Researchers take part in a drill at the newly-completed lab in Wuhan, capital of central China's Hubei Province, Jan. 30, 2015. China completed its first high level biosafety laboratory based in Wuhan Saturday in Wuhan after more than a decade of construction. The lab will be used to study class four pathogens (P4), which refers to the most virulent viruses that pose a high risk of aerosol-transmitted person-to-person infections. (Xinhua/Yin Gang)

A researcher puts on a protective suit before entering the newly-completed lab in Wuhan, capital of central China's Hubei Province, Jan. 30, 2015. China completed its first high level biosafety laboratory based in Wuhan Saturday in Wuhan after more than a decade of construction. The lab will be used to study class four pathogens (P4), which refers to the most virulent viruses that pose a high risk of aerosol-transmitted person-to-person infections. (Xinhua/Yin Gang)

Researchers take part in a drill at the newly-completed lab in Wuhan, capital of central China's Hubei Province, Jan. 30, 2015. China completed its first high level biosafety laboratory based in Wuhan Saturday in Wuhan after more than a decade of construction. The lab will be used to study class four pathogens (P4), which refers to the most virulent viruses that pose a high risk of aerosol-transmitted person-to-person infections. (Xinhua/Yin Gang)

Staff members celebrate during the completion ceremony of China's first high level biosafety laboratory in Wuhan, capital of central China's Hubei Province, Jan. 31, 2015. China completed its first high level biosafety laboratory based in Wuhan Saturday in Wuhan after more than a decade of construction. The lab will be used to study class four pathogens (P4), which refers to the most virulent viruses that pose a high risk of aerosol-transmitted person-to-person infections. (Xinhua/Yin Gang)

A researcher takes part in a drill at the newly-completed lab in Wuhan, capital of central China's Hubei Province, Jan. 30, 2015. China completed its first high level biosafety laboratory based in Wuhan Saturday in Wuhan after more than a decade of construction. The lab will be used to study class four pathogens (P4), which refers to the most virulent viruses that pose a high risk of aerosol-transmitted person-to-person infections. (Xinhua/Yin Gang)

Researchers wearing protective suits enter the newly-completed lab in Wuhan, capital of central China's Hubei Province, Jan. 30, 2015. China completed its first high level biosafety laboratory based in Wuhan Saturday in Wuhan after more than a decade of construction. The lab will be used to study class four pathogens (P4), which refers to the most virulent viruses that pose a high risk of aerosol-transmitted person-to-person infections. (Xinhua/Yin Gang)

A researcher takes part in a drill at the newly-completed lab in Wuhan, capital of central China's Hubei Province, Jan. 30, 2015. China completed its first high level biosafety laboratory based in Wuhan Saturday in Wuhan after more than a decade of construction. The lab will be used to study class four pathogens (P4), which refers to the most virulent viruses that pose a high risk of aerosol-transmitted person-to-person infections. (Xinhua/Yin Gang)

A researcher puts on a protective suit before entering the newly-completed lab in Wuhan, capital of central China's Hubei Province, Jan. 30, 2015. China completed its first high level biosafety laboratory based in Wuhan Saturday in Wuhan after more than a decade of construction. The lab will be used to study class four pathogens (P4), which refers to the most virulent viruses that pose a high risk of aerosol-transmitted person-to-person infections. (Xinhua/Yin Gang)

A researcher takes part in a drill at the newly-completed lab in Wuhan, capital of central China's Hubei Province, Jan. 30, 2015. China completed its first high level biosafety laboratory based in Wuhan Saturday in Wuhan after more than a decade of construction. The lab will be used to study class four pathogens (P4), which refers to the most virulent viruses that pose a high risk of aerosol-transmitted person-to-person infections. (Xinhua/Yin Gang)