DALLAS (CBSNewYork/AP) -- A flight from John F. Kennedy International Airport was the center of an investigation in Los Angeles because of a sick passenger.
As CBS 2's Hazel Sanchez reported, police at Los Angeles International Airport said a passenger who was showing symptoms of the Ebola virus was being evaluated, CBS 2's Hazel Sanchez reported.
Officials later said they believed the passenger was suffering from airsickness, 1010 WINS reported.
"There were simple airline illness. If you were on a boat for a long time and you were going up and down, those are the same symptoms that this patient would have been exhibiting," Los Angeles Fire Captain Jamie Moore said during a news conference. "Being in a confined space, not being able to get fresh air, not being able to see outside, just feeling general motion sickness."
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The passenger was on board United Airlines Flight 703, which landed at the airport just before 5 p.m. EST.
There is also another possible case of Ebola in Boston, CBS 2 reported.
A man who had been to Liberia went to the hospital complaining of headaches and muscle aches. He is currently being evaluated at Beth Israel Deaconess Medical Center.
Meanwhile a Texas health care worker tested positive for Ebola even though she wore full protective gear while caring for a hospitalized patient who later died from the virus, health officials said Sunday.
The U.S. Centers for Disease Control and Prevention has confirmed the nurse tested positive for the virus, making it the first known case of the disease being contracted or transmitted in the U.S., Sanchez reported.
Dr. Tom Frieden, head of the CDC, said the diagnosis shows there was a clear breach of safety protocol and all those who treated Thomas Eric Duncan are now considered potentially exposed.
The worker wore a gown, gloves, mask and shield while she cared for Duncan during his second visit to Texas Health Presbyterian Hospital, said Dr. Daniel Varga of Texas Health Resources, which runs the hospital. Frieden said the worker has not been able to identify a specific breach of protocol that might have led to her being infected.
Duncan, who arrived in the U.S. from Liberia to visit family on Sept. 20, first sought medical care for fever and abdominal pain on Sept. 25. He told a nurse he had traveled from Africa, but he was sent home. He returned Sept. 28 and was placed in isolation because of suspected Ebola. He died Wednesday.
Liberia is one of the three West African countries most affected by the ongoing Ebola epidemic, which has killed more than 4,000 people, according to World Health Organization figures published Friday. The others are Sierra Leone and Guinea.
Texas health officials have been closely monitoring nearly 50 people who had or may have had close contact with Duncan in the days after he started showing symptoms.
The health care worker reported a fever Friday night as part of a self-monitoring regimen required by the CDC, Varga said. He said another person is in isolation, and the hospital has stopped accepting new emergency room patients.
"We knew a second case could be a reality, and we've been preparing for this possibility,'' said Dr. David Lakey, commissioner of the Texas Department of State Health Services. "We are broadening our team in Dallas and working with extreme diligence to prevent further spread.''
Dallas officials knocked on doors, made automated phone calls and passed out fliers to notify people within a four-block radius of the health care worker's apartment complex about the situation, though they said there was no reason for neighbors to be concerned.
Dallas police officers stood guard outside the complex Sunday and told people not to go inside. One said an industrial barrel outside contained hazardous waste taken from inside the building. Nearby residents periodically came out of their homes to ask about the commotion.
Kara Lutley, who lives a half-block from the complex, said she never received a call or other emergency notice and first heard about it on the news. She said the infected worker seemed to have taken all necessary precautions.
"I'm not overly concerned that I'll get Ebola,'' she said.
Officials said they also received information that there may be a pet in the health care worker's apartment, and they have a plan in place to care for the animal. They do not believe the pet has signs of having contracted Ebola.
Frieden on Sunday raised concerns about the possible breach of safety protocol and told CBS' "Face the Nation'' that among the things CDC will investigate is how the workers took off protective gear, because removing it incorrectly can lead to contamination. Investigators will also look at dialysis and intubation, procedures with the potential for spreading infectious material.
Health care workers treating Ebola patients are among the most vulnerable, even if wearing protective gear. A Spanish nurse assistant recently became the first health care worker infected outside West Africa during the ongoing outbreak. She helped care for a missionary priest who was brought to a Madrid hospital. More than 370 health care workers in west Africa have fallen ill or died in West Africa since epidemic began earlier this year.
Ebola spreads through close contact with a symptomatic person's bodily fluids, such as blood, sweat, vomit, feces, urine, saliva or semen. Those fluids must have an entry point, like a cut or scrape or someone touching the nose, mouth or eyes with contaminated hands, or being splashed. The World Health Organization says blood, feces and vomit are the most infectious fluids, while the virus is found in saliva mostly once patients are severely ill. The whole live virus has never been culled from sweat.
Duncan, the first person in the U.S. diagnosed with Ebola, came to Dallas to attend the high school graduation of his son, who was born in a refugee camp in Ivory Coast and brought to the U.S. as a toddler when his mother successfully applied for resettlement.
The trip was the culmination of decades of effort, friends and family members said. But when Duncan arrived in Dallas, though he showed no symptoms, he had already been exposed to Ebola. His neighbors in Liberia believe Duncan became infected when he helped a pregnant neighbor who later died from it. It was unclear if he knew about her diagnosis before traveling.
The revelation of the second Ebola case to be diagnosed in the U.S. came on the same weekend when new screenings went in effect at John F. Kennedy International Airport to help prevent the spread of the deadly virus.
On Saturday, a man who was about to be arrested on an outstanding warrant claimed he was feeling very ill after arriving on a flight at JFK, the New York Post reported.
The man had flown from his native Tanzania to Abu Dhabi, United Arab Emirates, and then on to New York, the newspaper reported.
Ebola Scare At JFK
He was put into a hazmat suit as a precaution because of the Ebola scare and was taken to Jamaica Hospital Medical Center for tests.
A passenger at Terminal 4 told 1010 WINS' Glenn Schuck that if the man was faking it to get out of arrest, he should be prosecuted for that offense as well.
"If he faked, then he's just being ridiculous," the woman said. "He needs to stop, and he's scaring the people around him."
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