https://www.selleckchem.com/products/way-316606.html Multiple regression analyses showed that poor mental health (adjusted odds ratio 2.17 [95%CI 1.45-3.25]) promoted new onset of Internet addiction and Internet addiction (adjusted odds ratio 2.39 [95%CI 1.36-4.20]) also promoted new onset of poor mental health. Internet addiction and poor mental health status each increased the risk of onset of the other. Adolescents, their parents and schools need to take policies to use properly Internet. Internet addiction and poor mental health status each increased the risk of onset of the other. Adolescents, their parents and schools need to take policies to use properly Internet. The Coronavirus disease 2019 (COVID-19) pandemic outbreak has led to travel bans and restricted social contact. Sudden decrease of social activities can easily trigger social anxiety, especially for community youths. Existing studies have inconclusive results regarding whether the development of youths' social anxiety can be predicted by psychological capital. This study aims to clarify the influence mechanisms of psychological capital and coping style on social anxiety during the COVID-19 pandemic outbreak. Overall 600 community youths with ages of 18-22 yr in Northeast China were randomly selected and voluntarily answered the online questionnaire survey in Mar 2020. General information questionnaire form, positive psychological capital questionnaire, social interaction anxiety scale, and simple coping style questionnaire were used to obtain the participants' information. Psychological capital has a medium negative correlation with social anxiety, low positive correlation with positive coping ( = -0.42, 0.38), and low negative correlation with negative coping ( = -0.19). Social anxiety is negatively correlated with positive coping to a small degree and positively correlated with negative coping at a medium level ( = -0.16, 0.43). Positive coping has a low positive correlation with negative coping (