It starts as a case of the sniffles but can end up putting a child in the hospital–or worse. Enterovirus D68 is sweeping through the country, causing, so far, 691 confirmed cases and at least one death. The bug also has been present in at least four other children who died from other illnesses.

Although this virus has been known since 1987, the Centers for Disease Control and Prevention says the strain this year has been particularly brutal:

From mid-August to October 6, 2014, CDC or state public health laboratories have confirmed a total of 594 people in 43 states and the District of Columbia with respiratory illness caused by EV-D68.

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