Pennsylvania has asked the United States Centers for Disease Control and Prevention (CDC) for help containing an expanding measles outbreak that has seen several people die, but says it will withdraw the request unless the federal agency recognises four measles-associated deaths reported by the state. The CDC, however, said it has not been properly notified of any such request. The US is currently seeing the worst measles outbreak in the country since 1991, with several deaths over the last couple of years. Measles was declared eliminated in the US in 2000, but has made a comeback in recent years, which some have linked to a rise in vaccine scepticism . The US state of Pennsylvania has been hit especially hard.
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