The epidemiological characteristics and effectiveness of countermeasures to contain coronavirus disease 2019 in Ningbo City, Zhejiang Province, China

Abstract A novel coronavirus (SARS-CoV-2) has spread worldwide and led to high disease burden around the world. This study aimed explore key parameters of SARS-CoV-2 infection assess effectiveness interventions control 2019 (COVID-19). susceptible—exposed—infectious—asymptomatic—recovered (SEIAR) model was developed for assessment. The information each confirmed case asymptomatic collected from Ningbo Center Disease Control Prevention (CDC) calculate in City, China. total 157 COVID-19 cases (including 51 imported 106 secondary cases) 30 infections were reported City. proportion had an increasing trend. elder people lower than younger people, difference statistically significant (Fisher’s Exact Test, P = 0.034). There 22 clusters associated with 167 infections, among which 29 accounting 17.37%. We found that attack rate (SAR) almost same as symptomatic cases, no statistical significance observed ( ? 2 0.052, 0.819) by Kruskal–Wallis test. effective reproduction number R eff ) 1.43, revealed transmissibility moderate. If not been strengthened, duration outbreak would have lasted about 16 months a simulated 44.15%. (TAR) increase along delay intervention. moderate Asymptomatic infections. integrated implemented at different stages during outbreak, turned out be exceedingly