1st Ebola diagnosis in the United States Is there reason to worry

(CNN) For the first time a patient in an American hospital has been diagnosed with Ebola.

The unidentified man who is being treated at a Dallas hospital didn't show symptoms until after four or five days of arriving in the United States from Liberia.

Officials are being tight lipped about how he contracted the virus or how he's being treated citing privacy concerns.

But shortly after the news broke Tuesday evening more than 50 000 tweets about Ebola flew through Twitter in a one hour period many of them panicked responses.

Should we be concerned

The short answer no.

Now let's get to the long answer.

Could the patient's fellow passengers be infected

The patient being treated in Texas flew from one of the Ebola hot zones Liberia to Dallas.

But his fellow passengers aren't thought to be at risk because you can only contract Ebola through direct contact with the bodily fluids of someone who's actively sick with with it.

It's not like a cold or the flu which can be spread before symptoms show up. And it doesn't spread through the air.

It's very unlikely that (Ebola victims) would be able to spread the disease to fellow passengers said Stephen Monroe of the Centers for Disease Control and Prevention.

What's to stop other Ebola patients getting on a flight and coming here

The CDC has issued warnings to avoid nonessential travel to Liberia Sierra Leone and Guinea the countries grappling most with the outbreak.

And it's also working with airport officials in those nations and in Nigeria so every person getting on a plane is screened for fever.

And if they have a fever they are pulled out of the line assessed for Ebola and don't fly unless Ebola is ruled out CDC Director Dr. Thomas Frieden said.

CDC We will stop Ebola in its tracks

How do the airport authorities know what to look for

Those stricken with Ebola suffer ghastly symptoms including vomiting diarrhea muscle pain fever and unexplained bleeding.

That's part of the reason why the odds of getting Ebola from plane passengers is very low the International Air Transport Association said.

It is highly unlikely that someone suffering such symptoms would feel well enough to travel.

What's being done when the planes land in the U.S.

The United States isn't planning on banning flights coming from the hot zones in West Africa White House spokesman Josh Earnest said in August.

But once flights land at a U.S. airport from one of those countries passengers are screened once again.

And there are facilities available that if an individual is detected exhibiting these symptoms that they can be quarantined and promptly evaluated by a medical professional Earnest said.

Is Ebola coming to the U.S.

Are those procedures being followed

CNN Senior Medical Correspondent Elizabeth Cohen said when she and two colleagues recently returned from reporting in Liberia they got a mixed bag of responses from Customs and Border Protection officers.

We all said we were journalists who had just been in Liberia covering Ebola Cohen said. One of my colleagues was told 'Oh OK welcome back home sir' and (was) just let in that was it.

Cohen herself got a different response.

I was told 'Wait a minute I think I got an e mail about this ' and the border patrol officer went and consulted with his colleagues Cohen said.

That officer later told her she should check her system for 21 days.

I said 'What should I be checking ' And he wasn't sure Cohen said.

The third colleague merely had his boots checked to see if there was mud on them.

Three very different responses. They can't all be the way to do it Cohen said. I was surprised at how sort of chaotic it felt.

So how did Dallas patient slip through

The Ebola patient in Dallas didn't start showing symptoms until several days after he landed in the United States Frieden said.

