Even if France is officially past the peak of the Covid-19 pandemic, new cases are still emerging. And as the country enters its third phase of lockdown, the only way to stop it becoming vulnerable to the coronavirus again is to track and trace any interactions with an infected person. So how do the regional health authorities carry out this crucial work? Our France 2 colleagues bring us this report from the northern Hauts-de-France region, with FRANCE 24's Solange Mougin.
