2018-2019 Influenza Season Week 12 ending March 23, 2019 [Spanish]Hay una visi\uf3n general del sistema de vigilancia de la influenza de los CDC, incluida su metodolog\ueda y descripciones detalladas de cada componente, disponible en: http://www.cdc.gov/flu/weekly/overview.htm.Sinopsis: Influenza activity decreased but remains elevated in the United States. Influenza A(H1N1)pdm09 viruses predominated from October to mid-February and influenza A(H3N2) viruses have been more commonly identified since late February. Small numbers of influenza B viruses have also been reported. Below is a summary of the key influenza indicators for the week ending March 23, 2019\u2022 Vigilancia viral: The percentage of respiratory specimens testing positive fo...