A sudden change in federal guidelines on coronavirus testing came this week as a result of pressure from the upper ranks of the Trump administration, a federal health official close to the process tells CNN.

"It's coming from the top down," the official said of the new directive from the Centers for Disease Control and Prevention.

The new guidelines raise the bar on who should get tested, advising that some people without symptoms probably don't need it -- even if they've been in close contact with an infected person.

Previously, the CDC said viral testing was appropriate for people with recent or suspected exposure, even if they were asymptomatic.

CDC would not comment on questions about its own policy change. A CDC spokesperson referred all questions to the Department of Health and Human Services.

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