Symptoms appear anytime between 3 to 12 days after contracting the bacterium. Initial symptoms, similar to a common cold, are sneezing, runny nose, red watery eyes, nasal congestion, mild fever, chronic dry cough, loss of appetite, and overall unwell feeling. This progresses to severe coughing attacks and the expulsion of thick phlegm. A violent coughing attack may cause some people to vomit or turn blue in the face from being out of breath.