2 Rosas-Taraco Rosas-Taraco AG AG Arce-Mendoza Arce-Mendoza AY AY Caballero-OlínG Caballero-OlínG Caballero-OlínG Salinas-Carmona Salinas-Carmona MC MC Mycobacterium tuberculosis up regulates co receptors CCR5 and CXCR4 while HIV modulates CD14 favoring concurrent infection Mycobacterium tuberculosis up regulates co receptors CCR5 and CXCR4 while HIV modulates CD14 favoring concurrent infection IDSResHumRetroviruses. Here, CXCR4 is linked to infection.