A man has been spotted helping a nurse in the US with ebola board a flight to a specialist unit - without wearing any protective equipment.
The man, who is carrying a clipboard, comes within feet of Amber Vinson, who is now being treated in isolation in Atlanta, Georgia.
He is seen handling items given to him by a person wearing protective clothing.
Ebola is contracted through contact with an infected person's bodily fluids, and it is not airborne.
But this incident is the latest to raise questions about the US response to the outbreak, which has killed more than 4,000 people in West Africa.
Other mistakes include:
:: Allowing Ms Vinson to travel on a commercial plane from Cleveland, Ohio, to Dallas, Texas, even though she was showing the early symptoms of ebola.
The nurse did tell officials she was running a temperature, and now the Centers for Disease Control and Prevention (CDC) is trying to track down 132 other passengers on that plane.
:: Another nurse who contracted ebola did so after an "unspecified breach of protocol". Nina Pham, 26, had been wearing full protective gear when she was treating Thomas Eric Duncan, who died after catching ebola in Liberia.
:: Healthcare workers have inadvertently violated protocols by wearing too many protective layers, according to CDC director Thomas Frieden.
:: Mr Duncan was sent home from Texas Health Presbyterian Hospital, despite telling medical staff he had come from the West African nation.
:: Workers were seen not wearing any protective clothing while they cleaned the outside of his Dallas apartment.
:: A nursing union has alleged a litany of errors in the treatment of Mr Duncan, claiming that he was kept in a non-isolated area of the emergency department for several hours and that nurses treating him were also taking care of other patients.
However, one notable success in the fight against ebola involves Nigeria and Senegal, two countries where the outbreak has been largely contained.
Nigeria had eight deaths but brought its outbreak under control by tracking 894 people who had been in contact with a man who brought the virus from Liberia, and visiting 18,500 more people to check for symptoms. Here are seven things Nigeria did right:
:: Training
Nigeria's Public Health Department sent dozens of doctors on an ebola training course. Hundreds of private clinics have been trained in identifying symptoms.
:: Communication
The first known case was a man exposed in Liberia, who despite medical advice travelled on a commercial aircraft from Monrovia to Togo, via Ghana, then changed aircraft and flew to Lagos. He died on 25 July.
Port Health Services conducted early contact tracing at the airport, and worked with airlines to ensure proper notification of the outbreak.
:: Early tracing
Suspected cases were isolated at ebola treatment facilities, initially in Lagos and subsequently in Port Harcourt. A contact tracing team, staffed by dedicated epidemiologists, was established to investigate all primary contacts and alert the case management team to anyone showing symptoms.
:: Response
Nigeria's Federal Ministry of Health activated an Ebola Incident Management Centre (a precursor to the Emergency Operations Centre) on 23 July, to rapidly respond to the Ebola outbreak.
The US Centres for Disease Control and Prevention (CDC) credit this response with helping to contain the outbreak.
:: Mobile phones
An emergency presidential decree enabled officials to access mobile phone records and empowered them to lean on law enforcement agencies where necessary to track down people at risk.
:: Awareness
Nigeria Health Watch set up EbolaFacts.com within 24 hours of the first confirmed case. The site received 600,000 hits and 850,000 Facebook views within a week.
:: Government support
President Goodluck Jonathan declared a national emergency, and approved a 1.9bn naira (£7.2m) fund to help fight the outbreak.
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