According to a study in the British Medical Journal, dementia, memory loss, headaches, and fatigue may be symptoms caused by infection of the SARS-CoV-2 virus. The pandemic has been going on for two years, and the medical community has now gained a better understanding of the sequelae of the COVID-19 disease. We spoke with Dr. Yuhong Dong, Chief Scientific Officer of a Swiss biotech company and expert in antiviral drug development and infectious diseases, about why this happens. Some who contract the disease suffer from what is often called “long Covid,” where various symptoms persist long term.  “Long-term COVID symptoms have created a considerable social burden on society as a whole. A survey of more than 4.3 million comployees, published on February 8 by the Chartered Institute of Personnel and Development (CIPD), a human resources group, found that a quarter of British employees cited chronic COVID symptoms as the main …