Disease X is used by the WHO as a placeholder to describe a disease that’s unknown to medical science as a cause of human infections.Most of the diseases are already known to us like; Ebola, and SARS.
Public health experts believe the next Disease X will be zoonotic, meaning it will originate in wild or domestic animals, then spill over to infect humans. Ebola, HIV/AIDS and COVID-19 were zoonotic outbreaks.
To prevent and combat an outbreak of Disease X, medical experts worldwide are clamoring for an increase in funds to support the surveillance of, and research into, potential pandemic agents.
Stay informed, stay healthy, don't panic.