WASHINGTON — Federal health officials scrambled Friday to get coronavirus testing up and running in every state, as the Trump administration signaled it may also invoke a 70-year-old defense law to guarantee the availability of protective gear should the virus spread.

The Centers for Disease Control and Prevention said two more Americans tested positive for the virus out of the group of quarantined passengers from the Diamond Princess cruise ship, and Santa Clara County in California reported another case, bringing the national total to 63.

And the World Health Organization upgraded the risk level from the virus to “very high” as it continued to spread around the globe. Financial markets continued to slide, with the Dow Jones average suffering its worst week since the 2008 financial crisis.

Trump administration political appointees and nonpartisan career government scientists both agree that the current risk to Americans is low, although that could quickly change. But some political officials are continuing to offer assurances that concerns will blow over soon, while the scientists are emphasizing preparations for circumstances as yet unknown.

On Capitol Hill, lawmakers of both parties are working on a spending bill to be unveiled early next week and expected to be two to three times the $2.5 billion the White House had requested for anti-virus efforts.

Health and Human Services Secretary Alex Azar called attention to the breadth of options under consideration, telling reporters the administration may invoke the 1950 Defense Production Act to ensure production of needed supplies for anti-virus effort. Dr. Nancy Messonier, the CDC’s chief of respiratory diseases, told reporters the goal is to have every state capable of testing for the virus by the end of next week.