If you or your child develops any of the symptoms (there is even the most minimal fever or if a cough develops), you are advised to call 808 24 24 24 (SNS24) for advice and to report your condition. (You will hear an options menu in Portuguese. Click "1 "and we have been assured that you will get a person who can speak English.) Also, please let us know (firstname.lastname@example.org).
PhD students at the Champalimaud Foundation decided to create an online document to centralize information and keep updating the measures the Portuguese Government is implementing - translated to English. Please note this is not an official document, it is a volunteering service from PhD students. Thank you to them for this service! In their words: “As a big disclaimer, we are trying to be as accurate as we can - if you are following the measures, let us know if we have made any mistakes, and or if you want to help, just drop us an email and we'll add you to the team that edits the document.”
Here are a few links from different reliable sources to keep up to date:
Center for Disease Control
Health Ministry site
European Center for Disease Prevention and Control
World Health Organization