<div>According to the World Health Organization (WHO), COVID-19 long-haulers are people who experience symptoms such as body ache, fatigue, shortness of breath, headache, difficulty concentrating, loss of taste or smell, or other health issues long after they test negative for the virus. It can be defined as having serious and prolonged symptoms three months after severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection.</div>