Atypical High-Burden Breakthrough Varicella: A Diagnostic Pitfall in the Two-Dose Vaccine Era

We present the case of a seven-year-old fully immunized male who developed an intensely pruritic, generalized maculopapular rash that progressed to vesicles. The patient’s rash was initially diagnosed by his primary care provider as possible scabies and treated with topical permethrin. Our examination revealed a diffuse maculopapular and vesicular exanthem with lesions at various stages of evolution, eventually progressing to secondary cellulitis. The patient’s presentation, consistent with varicella (chickenpox), highlights the diagnostic challenges of breakthrough varicella infection and potential complications in fully vaccinated children. Thus, we highlight the importance of having a high clinical index of suspicion for varicella, even in fully immunized children.