Previous research into whether or not antibiotics are beneficial in the treatment of chest infections, where symptoms include shortness of breath, weakness, high fever, coughing and fatigue, have produced conflicting results- particularly in older people where chest infections can lead to further complications.

BBC: Antibiotics 'ineffective for coughs'

"However, if the individual is experiencing fever and fatigue, and has a history of potential rural rodent exposure, together with shortness of breath, (that) would be strongly suggestive of HPS, " the CDC says.

CNN: STORY HIGHLIGHTS