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Food Sources May Affect the Symptom Rates of COVID-19, an Epidemiological Analysis Based on the Public Data in Gansu Province, China, During the Summer Epidemic Cycle in 2022

Published online by Cambridge University Press:  11 April 2023

Rui Xu*
School of Nursing, Gansu University of Chinese Medicine, Lanzhou, P. R. China
Jin-Peng Hu
Center for Grassland Microbiome, Lanzhou University, Lanzhou, P. R. China
Li-Li Chen
Cancer Epidemiology Research Center, Gansu Provincial Cancer Hospital, Lanzhou, P. R. China
Jun-Fang Miao
School of Nursing, Gansu University of Chinese Medicine, Lanzhou, P. R. China
Qiang Wang
School of Basic Medicine, Gansu University of Chinese Medicine, Lanzhou, P. R. China
Ji-Jun Hu
Affiliated Hospital of Gansu Medical College, Pingliang, P. R. China
Xu-Hong Chang
School of Public Health, Lanzhou University, Lanzhou, P. R. China
Jin-Lin Zhang*
Center for Grassland Microbiome, Lanzhou University, Lanzhou, P. R. China
Corresponding authors: Rui Xu, Email:; Jin-Lin Zhang, Email:
Corresponding authors: Rui Xu, Email:; Jin-Lin Zhang, Email:


According to the public data collected from the Health Commission of Gansu Province, China, regarding the COVID-19 pandemic during the summer epidemic cycle in 2022, the epidemiological analysis showed that the pandemic spread stability and the symptom rate (the number of confirmed cases divided by the sum of the number of asymptomatic cases and the number of confirmed cases) of COVID-19 were different among 3 main epidemic regions, Lanzhou, Linxia, and Gannan; both the symptom rate and the daily instantaneous symptom rate (daily number of confirmed cases divided by the sum of daily number of asymptomatic cases and daily number of confirmed cases) in Lanzhou were substantially higher than those in Linxia and Gannan. The difference in the food sources due to the high difference of the population ethnic composition in the 3 regions was probably the main driver for the difference of the symptom rates among the 3 regions. This work provides potential values for prevention and control of COVID-19 in different regions.

Brief Report
© The Author(s), 2023. Published by Cambridge University Press on behalf of Society for Disaster Medicine and Public Health, Inc.

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