According to the tracker, there are over 152,000 cases in Spain, over 139,000 in Italy, over 113,000 in Germany and over 83,000 in France.
In many cases, an epicurve follows a bell curve, steadily rising to a peak and then declining as the outbreak burns out when the virus runs out of people to infect.
We have three levels of case definition: suspected, probable and confirmed cases.
Data for Italy before August 17 2020, has been adjusted to redistribute from March, April and May that the Parma Local Health Authority had not previously reported.
Each line is the seven-day moving average, which smooths out day-to-day anomalies in how the data are reported by authorities.
On October 5 2020, the health ministry said a in cumulative cases and deaths was due to the inclusion of data dating back to June.