Emerging immunological challenges in post-COVID individuals: insights from a case series and review

The Coronavirus Disease 2019 (COVID-19) pandemic has unveiled diverse immunological complications extending beyond the acute phase of infection. We present a case series of four patients who developed autoimmune vasculitis and sarcoidosis post-recovery from COVID-19. Case presentations include recurrent fever and respiratory symptoms in a 36-year-old female, granulomatous liver lesions in a 63-year-old male, progressive dyspnea in a 44-year-old female, and diffuse alveolar hemorrhage in a 74-year-old female following severe pneumonia. These cases underscore the importance of vigilance for immunological sequelae in post-COVID-19 patients, particularly those with predisposing comorbidities. We tried to elucidate pathophysiological mechanisms and optimize management strategies for these rare but clinically significant manifestations.