text: After the reported death by<unk>  accident in 1978, all known stocks of the virus were destroyed. Today only the United States CDC and Russian State Research Center of Virology and Biotechnology VECTOR have the virus in their laboratories for research purposes.
option_0: Smallpox post eradication
option_1: Smallpox future or investigational therapies
option_2: Smallpox case studies
option_3: Smallpox eradication
option_4: Zika virus infection travel notice
option_5: HIV condoms, needles, and negotiation
option_6: HIV coinfection with tuberculosis prevention
option_7: Smallpox epidemiology and demographics