A volunteer takes the temperature of a visitor at the entrance of the exhibition hall of the China Import and Export Fair, also known as the Canton Fair, in Guangzhou, capital of south China's Guangdong Province, Oct. 23, 2014. China's largest trade fair Canton Fair opened its 116th session in Guangdong on Wednesday, drawing a huge influx of foreign visitors. Authorities have tightened examination to avoid possible spread of Ebola cases. (Xinhua/Liang Xu)

A volunteer takes the temperature of a visitor at the entrance of the exhibition hall of the China Import and Export Fair, also known as the Canton Fair, in Guangzhou, capital of south China's Guangdong Province, Oct. 23, 2014. China's largest trade fair Canton Fair opened its 116th session in Guangdong on Wednesday, drawing a huge influx of foreign visitors. Authorities have tightened examination to avoid possible spread of Ebola cases. (Xinhua/Liang Xu)

A volunteer takes the temperature of a visitor at the entrance of the exhibition hall of the China Import and Export Fair, also known as the Canton Fair, in Guangzhou, capital of south China's Guangdong Province, Oct. 23, 2014. China's largest trade fair Canton Fair opened its 116th session in Guangdong on Wednesday, drawing a huge influx of foreign visitors. Authorities have tightened examination to avoid possible spread of Ebola cases. (Xinhua/Liang Xu)