Man, 25, With Sinus Pain, Sore Throat, and Rash

CONCLUSION

The diagnosis of EBV can be challenging due to its similarity to group A streptococcal pharyngitis and other viral syndromes. In this case, the development of classic symptoms, along with the morbilliform eruption following administration of an aminopen­icillin, was strongly suggestive of this diagnosis. This pairing of EBV infection and aminopenicillin rash does not indicate a penicillin allergy.