Marie Nyan whose mother died of Ebola carries her 2 year old son Nathaniel Edward to an ambulance after showing signs of the virus in the Liberian village of Freeman Reserve on Tuesday September 30. Health officials say the Ebola outbreak in West Africa is the deadliest ever. More than 3 000 people have died according to the World Health Organization. A health official uses a thermometer Monday September 29 to screen a Ukrainian crew member on the deck of a cargo ship at the Apapa port in Lagos Nigeria. Children pray during Sunday service at the Bridgeway Baptist Church in Monrovia Liberia on Sunday September 28. Residents of the St. Paul Bridge neighborhood in Monrovia take a man suspected of having Ebola to a clinic on September 28. Workers move a building into place as part of a new Ebola treatment center in Monrovia on September 28. Medical staff members at the Doctors Without Borders facility in Monrovia burn clothes belonging to Ebola patients on Saturday September 27. A police officer patrols a road in Monrovia on September 27 after a body was found in the center of the city. Tents are set up as health control centers at an air base near the Senegalese capital of Dakar on September 27. After closing its borders on August 21 Senegal opened an air corridor to allow humanitarian aid to be delivered to the three areas most affected by the Ebola virus. A health worker in Freetown Sierra Leone sprays disinfectant around the area where a man sits before loading him into an ambulance on Wednesday September 24. People wait outside a new Ebola treatment center in Monrovia on Tuesday September 23. Health workers in protective suits work outside an Ebola treatment center in Monrovia on September 23. Medics load an Ebola patient onto a plane at Sierra Leone's Freetown Lungi International Airport on Monday September 22. A team that handles the management of dead bodies prays with Saymon Kamara far right on September 22 in Monrovia. Kamara's mother died from complications of high blood pressure. A few people are seen in Freetown during a three day nationwide lockdown on Sunday September 21. In an attempt to curb the spread of the Ebola virus people in Sierra Leone were told to stay in their homes. A baby pig sleeps in front of an ambulance at the Connaught Hospital in Freetown on September 21. Supplies wait to be loaded onto an aircraft at New York's John F. Kennedy International Airport on Saturday September 20. It was the largest single shipment of aid to the Ebola zone to date and it was coordinated by the Clinton Global Initiative and other U.S. aid organizations. A volunteer health worker in Freetown talks with residents on how to prevent Ebola infection and identify symptoms of the virus on September 20. Bars of soap were also distributed. Police in Freetown guard a roadblock Friday September 19 as the country began enforcing its three day nationwide lockdown. A student of the Sainte Therese school in Abidjan Ivory Coast looks at placards Monday September 15 that were put up to raise awareness about the symptoms of the Ebola virus. Members of a volunteer medical team wear protective gear before the burying of an Ebola victim Saturday September 13 in Conakry Guinea. A child stops on a Monrovia street Friday September 12 to look at a man who is suspected of suffering from Ebola. Health workers on Wednesday September 10 carry the body of a woman who they suspect died from the Ebola virus in Monrovia. A woman in Monrovia carries the belongings of her husband who died after he was infected by the Ebola virus. Five ambulances that were donated by the United States to help combat the Ebola virus are lined up in Freetown on September 10 following a ceremony that was attended by Sierra Leone President Ernest Bai Koroma. A health worker wears protective gear Sunday September 7 at ELWA Hospital in Monrovia. An ambulance transporting Dr. Rick Sacra an American missionary who was infected with Ebola in Liberia arrives at the Nebraska Medical Center in Omaha Nebraska on Friday September 5. Sacra was being treated in the hospital's special isolation unit. Medical workers from the Liberian Red Cross carry the body of an Ebola victim Thursday September 4 in Banjol Liberia. Health workers in Monrovia place a corpse into a body bag on September 4. A rally against the Ebola virus is held in Abidjan on September 4. After an Ebola case was confirmed in Senegal people load cars with household items as they prepare to cross into Guinea from the border town of Diaobe Senegal on Wednesday September 3. Crowds cheer and celebrate in the streets Saturday August 30 after Liberian authorities reopened the West Point slum in Monrovia. The military had been enforcing a quarantine on West Point fearing a spread of the Ebola virus. A health worker wearing a protective suit conducts an Ebola prevention drill at the port in Monrovia on Friday August 29. Senegalese Health Minister Awa Marie Coll Seck gives a news conference August 29 to confirm the first case of Ebola in Senegal. She announced that a young Guinean had tested positive for the deadly virus. Volunteers working with the bodies of Ebola victims in Kenema Sierra Leone sterilize their uniforms on Sunday August 24. A Liberian health worker checks people for symptoms of Ebola at a checkpoint near the international airport in Dolo Town Liberia on August 24. A guard stands at a checkpoint Saturday August 23 between the quarantined cities of Kenema and Kailahun in Sierra Leone. A burial team from the Liberian Ministry of Health unloads bodies of Ebola victims onto a funeral pyre at a crematorium in Marshall Liberia on Friday August 22. A humanitarian group worker right throws water in a small bag to West Point residents behind the fence of a holding area on August 22. Residents of the quarantined Monrovia slum were waiting for a second consignment of food from the Liberian government. Dr. Kent Brantly leaves Emory University Hospital on Thursday August 21 after being declared no longer infectious from the Ebola virus. Brantly was one of two American missionaries brought to Emory for treatment of the deadly virus. Brantly right hugs a member of the Emory University Hospital staff after being released from treatment in Atlanta. Family members of West Point district commissioner Miata Flowers flee the slum in Monrovia while being escorted by the Ebola Task Force on Wednesday August 20. An Ebola Task Force soldier beats a local resident while enforcing a quarantine on the West Point slum on August 20. Local residents gather around a very sick Saah Exco 10 in a back alley of the West Point slum on Tuesday August 19. The boy was one of the patients that was pulled out of a holding center for suspected Ebola patients after the facility was overrun and closed by a mob on August 16. A local clinic then refused to treat Saah according to residents because of the danger of infection. Although he was never tested for Ebola Saah's mother and brother died in the holding center. A burial team wearing protective clothing retrieves the body of a 60 year old Ebola victim from his home near Monrovia on Sunday August 17. lija Siafa 6 stands in the rain with his 10 year old sister Josephine