| The infection May last for 6 weeks, although some residual coughing may occur for months afterwards in some cases. The Signs and symptoms can be divided into three stages as follows;
Catarrhal Stage: Characterized by cold-like symptoms. Lack of appetite, runny nose, lethargy, and a hacking cough, especially at night. This is the most infectious stage and lasts 7-10 days.
Paroxysmal Stage: As suggested by the name, this stage is characterized by paroxysmal coughing. The infected person has several rapid coughs followed by an inspiratory whoop, and this may be repeated until the person vomits. Occasionally They may loose consciousness. During these uncontrollable coughing attacks the person will become red in the face, often followed by a bluish tinge as they are deprived of oxygen. In between episodes the individual seems fine. The coughing spasms may be brought on by exercise or laughing. This stage usually lasts 10-14 days but can last longer.
Convalescent Stage: During this stage, the coughing paroxysms become less severe and less frequent. This stage can last 2-4 weeks, although some coughing may remain for months. |