On Thursday, health officials in Texas were monitoring 100 people for signs of Ebola. They closed down four close family members to stay home as the authorities investigate the first case of the disease in the U.S.

Thomas Eric Duncan traveled from Liberia to Texas, where he was diagnosed earlier this week with Ebola.

The chief of Centers for Disease Control and Prevention, Tom Frieden said, that Duncan did not have a fever when he departed from Liberia. The patient began to feel sick on September 24 reported CNN.

Thomas Duncan soon showed symptoms of the disease such as a fever, vomiting, and diarrhea. Once these symptoms start they can infect others who come in contact with their bodily fluids.

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After seeking medical help, he was sent home. Over a four day span he was contagious while being in contact with people.

Tom Frieden said, “About 100 people who had potential contact with Duncan are being assessed.”

“We have identified a handful of people who may have had exposure, people from the household and healthcare settings as well.” said Frieden

So far fourteen people have tested negative. There will be continuous testing and precautions being taken place in Texas until the Ebola is out of Texas.