As the recommendations change almost daily, it is a good idea to check your local travel restrictions before you start.
Websites with local travel advisories:
Australia:
https://www.smartraveller.gov.au/
UK:
https://www.gov.uk/
New Zeeland:
https://www.safetravel.govt.nz/
Austria
http://www.bmeia.gv.at/reise-aufenthalt/reiseinformation/laender/
Belgium
http://diplomatie.belgium.be/
Bulgaria
http://www.mfa.bg/
Croatia
http://www.mvep.hr/
Cyprus
http://www.mfa.gov.cy/
Czech Republic
http://www.mzv.cz/jnp/
Denmark
http://um.dk/
Estonia
http://www.vm.ee/
Finland
http://formin.finland.fi/
France
http://www.diplomatie.gouv.fr/fr/conseils-aux-voyageurs/
Germany
https://www.auswaertiges-amt.de/
https://www.rki.de/
Greece
http://www.mfa.gr/
Hungary
http://www.kormany.hu/en/ministry-of-foreign-affairs-and-trade
Ireland
https://www.dfa.ie/
Italy
http://www.esteri.it/mae/it/
Latvia
http://www.mfa.gov.lv/
Lithuania
http://www.urm.lt/
Luxembourg
http://www.gouvernement.lu/maee
Malta
http://foreignaffairs.gov.mt/
Netherlands
https://www.government.nl/ministries/ministry-of-foreign-affairs
Poland
http://www.msz.gov.pl/
Portugal
http://www.portugal.gov.pt/
Romania
http://www.mae.ro/
Slovakia
http://www.foreign.gov.sk/
Slovenia
http://www.mzz.gov.si/
Spain
http://exteriores.gob.es/
Sweden
http://www.regeringen.se/sveriges-regering/utrikesdepartementet/
US:
https://travel.state.gov
Canada:
https://travel.gc.ca/