while waiting outside Doctors Without Borders' Ebola treatment center in Monrovia on August 17. The newly built facility will initially have 120 beds making it the largest ever facility for Ebola treatment and isolation. Brett Adamson a staff member from Doctors Without Borders hands out water to sick Liberians hoping to enter the new Ebola treatment center on August 17. Workers prepare the new Ebola treatment center on August 17. A body reportedly a victim of Ebola lies on a street corner in Monrovia on Saturday August 16. Liberian police depart after firing shots in the air while trying to protect an Ebola burial team in the West Point slum of Monrovia on August 16. A crowd of several hundred local residents reportedly drove away the burial team and their police escort. The mob then forced open an Ebola isolation ward and took patients out saying the Ebola epidemic is a hoax. A crowd enters the grounds of an Ebola isolation center in the West Point slum on August 16. The mob was reportedly shouting No Ebola in West Point. A health worker disinfects a corpse after a man died in a classroom being used as an Ebola isolation ward Friday August 15 in Monrovia. A boy tries to prepare his father before they are taken to an Ebola isolation ward August 15 in Monrovia. Kenyan health officials take passengers' temperature as they arrive at the Jomo Kenyatta International Airport on Thursday August 14 in Nairobi Kenya. A hearse carries the coffin of Spanish priest Miguel Pajares after he died at a Madrid hospital on Tuesday August 12. Pajares 75 contracted Ebola while he was working as a missionary in Liberia. A member of the Centers for Disease Control and Prevention leads a training session on Ebola infection control Monday August 11 in Lagos. Health workers in Kenema screen people for the Ebola virus on Saturday August 9 before they enter the Kenema Government Hospital. A health worker at the Kenema Government Hospital carries equipment used to decontaminate clothing and equipment on August 9. Health care workers wear protective gear at the Kenema Government Hospital on August 9. Paramedics in protective suits move Pajares the infected Spanish priest at Carlos III Hospital in Madrid on Thursday August 7. He died five days later. Nurses carry the body of an Ebola victim from a house outside Monrovia on Wednesday August 6. A Nigerian health official wears protective gear August 6 at Murtala Muhammed International Airport in Lagos. Officials with the Centers for Disease Control and Prevention in Atlanta sit in on a conference call about Ebola with CDC team members deployed in West Africa on Tuesday August 5. Aid worker Nancy Writebol wearing a protective suit gets wheeled on a gurney into Emory University Hospital in Atlanta on August 5. A medical plane flew Writebol from Liberia to the United States after she and her colleague Dr. Kent Brantly were infected with the Ebola virus in the West African country. Nigerian health officials are on hand to screen passengers at Murtala Muhammed International Airport on Monday August 4. A man gets sprayed with disinfectant Sunday August 3 in Monrovia. Dr. Kent Brantly right gets out of an ambulance after arriving at Emory University Hospital in Atlanta on Saturday August 2. Brantly was infected with the Ebola virus in Africa but he was brought back to the United States for further treatment. Nurses wearing protective clothing are sprayed with disinfectant Friday August 1 in Monrovia after they prepared the bodies of Ebola victims for burial. A nurse disinfects the waiting area at the ELWA Hospital in Monrovia on Monday July 28. Liberian President Ellen Johnson Sirleaf right walks past an Ebola awareness poster in downtown Monrovia as Liberia marked the 167th anniversary of its independence Saturday July 26. The Liberian government dedicated the anniversary to fighting the deadly disease. In this photo provided by Samaritan's Purse Dr. Kent Brantly left treats an Ebola patient in Monrovia. On July 26 the North Carolina based group said Brantly tested positive for the disease. Days later Brantly arrived in Georgia to be treated at an Atlanta hospital becoming the first Ebola patient to knowingly be treated in the United States. A 10 year old boy whose mother was killed by the Ebola virus walks with a doctor from the aid organization Samaritan's Purse after being taken out of quarantine Thursday July 24 in Monrovia. A doctor puts on protective gear at the treatment center in Kailahun on Sunday July 20. Members of Doctors Without Borders adjust tents in the isolation area in Kailahun on July 20. Boots dry in the Ebola treatment center in Kailahun on July 20. Red Cross volunteers prepare to enter a house where an Ebola victim died in Pendembu Sierra Leone on Friday July 18. Dr. Jose Rovira of the World Health Organization takes a swab from a suspected Ebola victim in Pendembu on July 18. Red Cross volunteers disinfect each other with chlorine after removing the body of an Ebola victim from a house in Pendembu on July 18. A dressing assistant prepares a Doctors Without Borders member before entering an isolation ward Thursday July 17 in Kailahun. A doctor works in the field laboratory at the Ebola treatment center in Kailahun on July 17. Doctors Without Borders staff prepare to enter the isolation ward at an Ebola treatment center in Kailahun on July 17. A health worker with disinfectant spray walks down a street outside the government hospital in Kenema on Thursday July 10. Dr. Mohamed Vandi of the Kenema Government Hospital trains community volunteers who will aim to educate people about Ebola in Sierra Leone. Police block a road outside Kenema to stop motorists for a body temperature check on Wednesday July 9. A woman has her temperature taken at a screening checkpoint on the road out of Kenema on July 9. A member of Doctors Without Borders puts on protective gear at the isolation ward of the Donka Hospital in Conakry on Saturday June 28. Airport employees check passengers in Conakry before they leave the country on Thursday April 10. CNN's Dr. Sanjay Gupta left works in the World Health Organization's mobile lab in Conakry. Gupta traveled to Guinea in April to report on the deadly virus. A Guinea Bissau customs official watches arrivals from Conakry on Tuesday April 8. Egidia Almeida a nurse in Guinea Bissau scans a Guinean citizen coming from Conakry on April 8. A scientist separates blood cells from plasma cells to isolate any Ebola RNA and test for the virus Thursday April 3 at the European Mobile Laboratory in Gueckedou Guinea. Members of Doctors Without Borders carry a dead body in Gueckedou on Friday April 1. Gloves and boots used by medical personnel dry in the sun April 1 outside a center for Ebola victims in Gueckedou. A health specialist works Monday March 31 in a tent laboratory set up at a Doctors Without Borders facility in southern Guinea. Health specialists work March 31 at an isolation ward for patients at the facility in southern Guinea. Workers associated with Doctors Without Borders prepare isolation and treatment areas Friday March 28 in Guinea. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 Photos Ebola outbreak in West Africa

