This dissertation examined how foreign conspiracy theories propagated by authoritarian countries traverse national borders and are transformed into “news” in domestic media systems. It also assessed the impact of these conspiracy theories incorporated into the transnational information campaign as propaganda tools. Using the controversial COVID-19 virus-origin theory as a case study, this dissertation examined how the COVID-19 virus-origin conspiracy theories were constructed as propaganda by Chinese state media and how these conspiracy theories influenced the media in Taiwan, which has historically been the main target of China's information influence activities.

After analyzing COVID-19 virus-origin narratives that contained conspiracy theories propagated by Chinese state media, the study found that the Chinese state media constructed its narratives about the origin of the COVID-19 virus by repeating consistent themes, recurrent terms, and assigning distinctive personalities to key protagonists in news events. The Chinese state media portrayed China as a team player in the international community and collaborated with the international community by sharing data openly. However, the United States and other Western nations attempted to contain the rise of China by attacking it with conspiracy theories about the origin of the virus.

The Chinese narratives were mostly rejected by mainstream Taiwanese media. Although Taiwanese media mentioned some conspiracy theories promoted by Chinese state media, Taiwanese media were aware of Chinese propaganda and disinformation. They also viewed the disputes between China and the United States regarding the origin of the virus as a struggle for power between the two nations. Even though Taiwanese media and Chinese state media used identical terms to describe the same news events about the origin of the COVID-19 virus and highlighted the same protagonists, Taiwanese media presented narratives that were in stark contrast to Chinese media.

The research concluded that Chinese state media had limited influence on Taiwanese media in the case of COVID-19 virus-origin narratives. Nonetheless, this study also uncovered a concerning trend: a number of Taiwanese media articles amplified conspiracy theories disseminated by right-wing American media outlets, such as the War Room, Newsmax, or overseas Chinese media organizations notorious for spreading disinformation. The improper use of foreign media as news sources is one of the vulnerabilities of Taiwanese media in the battle against foreign propaganda and conspiracy theories.

This dissertation increased the understanding of the influence of conspiracy theories propagated by authoritarian regimes and identified elements crucial to their success or failure as propaganda tools. Moreover, it sheds light on the strengths and weaknesses of media systems in democratic nations when battling against foreign propaganda. The findings of this study are useful not only to Taiwan but also to democratic and open societies worldwide.