Clade X: A Global Health Security Simulation was a pandemic modelling exercise led by Johns Hopkins University's Center for Health Security, which occurred on Tuesday, May 15, 2018, at the Mandarin Oriental Hotel in Washington, D.C.[1] The exercise was named after a hypothetical novel virus, and simulated efforts to counter a fast-moving and deadly epidemic released on purpose by a terrorist group consisting of scientists and their rich backers wanting to reduce overpopulation.[2][3] In the simulation, the hypothetical pandemic resulted in 900 million simulated deaths.[4] The exercise was invitation-only and nearly 150 people attended.[5]
^Johns Hopkins Center for Health Security (2021-12-16). "About Clade X, a tabletop exercise". Johns Hopkins Center for Health Security. Retrieved 2022-02-06.