Abstract:Objective To analyze the epidemiological characteristics of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) cases imported from abroad in Henan Province, and to provide related prevention and control guidance. Methods SARS-CoV-2 cases imported from abroad in Henan Province served as the research subjects, and their epidemiological data and laboratory tests information were collected and analyzed using descriptive study method. Results As of March 14, 2022, a total of 752 SARS-CoV-2 cases imported from abroad were reported in Henan Province, with the attack rate of 1.20% in inbound individuals. There were 196 confirmed cases (26.06%) and 556 asymptomatic cases (73.94%). Of the confirmed cases, 105 (53.57%) had mild clinical symptoms and 91 (46.43%) general infections, with no severe cases or deaths. The median (P25, P75) of the cycle threshold value for ORF1ab gene was 34.15 (24.08, 37.09), and that for N gene was 34.19 (24.04, 36.75). The median (P25, P75) of the interval between the day of the entry and the first positive test was 0 (0, 2) day. A total of 20 (2.93%) cases were SARS-CoV-2 positive for the first time after 14 days of entry, among whom 18 cases had inter-provincial mobility after discharge. The re-positive rate of the casesimported from abroadwas 1.99%, without secondary cases. The imported cases roserapidly in 2022, of which 562 (74.73%) were male cases and 190 (25.27%) were female cases, and the median (P25, P75) of the age was 31 (26, 42) years. Most of the cases were migrant workers (23.14%), household workers and theunemployed (23.14%), commercial staff (14.23%) and overseas students (13.69%). The main original countries were Russian Federation (30.32%), Philippines (17.15%) and Ukraine (13.43%). 516 (85.29%) cases had inter-provincial mobility. 31 clustering outbreaks with five or more infection cases occurred on flights, of which 5 clustering outbreaks had 10 or more cases, and a case on a flight from Myanmar to Zhengzhou on July 4, 2021 caused the domestic epidemic. Conclusion The attack rate of SARS-CoV-2 infection among inbound individuals in Henan Province was relatively low, with mild clinical conditions. The imported cases in 2022 increased rapidly. Most of the imported cases were confirmed within a week after inbound. The spread resulting from re-positive cases was not reported.
王海峰, 王艺康, 潘静静, 王莹莹, 范威, 王文华, 李亚飞, 王若琳, 叶莹, 黄学勇. 河南省境外输入新型冠状病毒感染病例流行病学特征分析[J]. 实用预防医学, 2023, 30(2): 161-164.
WANG Hai-feng, WANG Yi-kang, PAN Jing-jing, WANG Ying-ying, FAN Wei, WANG Wen-hua, LI Ya-fei, WANG Ruo-lin, YE Ying, HUANG Xue-yong. Epidemiological characteristics of imported cases of SARS-CoV-2 infection in Henan Province. , 2023, 30(2): 161-164.