Polio-like Virus in California

US doctors are warning of an emerging polio-like disease in California where up to 20 people have been infected. The US is polio-free, but related viruses can also attack the nervous system leading to paralysis. Polio is a dangerous and feared childhood infection. The virus rapidly invades the nervous system and causes paralysis in one in 200 cases. It can be fatal if it stops the lungs from working.

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