Donald Trump has sparked the latest Twitter controversy criticising the return of two ebola-infected Americans to the US for treatment. 
 
 "Ebola patient will be brought to the U.S. in a few days - now I know for sure that our leaders are incompetent. KEEP THEM OUT OF HERE," he tweeted. 
 
 Two American aid workers, both seriously ill after being infected with the deadly ebola virus in Liberia, are being flown to the US and treated in isolation at an Atlanta hospital. 
 
 A medical plane carrying Dr Kent Brantly arrived on Saturday and missionary Nancy Writebol was brought back on Tuesday. 
 
 One of Mr Trump's tweets 
 
 Officials said bringing the two back would not put the American public at risk, but in his tweets Mr Trump disagreed. 
 
 He wrote: "The U.S. must immediately stop all flights from EBOLA infected countries or the plague will start and spread inside our 'borders.' Act fast!" 
 
 Mr Trump said people who go to "far away places to help out are great", but added they must "suffer the consequences" for their actions. 
 
 "Stop the EBOLA patients from entering the U.S. Treat them, at the highest level, over there. THE UNITED STATES HAS ENOUGH PROBLEMS!" Mr Trump tweeted. 
 
 Comedian Whoopi Goldberg branded the comments "dopey", "idiotic" and "stupid". 
 
 The comments drew criticism and sarcasm on Twitter. 
 
 "If you got sick in the service of your fellow man, you should be subject to the whims of Donald Trump. Seems only fair," said one user. ||||| As the worst Ebola outbreak in history unfolds in West Africa, The Post's Joel Achenbach explains how the deadly virus wreaks havoc on the human body. (Davin Coburn/The Washington Post) 
 
 A second American infected with the potentially deadly Ebola virus arrived at Emory University Hospital on Tuesday from Africa, following the first patient last weekend. Both were greeted by a team of highly trained physicians and nurses, a specialized isolation unit, extensive media coverage, and a storm of public reaction. People responded viscerally on social media, fearing that we risked spreading Ebola to the United States. 
 
 Those fears are unfounded and reflect a lack of knowledge about Ebola and our ability to safely manage and contain it. Emory University Hospital has a unit created specifically for these types of highly infectious patients, and our staff is thoroughly trained in infection control procedures and protocols. But beyond that, the public alarm overlooks the foundational mission of the U.S. medical system. The purpose of any hospital is to care for the ill and advance knowledge about human health. At Emory, our education, research, dedication and focus on quality — essentially everything we do — is in preparation to handle these types of cases. 
 
 Further, Americans stand to benefit from what we learn by treating these patients. (Bound by federal law, Emory cannot name the patients. The HIPAA Privacy Rule forbids health-care institutions from releasing identifiable health information.) Ebola won’t become a threat to the general public from their presence in our facility, but the insight we gain by caring for them will prepare us to better treat emergent diseases that may confront the United States in the future. We also can export our new knowledge to treat Ebola globally. This pathogen is part of our world, and if we want eradicate these types of potentially fatal diseases before they reach our shores uncontrolled, we have to contribute to the global research effort. Today, diseases do not stay contained to one city, country or even continent. 
 
 Most importantly, we are caring for these patients because it is the right thing to do. These Americans generously went to Africa on a humanitarian mission to help eradicate a disease that is especially deadly in countries without our health-care infrastructure. They deserve the same selflessness from us. To refuse to care for these professionals would raise enormous questions about the ethical foundation of our profession. They have a right to come home for their care when it can be done effectively and safely. 
 
 As health-care professionals, this is what we have trained for. People often ask why we would choose to care for such high-risk patients. For many of us, that is why we chose this occupation — to care for people in need. Every person involved in the treatment of these two patients volunteered for the assignment. At least two nurses canceled vacations to be a part of this team. They derive satisfaction from knowing that, after years of preparing for this type of case, they are able to help, to comfort and to do it safely. The gratitude they receive from the patients’ families drives their efforts. 
 
 As human beings, we all hope that if we were in need of superior health care, our country and its top doctors would help us get better. We can either let our actions be guided by misunderstandings, fear and self-interest, or we can lead by knowledge, science and compassion. We can fear, or we can care. 
 
 More from PostEverything: 
 
 Why do two white Americans get the Ebola serum while hundreds of Africans die? 
 
 My own infection is proof that someone can easily carry Ebola into the U.S. 
 
 I fed my newborns formula to keep them alive. Still, I felt guilty about it. 
 
 GALLERY: The struggle to curtail the Ebola outbreak
– As Emory University Hospital in Atlanta treats two patients with Ebola, health officials are taking flak for bringing the contagious disease to the US. The head nurse at Emory, however, thinks everybody should calm down. "Those fears are unfounded and reflect a lack of knowledge about Ebola and our ability to safely manage and contain it," writes Susan Grant in the Washington Post. But more than that, these critics seem to have forgotten the "foundational mission of the US medical system," she writes. Hospitals exist to care for the sick and to advance medical knowledge, and the Ebola cases hit both points, writes Grant. Should the US turn its back on two charity workers who selflessly helped others? To do so would be a breach of medical ethics. "We can either let our actions be guided by misunderstandings, fear, and self-interest, or we can lead by knowledge, science, and compassion," writes Grant. "We can fear, or we can care." Click to read her full column.