<https://spanishrevolution.net/por-que-es-muy-dificil-reinfectarse-por-sars-cov-2/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://spanishrevolution.net/por-que-es-muy-dificil-reinfectarse-por-sars-cov-2/>