title: Smallpox; main sources of infection in the Mexican Republic.
mesh_terms: D001699:Biometry; D012899:Smallpox / Q000453:epidemiology* / Q000706:statistics & numerical data*; D012901:Variola virus
keywords: SMALLPOX/epidemiology and statistics
vernacular_title: VIRUELA; principales focos de infección en la República mexicana.