MedSpanish: Ways to prevent transmission of COVID-19

Wash your hands often with soap and water for at least 20 seconds: ​
Lávese las manos frecuentemente con agua y jabón por al menos 20 segundos

Avoid touching your eyes, nose, and mouth:
Evite tocarse los ojos, la nariz o la boca

wear a cloth face covering over your nose and mouth: 
use una mascarilla  de tela para la cara sobre su nariz y boca

Facemask: mascarilla 
(others have translated this to "cubierta" but I have yet to hear someone use this term in practice)
cloth face mask: mascarilla de tela

Cover your cough or sneeze with a tissue, then throw the tissue in the trash: 
Cúbrase con un pañuelo desechable al toser o estornudar y luego bótelo en la basura

Cough: tos
Sneeze: estornudar

Clean and disinfect frequently touched objects and surfaces
Limpie y desinfecte los objetos y superficies de contacto frecuente

​Avoid contact with people who are sick
Evite el contacto cercano con persons que estan enfermas

That's all! Have anything you want me to go over in Spanish? Let me know!