By Valerie Volcovici

WASHINGTON (Reuters) -Nine former directors of the Centers for Disease Control and Prevention under Republican and Democratic presidents warned on Monday that the decisions made by U.S. Secretary of Health and Human Services Robert F. Kennedy Jr., culminating in the firing of the CDC's director, are putting Americans' health at risk.

The warning, laid out in a guest opinion essay in the New York Times, comes days after the Trump administration fired Susan Monarez, less than a month into her tenure and four other directors resigned in protest, deepening disarray at the nation's main public health agency.

Monarez had refused to adopt new limitations on the availability of some vaccines urged by Kennedy, saying they went against scientific evidence.

The nine essay aut

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