temps (durée) (1) vitesse (1) sécurité (1) risque (1) recherche (1) besoin (1) anticorps (1) hygiène (1) ménage (1) dose (1) âge (1) taux (1) Context (1) Complications (1) Care and hygiene (1) Prevention (1) Protection (1) Vaccines (1) Vaccination (1) Transplantation of organs, tissues, etc (1) Time (1) Speed (1) Risk (1) Research (1) Population (1) Poor (1) Messenger RNA (1) Immunosuppression (1) Immunization (1) Hygiene (1)