In connection with the outbreak of six fever cases in Jongju City of North Phyongan Province and Sinhung County of South Hamgyong Province on Friday evening, members of rapid mobile anti-epidemic teams and rapid diagnosis and treatment teams from relevant emergency anti-epidemic organs carried out various strict experiments and tests, including epidemiological test, observational study and PCR test. This scientifically clarified that fever was caused by other diseases like gastroenteritis.