The third case of COVID-19’s Omicron variant was detected in Colorado, marking the third case in the United States. The woman had recent travel history to Africa, according to media reports citing state health officials.

Earlier today, the second case in the United States — that included the Omicron variant— was detected in Minnesota while the first one was found in California on Wednesday.

All three cases that have been found in the country so far have been detected in individuals who were vaccinated against COVID-19.

Also Read: Omicron, first detected in South Africa, may have originated earlier

Officials in Colorado detected the new case in a woman who is a resident of Arapahoe County, an area just east of state capital Denver. She recently traveled to Africa as a tourist, the state health department said in a statement, Associated Press reported.

The woman is fully vaccinated, but had not received her booster shot yet, they said.

Colorado health officials added that the woman was experiencing mild symptoms, adding that her close contacts tested negative for the deadly disease, according to reports from Associated Press.

Much remains unknown about the new variant, including whether it is more contagious, as some health authorities suspect, whether it makes people more seriously ill, and whether it can thwart the vaccine.

Also Read: Does omicron pose greater risk to infants? Scientists explain

Omicron is classified by the World Health Organization as a “variant of concern” as scientists work to determine how it may compare with the predominant delta variant in terms of transmissibility and severity. Scientists also are studying the degree to which existing vaccines and therapies protect against omicron.

Scientists in South Africa first reported it, but the samples came from several countries in southern Africa. And health officials in the Netherlands now say it was found there prior to the South Africa detection.

(With AP inputs)