The United States now vows vigilance as another health worker who helped treat the first Ebola patient in the country was on Wednesday confirmed to have the same disease.

An announcement from the U.S. Centres for Disease Control and Prevention (CDC) revealed Wednesday that Texas Health Presbyterian Hospital nurse Amber Joy Vinson, another one of the 100 nurses and doctors who helped treat Ebola patient Thomas Eric Duncan, had tested positive of contracting the Ebola virus.

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Vinson is the second nurse confirmed to have caught the virus after 26-year-old Nina Pham, who is currently in clinically stable condition.

Aside from the news of a third Ebola patient in the country, alarms have been raised for a commercial flight as the second 29-year-old Ebola-stricken nurse had reportedly travelled by air from Cleveland to Dallas-Fort Worth on Monday.

According to reports, Vinson initially called the CDC before boarding the Frontier Airlines Flight 1143 and was allowed to travel because she did not have fever at the time.

However, U.S. President Barack Obama stood firm in his decision not to ban flights despite many right-leaning officials calling for him to change his decision.

"I want people to understand that the dangers of you contracting Ebola, the dangers of a serious outbreak, are extraordinarily low, but we are taking this very seriously at the highest levels of government," he explained, adding that he had ordered his aides to closely monitor updates on the spread of the disease in the country "in a much more aggressive way."

Meanwhile, the second medical worker infected did not come as a surprise to the Dallas hospital as federal health officials claimed that other cases were expected.

Dr. Daniel Varga, the chief clinical officer of the hospital where Dallas nurses Vinson and Pham worked, even cited that the continuing diagnosis indicates "evidence that our monitoring program is working."

TagsDallas, texas health presbyterian hospital, outbreak, Virus, West Africa, eric duncan, Nina Pham