Investigation on Influenza A and B Virus from People Entering China via the Tianjin Port in 2019

Results: A total of 1605 throat swabs were collected. The results of quantitative RT-PCR showed that there were 40 (2.5%) cases of influenza A virus positive. No significant differences were found in gender, age and country distribution. However, in terms of entry time, the positive rate of influenza A virus was the highest in the first quarter compared with other quarters, and the difference was statistically significant. At the same time, there were 13 (0.8%) cases of influenza B virus positive in this survey. No significant differences were found in gender, country distribution and entry time, but in terms of the age of entry personnel, the positive detection rate of children and young people with influenza B infection was higher, and the difference between different age groups was statistically significant.