The action comes as WHO convenes its emergency committee to consider if the outbreak of monkeypox - mostly in Europe - warrants being declared a global emergency.
In a bid to stem the rising case tally, the New York City Health Department opened a clinic Thursday to roll out the two-dose Jynneous vaccine - which is 85 percent effective.
Health officials have begun to ship monkeypox virus tests to five commercial laboratories. There are now 156 confirmed monkeypox and orthopoxvirus cases in the U.S.
HHS is sending tests to large commercial labs while other labs are prepping assays as part of what some suggest is a more coordinated response than that to COVID-19.