Disease X is a mysterious disease, meaning not much is known about it. There is not much information about its causes and how to prevent and treat it. According to WHO, it is a flu-like disease which is highly infectious and the death rate is also increasing due to it. 143 people have died due to Disease X, most of whom were children. Disease X is contagious, meaning it can spread from one person to another. Due to disease X, WHO has emphasized on surveillance, rapid response, research and collaboration. Disease X can affect the elderly, immuno-compromised people and people suffering from any kind of health condition. Disease X can spread very quickly, which can cause economic and social disorders.