The poliovirus, which was last seen in Pakistan in September, has now spread to the sewage waters of Egypt, prompting health officials to rush to prevent a polio outbreak. No polio cases have been reported in Cairo, but officials say they are still treating the discovery as a full-blown outbreak. The aggressive reaction is part of a global program to eradicate the poliovirus. Pakistan, Afghanistan and Nigeria still have traces of the poliovirus, though an outbreak in Egypt could change that.
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