Califf said a decision authorizing that approach could come “within days.”
That would require another declaration, to allow the government to alter its guidelines on how to administer the vaccine, officials said.
Health officials pointed to a study published in 2015 that found that Jynneos vaccine administered that way was as effective at stimulating the immune system as when the needle plunger deeper into other tissue.
But experts also have acknowledged they are still gathering information on how well the conventional administration of one or two full doses works against the outbreak.
Others health organizations have made declarations similar to the one issued by HHS.
Last week, the World Health Organization called monkeypox a public health emergency, with cases in more than 70 countries. A global emergency is WHO’s highest level of alert, but the designation does not necessarily mean a disease is particularly transmissible or lethal.
California, Illinois and New York have all made declarations in the last week, as have New York City, San Francisco and San Diego County.
The declaration of a national public health emergency and the naming of a monkeypox czar are “symbolic actions,” said Gregg Gonsalves, a Yale University infectious diseases expert.
What’s important is that the government is taking the necessary steps to control the outbreak and — if it comes to that — to have a plan for how to deal with monkeypox if it becomes endemic, he said.
Monkeypox is endemic in parts of Africa, where people have been infected through bites from rodents or small animals. It does not usually spread easily among people.
But in May, a wave of unexpected cases began emerging in Europe and the United States. Now more than 26,000 cases have been reported in countries that traditionally have not seen monkeypox.
___
Associated Press Health Writer Matthew Perrone contributed to this report.