On January 5, 2021, a 45-year-old individual salesperson from Heilongjiang took the K350 train (11 train No. 13) from Heilongjiang Nancha to Harbin West Railway Station.

Seats 27 and 28 of Car 11, not far from his seat, are a middle-aged couple who returned to Changchun from Wangkui County, Suihua City.

  On January 11, the above-mentioned middle-aged couple in Wangkui's return was determined to be asymptomatic.

On January 12, in response to the information pushed by Heilongjiang Province, Tonghua City immediately traced the individual marketing staff and performed a nucleic acid test on him. The test result was positive. After consultation with the clinical expert group, he was diagnosed as an asymptomatic infection.

This trainer is the "asymptomatic infected person notified on January 13th 3" that Jilin Province will repeatedly mention in the epidemic notification in the future.

  The flow survey found that this trainer had conducted training and lectures at the Aishan Hanbang Health Center in Fanjiatun Town, Gongzhuling City on January 8, and at the Tonghua Yuansheng Quality Life Workshop from January 10 to 11.

The two places immediately launched a large-scale investigation.

  On January 13, among the employees of Tonghua Yuansheng Quality Life Workshop, 4 cases of asymptomatic infections associated with them were detected.

  On January 14, two new cases of asymptomatic infections were reported in Jilin, namely, the person in charge of Yuansheng Quality Life Workshop in Tonghua City, and the staff of Aishan Hanbang Health Center in Fanjiatun Town, Gongzhuling City (living in Songyuan City).

  On January 15, there were 14 new cases of asymptomatic infections in Jilin, 13 of which were related to the imported asymptomatic infections 3 from Heilongjiang Province notified on January 13, that is, the above-mentioned trainers.

Among these 13 people, 7 are from Tonghua City and 6 are from Gongzhuling City; 12 are students and 1 is the student's husband.

All 13 people are elderly, among them the oldest is 81 years old and the youngest is 64 years old.

  On January 16, there were 13 new cases of asymptomatic infections in Jilin, all from Gongzhuling City, all of which were related to the imported asymptomatic infections 3 in Heilongjiang Province notified on January 13.

Among them, 10 were trainees participating in the training and 3 were trainees' family members.

Nine of the 13 people are over 60 years old, and the oldest is an 83-year-old woman.

  On January 17, Jilin added 10 newly confirmed local cases, 6 of which were converted from asymptomatic infections previously notified to confirmed cases. The newly confirmed cases were all discovered through active screening during the isolation medical observation period.

The 4 newly confirmed cases all participated in the training course on January 10. The 4 persons were 88, 74, 73, and 73 years old.

  It is worth noting that the trainer who caused the large-scale infection also turned from asymptomatic infection to confirmed case on this day.

  There were 63 new cases of asymptomatic infections, 62 of which were related to the imported asymptomatic infections 3 in Heilongjiang Province notified on January 13, 45 people directly participated in the training at the Yuansheng Quality Life Workshop in Tonghua City on January 10 Teach.

  So far, the asymptomatic infection 3 reported on January 13 (converted to a confirmed case on January 16) has directly or indirectly infected 98 people in Jilin Province, including 78 in Tonghua City, 19 in Gongzhuling City, and 1 in Songyuan City.

There were 9 confirmed cases (6 in Tonghua City, 3 in Gongzhuling City) and 89 asymptomatic infections.

  Reporter Yang Meng