COVID-19 primary infection, reinfection, and its associated clinical presentations

Introduction: SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus-2), which caused primary COVID-19 infection in millions worldwide, raised significant concerns as viral mutations emerged, leading to reinfections among previously infected and vaccinated individuals. This phenomenon became particularly evident during the second and third waves of the COVID-19 pandemic in India. Methods: The current study observed the rates of reinfections due to SARS-CoV-2 and their relation to vaccination details by retrospectively analyzing the data of patients who had reinfections during the second and third waves of COVID-19. Results: < 0.01). Conclusions: SARS-CoV-2 is re-emerging with new variants and varied presentations, posing a challenge to clinicians regarding specific diagnoses. The symptoms of COVID-19 during primary and re-infection did not differ greatly. Although vaccination protects individuals against reinfections, the exact duration of protection remains unknown and may necessitate booster doses at frequent intervals.