Abstract
INTRODUCTION: The present case describes one of the few reported occurrences of coinfection by EBV and SARS-CoV-2, initially treated as streptococcal pharyngitis. CASE DESCRIPTION: An 18-year-old female was admitted with whitish plaques in the throat associated with pain, cough, hoarseness, asthenia, tonsillar exudate, hypertrophy, hyperemia, and adenomegaly on the cervical region. Based on suspicion of bacterial tonsillitis, the patient was already taking amoxicillin with clavulanate. A rapid test was negative for group A streptococci. Laboratory exams revealed elevated counts of Anti-VCA IgM and Anti-VCA IgG for EBV. The cytomegalovirus (IgM and IgG) result was negative, and the blood count was within normal limits. However, a COVID-19 infection was confirmed by qPCR. The management was supportive treatment for symptom relief and isolation for 14 days. The patient remained afebrile and clinically stable during this period, with saturation ranging from 98% to 100%. However, the patient evolved with anosmia and ageusia. Then, olfaction training therapy was initiated, as well as continuing asthenia. Five days later, she presented petechiae on the chest and upper limbs, associated with mild pruritus. CONCLUSION: Epstein-Barr mononucleosis and COVID-19 are similar in some aspects, and their viruses may be associated with a coinfection, which could make the diagnoses difficult and aggravate the clinical condition. In addition, it is essential to emphasize the importance of laboratory tests to avoid erroneous treatments that may worsen the patient's condition and change his prognosis.