inclusion criteria: * student at aix marseille university * who has declared that he or she does not carry any risk factor for severe forms of the disease (hcsp criteria of 29/10/2020) * who has declared that he or she does not live under the same roof as a person who does carry such factors, and committed to strictly following the study's health protocol, * carrying a smartphone which is registered on the "tousanticovid" application (with bluetooth activation), and agreeing to install the maela application on the smartphone for remote medical monitoring.

inclusion criteria: * student at aix marseille university * who has declared that he or she does not carry any risk factor for severe forms of the disease (hcsp criteria of 29/10/2020) * who has declared that he or she does not live under the same roof as a person who does carry such factors, and committed to strictly following the study's health protocol, * carrying a smartphone which is registered on the "tousanticovid" application (with bluetooth activation), and agreeing to install the maela application on the smartphone for remote medical monitoring.

inclusion criteria: - student at aix marseille university - who has declared that he or she does not carry any risk factor for severe forms of the disease (hcsp criteria of 29/10/2020) - who has declared that he or she does not live under the same roof as a person who does carry such factors, and committed to strictly following the study's health protocol, - carrying a smartphone which is registered on the "tousanticovid" application (with bluetooth activation), and agreeing to install the maela application on the smartphone for remote medical monitoring.

inclusion criteria: - student at aix marseille university - who has declared that he or she does not carry any risk factor for severe forms of the disease (hcsp criteria of 29/10/2020) - who has declared that he or she does not live under the same roof as a person who does carry such factors, and committed to strictly following the study's health protocol, - carrying a smartphone which is registered on the "tousanticovid" application (with bluetooth activation), and agreeing to install the maela application on the smartphone for remote medical monitoring.