Answer:
Vietnam.
Explanation:
According to the World Bank, the countries described above have the following populations:
China - 1.393 billion
Vietnam - 95.54 million
Philippines - 106.7 million
North Korea - 25.55 million.
Besides, the World Health Organization presents the following data of the coronavirus cases (May 6, 2020):
China - 82883
Vietnam - 271
Philippines - 10004
North Korea - Unknown
Hence, the country with reportedly low number of coronavirus cases is Vietnam.