Khanh Hoa is the first locality in Vietnam to detect a human-to-human transmission case so far.

The working teams will keep an eye on the epidemic which leaves more than 60 suspected cases so far.

Vietnam declares the national epidemic after the country found six infected cases, including one under human-to-human transmission.

Prime Minister Nguyen Xuan Phuc asked citizens to stay home and limit travel.

The declaration comes at a time when the coronavirus has been found in more than 20 cities and provinces and the infection count has exceeded 200.