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Before stay-at-home orders are lifted, the nation’s public health agencies want to be ready to douse any new sparks of coronavirus infection — a task they say could require tens of thousands more investigators to call people who test positive, track down their contacts and get them into quarantine.

Without the extra help, officials insist, states cannot possibly be ready to resume normal everyday activities, and some agencies are so desperate they are considering recruiting librarians and Peace Corps volunteers to join the effort.

“We are trying to build these teams and processes in the midst of a crisis,” said Sharon Bogan, a public health spokeswoman for Seattle and King County, which are seeking at least 20 more investigators.