On Satuday, the first person to have Ebola in New York City saw symptoms worsen into a more serious phase.

Dr. Craig Spencer entered the Bellevue Hospital Center Thursday with a fever. He now has gastrointestinal symptoms, which is expected to occur.

"People tend to get worse before they get better," said Dr. Mary Bassett, the city's commissioner for health and mental hygiene, according to WNBC, New York.

Craig went to Guinea in West Africa with Doctors Without Borders to help combat the Ebola outbreak.

"When you have Ebola, not the best way to spend your time," the doctor said to The New York Times about returning phone calls to the hundreds of journalists reaching out to him for interviews.

An aid worker who was the second American infected by Ebola, Nancy Writebol, donated blood to Spencer. She too contracted the disease from helping out in West Africa.

Writebol is now Ebola-free after being treated at Emory Hospital in Atlanta, Georgia. Ebola survivors are believed to be the best source of blood transfusions for current patients.

Two people recently recovered received blood transfusions from the first person to be contracted with Ebola in America.

Only one patient in the U.S., Thomas Eric Duncan, has died of the virus.

Since Dr. Spencer was diagnosed with Ebola in New York, Governor Andrew Cuomo announced that health care workers returning from West Africa could serve a mandatory 21-day quarantine regardless of showing symptoms.

New Jersey Gov. Chris Christie announced the mandatory quarantine policy with Cuomo, and the Obama administration immediately lobbied the governors to change it.

A White House statement said, "The President underscored that the steps we take must be guided by the best medical science. He also emphasized that these measures must recognize that health care workers are an indispensable element of our effort ... and should be crafted so as not to unnecessarily discourage those workers from serving."

Cuomo announced Saturday that the policy could be unenforceable.

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