This study first refines the conceptual framework of publics' communicative behavior in social mediated health crises. Then two multiple-item scales for measuring publics' health crisis information seeking and sharing (CISS) are developed and tested by employing online survey data sets from a random national sample of 279 adults and 280 adults in the United States, respectively. Results indicate seven types of crisis information seeking behavior and 17 types of crisis information sharing

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... r crossing over platforms, channels, and information sources. The CISS scales provide a valid and reliable tool for crisis communication researchers and practitioners to measure publics' information seeking and sharing activities in social-mediated public health crisis communication.