Before the September 11 attacks on the United States in 2001, the World Health Organization proposed the destruction of all the known remaining stocks of smallpox virus that were kept in laboratories in the US and Russia.
Enne 11. septembri terrorirünnakuid 2001. aastal tegi Maailma Terviseorganisatsioon ettepaneku hävitada kõik teadaolevad rõugeviiruste varud Ameerika Ühendriikide ja Venemaa laborites.