The coronavirus has spread to at least 44 states and Washington, D.C., after Wyoming announced its first case.

The patient is a woman from Sheridan County who has a recent history of domestic travel, according to the Wyoming Department of Health. The state agency said it is working to identify and contact anyone who may have come into contact with the person.

Washington's Snohomish Health District reported the county's third death, raising the U.S. death toll to at least 38.

Photos: The Coronavirus Hits the U.S. View All 14 Images

Washington, which is the hardest hit state in the U.S., has recorded at least 30 deaths from the virus, which causes a disease called COVID-19.

California on Wednesday night announced it would follow Washington state in banning gatherings of more than 250 people. The governor's office said the ban would last until the end of March and that smaller gatherings can happen if people stand 6 feet apart.

"Changing our actions for a short period of time will save the life of one or more people you know," Gov. Gavin Newsom said in a statement.

President Donald Trump addressed the nation from the Oval Office on Wednesday night, saying he would ban all travel from Europe, but the Department of Homeland Security said this would only apply to most foreign nationals who have been in certain European countries in the 14 days prior to their planned entry into the U.S.