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A survey of 582 respondents who had experienced the pandemic lockdown or quarantine in China revealed that exposure to information from both formal and alternative sources reduces risk uncertainty. Exposure to information from formal sources increases public trust while exposure to alternative sources shows no significant association with public trust. Risk uncertainty has a direct negative effect on altruistic behavior and an indirect negative effect mediated by self-efficacy. Public trust exerts a positive effect on altruistic behavior mediated by self-efficacy. 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