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The cough and upper respiratory symptoms are most concerning because it is my understanding that the current H5N1 strain binds to receptors that are located in the eyes of humans, not the respiratory tract. If it has indeed mutated to cause respiratory symptoms in humans then it is more likely to spread from person to person. Of course, people can and do get infected with more than one thing at a time, so hopefully that is not the case.Third person infected in U.S. bird flu outbreak — but with new symptoms
The patient has had a cough and congestion, the first case of respiratory illness associated with bird flu in people in the U.S.. There's still no sign the virus is spreading from person to person.www.nbcnews.com