U.S. Centers For Disease Control And Prevention

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This undated photo provided by the U.S. Centers for Disease Control and Prevention (CDC) shows a blacklegged tick — also known as a deer tick. (CDC via AP) **FILE**

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This undated photo provided by the U.S. Centers for Disease Control and Prevention (CDC) shows a blacklegged tick - also known as a deer tick. With a bumper crop of blacklegged ticks possible this season, researchers in a Lyme disease-plagued part of New York's Hudson Valley are tackling tick problems across entire neighborhoods with fungal sprays and bait boxes. (CDC via AP)

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Director of the U.S. Centers for Disease Control and Prevention Tom Frieden is sworn in as he testifies in front of The House Energy and Commerce Subcommittee on Oversight and Investigations on Ebola diagnosing mistakes as well as protecting healthcare workers in Dallas on Capitol Hill, Washington, D.C., Thursday, October 16, 2014. (Andrew Harnik/The Washington Times)

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Director of the U.S. Centers for Disease Control and Prevention Tom Frieden testifies in front of The House Energy and Commerce Subcommittee on Oversight and Investigations on Ebola diagnosing mistakes as well as protecting healthcare workers in Dallas on Capitol Hill, Washington, D.C., Thursday, October 16, 2014. (Andrew Harnik/The Washington Times)

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Director of the U.S. Centers for Disease Control and Prevention Tom Frieden testifies in front of The House Energy and Commerce Subcommittee on Oversight and Investigations on Ebola diagnosing mistakes as well as protecting healthcare workers in Dallas on Capitol Hill on Thursday. (Andrew Harnik/The Washington Times)

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Director of the U.S. Centers for Disease Control and Prevention Tom Frieden testifies in front of The House Energy and Commerce Subcommittee on Oversight and Investigations on Ebola diagnosing mistakes as well as protecting healthcare workers in Dallas on Capitol Hill, Washington, D.C., Thursday, October 16, 2014. (Andrew Harnik/The Washington Times)

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Director of the U.S. Centers for Disease Control and Prevention Tom Frieden testifies in front of The House Energy and Commerce Subcommittee on Oversight and Investigations on Ebola diagnosing mistakes as well as protecting healthcare workers in Dallas on Capitol Hill, Washington, D.C., Thursday, October 16, 2014. (Andrew Harnik/The Washington Times)

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Health and Human Services Secretary Kathleen Sebelius speaks on the release of the US Centers for Disease Control and Prevention (CDC) report on the 'The Health Consequence of Smoking 50 Years of Progress', Friday, Jan. 17, 2014, in the South Court Auditorium in the Eisenhower Executive Office Building on the White House complex in Washington. (AP Photo/Pablo Martinez Monsivais)