Isn't he putting others at risk

The paramedics who took the patient to the hospital have been isolated the chief of staff for Dallas Mayor Mike Rawlings told CNN. None have shown symptoms of the disease so far.

The ambulance that carried the patient ambulance 37 was in use for two days after the transport but was adequately decontaminated said Dallas city spokeswoman Sana Syed.

Frieden said the patient himself had a handful of contacts with people after showing symptoms but before he was isolated a period of about four days.

A CDC team was headed to Texas to help investigate those contacts.

It is certainly possible that someone who had contact with this individual could develop Ebola in the coming weeks Frieden said. But there is no doubt in my mind that we will stop it here.

How is this not concerning

Although there's no vaccine and no cure the one real advantage we have with Ebola is that doctors know how to control it.

Ebola isn't some mystical pathogen (with) some bizarre mode of transmission said Bruce Ribner director of Emory University Hospital's Infectious Disease Unit

And we have the resources to contain it.

CNN reporter talks about covering Ebola

How are we so confident

For starters the United States has the luxury of better health care compared to Liberia Sierra Leone and Guinea.

The U.S. has facilities that can do the kind of isolation that apparently is very difficult to do within the health care infrastructure in the African countries that we are talking about said Dr. Anthony Fauci of the National Institutes of Health.

Secondly remember Kent Brantly and Nancy Writebol The doctor and the American missionary were infected in Liberia brought to Atlanta's Emory University Hospital placed in isolation units treated and discharged.

They were the first humans with Ebola to ever arrive in the United States. And they are fine.

CNN's Jen Christensen Madison Park Ben Brumfield and Dana Ford contributed to this report.

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