WhatsApp is a mobile application widely used by Brazilians. According to a survey by Panorama Mobile Time/Opinion Box, 99% of Brazilians' cell phones have the application installed. Another survey, the Global Mobile Consumer Survey Brazil, shows that 80% of Brazilians use it at least once every hour. Forwarded WhatsApp messages have been widely used to propagate false information of all kinds and it has been no different with the new Coronavirus pandemic. False news about miracle cures, conspiracy theories of all sorts and false doctors' statements about social isolation spread like wildfire in a gunpowder fuse. However, there are initiatives that aim to combat disinformation about the pandemic using WhatsApp as a vehicle. The Brazilian Network of Science Journalists and Communicators has developed one of these channels and the organizers will tell about the experience, their strategies, successes and learning curve.