He aquí por qué ni una vacuna ni la inmunidad colectiva están garantizadas para detener el COVID-19 | #coronavirus#covid19 | Here's why neither a vaccine or herd immunity is guaranteed to stop COVID-19

Here's why neither a vaccine or herd immunity is guaranteed to stop COVID-19 https://t.co/JEKwGWQtJ8 #coronavirus #covid19 pic.twitter.com/qYrdNbNBNk

— World Economic Forum (@wef) August 23, 2020