A 1 year old boy presents with a high fever for 3 days. On the day of admission, he developed noisy breathing, while his eyelids appeared swollen. He has also been feeding poorly. His birth and medical histories are unremarkable. All immunizations (including diphtheria) are up to date. A urinalysis is found to be normal.
Hb: 11.8 g/dL Hct: 33.1% WBC: 18,900/mm3 N: 33% - Band:1% L: 41% Platelets 221,000/mm3 Blood film: A significant number of atypical lymphocytes are seen (21%)
The rapid step test (RST) is negative. The culture reports will be available in 3 days.
The monospot test is negative.
Serology is positive for viral capsid antigen IgM