that helps to explain the rapid and efficient way in which the virus has spread around the world.
At the same time, the study suggests that while people with mild infections can still test positive by throat swabs for days and even weeks after their illness,
those who are only mildly sick are likely not still infectious by about 10 days after they start to experience symptoms.
The study, by scientists in Berlin and Munich,
is one of the first outside China to look at clinical data from patients who have been diagnosed with Covid-19, the disease caused by the coronavirus,
and one of the first to try to map when people infected with the virus can infect others.