Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Contact matrices during national lockdown, France, April 2020
Frequency of individual close contacts at less than 1 m per day according to age of participant (x-axis) and age of the contact (y-axis).
All contacts weighted using the French population distribution [8] and professional activity distributions during lockdown (COVID-19 Barometer).
