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.

All Chinese workers and foreign laborers who transit in epidemic-hit places in China will not be allowed to enter Vietnam.

Apart from the only case detected on January 17, no other infection has been found in Vietnam's south central province of Khanh Hoa.