DOI: 10.1373/clinchem.2010.158584


In April 1997, a then 4-year-old boy suddenly fell ill with fever, cough, fatigue, and poor physical resistance to stress. Marked cyanosis of the lips and the nail beds was noted. During his 3-week hospital stay, mycoplasmosis of the lung and a respiratory syncytial virus infection were diagnosed by the detection of high-titer Mycoplasma agglutinins in serum samples and positive test results for the presence of respiratory syncytial virus in nasopharyngeal secretions. In addition, incipient exogenous allergic alveolitis was suspected because of the presence of budgerigars and cockatiels in the boy's home and the finding of serum positivity for IgG precipitin.