Some 1.1 billion teenagers and young adults are at risk of hearing loss due to the unsafe use of personal audio devices, including smartphones, and exposure to damaging levels of sound at noisy entertainment venues such as nightclubs, bars and sporting events, according to the World Health Organization (WHO).

CDC Director Tom Frieden, M.D., M.P.H. reported on his visits last week to Guinea, Liberia and Sierra Leone and called for immediate steps across nations to accelerate response to the Ebola epidemic in West Africa, according to a press release issued September 2 by the CDC.