Ottawa – The majority of M. pneumoniae infections in adults are asymptomatic, but M. pneumoniae is the cause of many upper respiratory tract infections (up to 50% of cases). Symptoms develop over several days and persist for weeks to months, with common symptoms including sore throat, hoarseness, fever, cough (may be purulent), headaches, coryza, earache, myalgias, chills, and general malaise. There may also …