https://www.has-sante.fr/jcms/p_3306402/fr/mesure-de-la-charge-virale-quantification-de-l-acide-ribonucleique-du-virus-de-l-immunodeficience-humaine-de-type-2-vih-2-argumentaire 2021 France health technology assessment human immunodeficiency virus, nos measures Virus viruses Viruses weights and measures viral load human immunodeficiency virus type 2 humans ribonucleic acid, nos virus, nos RNA HIV-2