الفهرس 
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Abstract
The COVID-19 pandemic was a public health emergency. The development of COVID-19 vaccinations provided hope for an end to the pandemic, if there was equal access and optimal uptake in all countries around the world.
The aim of our study is to assess the prevalence of COVID-19 infection after vaccination, evaluate the severity of infection after vaccination and predict possible risk factors for this condition.
A total of 369 participants who received authorized COVID-19 vaccination were enrolled in the current study and subdivided into two groups:
group A: people received vaccination at the study period and were followed by phone calls or email for any new infection.
group B: patients who were confirmed to have recent COVID-19 infection that visit outpatient clinic or admit to ward or ICU of Assiut University hospital at study period.
All patients who confirmed positive for COVID-19 were subjected to the following: full medical history, examination and investigations including PCR, HRCT and other inflammatory markers.
Out of participants, 70 (19%) patients developed post-vaccine COVID-19 infection
The mean age of patients with post-vaccine COVID-19 infection was significantly higher in comparison to those who didn’t develop infection (37.17 ± 17.97 vs. 27.66 ± 12.29 (years); p< 0.001).