1.
Ortíz Serrano M, Sanabria Martínez EE, Torres Díaz AD. Intranasal immunization as a preventive measure against SARS-CoV-2. Alerta (San Salvador) [Internet]. 2023 Jul. 19 [cited 2024 Aug. 17];6(2):187-8. Available from: https://camjol.info/index.php/alerta/article/view/16398