China gave itself a mild version, Europe and US meanwhile received a tougher version of the virus so nobody would suspect the Chinese are behind all this.

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Inflict injury on oneself to win the enemy's trust

Pretending to be injured has two possible applications. In the first, the enemy is lulled into relaxing his guard since he no longer considers you to be an immediate threat. The second is a way of ingratiating yourself with your enemy by pretending the injury was caused by a mutual enemy.

[link to en.wikipedia.org (secure)]