A former Pfizer employee has made multiple false claims regarding the pandemic on social media, including that those who have had the common cold are immune to SARS-CoV-2, or COVID-19. The common cold is caused by several different types of viruses, not just coronaviruses. While research is being done on how different types of virus exposure may inhibit COVID-19 transmission, no findings have been conclusive. The Journal has debunked several of his claims.