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Muhammad Kashif Munir, Sana Rehman, Ayesha Aftab, Muhammad Amer Nazir, Akhtar Ali, Naeem Asghar 2023. Impact of Vaccination on Symptomatology among COVID-19 Infection and Re-infection. Pakistan Journal of Medical & Health Sciences. 16, 12 (Jan. 2023), 93. DOI:https://doi.org/10.53350/pjmhs2022161293.