Abstract Disinformation poses a significant threat to democratic societies, particularly in the context of the Covid-19 health crisis. This study delves into the prevalence and nature of disinformation in social media by analyzing Facebook accounts of political actors and alternative media within the unique Swiss landscape during the first wave of the pandemic. Using standardized quantitative content analysis, we categorize posts as either accurate, reconfigured, or fabricated. Our findings reveal a disconcerting pattern: Disinformation was shared more frequently than accurate information. Notably, right-wing politicians and parties, alongside alternative media sources, emerged as the most prolific disseminators of disinformation. Digging deeper, we discovered that the predominant form of disinformation shared on social media was reconfigured disinformation, signifying manipulated or contextually distorted information. This prevalence of reconfigured disinformation on social media platforms raises pressing concerns about the public’s ability to discern fact from fiction. Moreover, our study shines a spotlight on the inadvertent or perhaps deliberate contributions of right-wing politicians and parties and alternative media sources to the propagation of disinformation. By examining this phenomenon within the Swiss context during the initial wave of the pandemic, we provide valuable insights into the dynamics of disinformation and its implications for society during crisis situations.