Here it is from the Vietnam Ministry of Foreign Affairs.
Temporary regulatory change on entry, exit for foreigners
The Covid-19 has been spreading swiftly in a complex manner on a large scale across the world. The Government of Viet Nam has decided to:
(i) temporarily suspend entry for tourist who come from the Schengen countries and/or the United Kingdom of Great Britain and Northern Ireland, or have visited or transited through these areas within 14 days preceding their expected entry into Viet Nam;
(ii) suspend visa upon arrival for all foreign nationals. This decision will be effective from 12:00 (noon), 15 March 2020 for 30 days, and not be applicable to entrants for diplomatic or official purposes.
Foreigners who are experts, business managers, highly skilled workers entering Viet Nam will be medical checked and quarantine shall be applied in accordance with the guidelines of the Ministry of Health.
Viet Nam has informed all diplomatic missions, consular offices and representative offices of international organizations in Viet Nam of the decision, and will maintain close monitor the epidemic and collaboration with other countries, international organizations and partners to promptly adjust prevention and control measures for the Covid-19./.
http://www.mofa.gov.vn/en/nr04080710414 ... 0314083802