Disease X is a placeholder name used by the World Health Organization (WHO) for an as-yet-unknown pathogen with epidemic or pandemic potential. It could be a completely new virus, bacteria, or other germ, or even a known pathogen that gains the ability to spread more easily.
The emergence of new diseases is a constant threat. Our close contact with animals and the environment creates opportunities for germs to jump species and infect humans. Additionally, increased travel and globalization can rapidly spread a new disease.
The good news is that scientists and public health officials are preparing for Disease X. Research is ongoing into developing broad-spectrum vaccines and treatments that could be effective against a variety of pathogens. Additionally, surveillance systems are being strengthened to detect new outbreaks quickly.
There's no way to predict what Disease X will be, but there are steps you can take to protect yourself from any infectious disease: