In this study ,the participants will be enrolled sequentially in the COVID-19 care referral centers. The infected hospitalized patient will be identified by the physicians in hospital. After the patient has given his/her informed consent the permission will be sought from him to approach his household contacts. The household contacts will be screened, and included in the study.~Patients hospitalized and positive for COVID-19 by PCR and their household contacts of all ages and gender (40% minimum of female), will be enrolled upon receipt of written informed consent.
The purpose of this study is to Understand the natural history of Coronavirus 2019 (COVID-19) infection to better define the period of infectiousness and transmissibility and to establish biobanks of COVID-19 blood and mucosal samples.