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Vaccine-derived polio cases hit 30, experts express worry
Biggest polio threat in years sparks alarms from New York to California
‘Silent’ spread of polio in New York drives CDC to consider additional vaccinations for some people
What is polio? Why are authorities worried about it spreading in London and New York City?
Religion Is Not a Real Barrier to Polio Vaccination
Michigan health leaders on 'high alert' for polio as vaccination rates continue to fall
Why has polio returned to London and New York?
First U.S. polio case in years sparks alarms from New York to California
The 6 most common polio symptoms, from flu-like headaches to muscle pain