the comparison of susceptibility to sars-cov-2 infection between pediatric and adults

Sars-cov-2 causes coronavirus disease 2019 (covid-19) and is responsible for the recent pandemic in the world. it has been recently recognized as a challenge for public health and a significant cause of severe illness in all age groups. young children and older people are susceptible to sarscov2 infection. however, children usually present mild symptoms compared to adult patients. the relationship between age, severity, and covid-19 transmission is compared to determine whether there is any reasonable relationship between age and covid-19. it should be mentioned that some risk factors may increase the probability of developing severe covid-19 by advancing age, such as pathophysiological changes in the respiratory system, angiotensin-converting enzyme 2 expression in the nasopharynx, and smoking. susceptibility to sars-cov-2 infection is independent of age, but the mortality rate of covid-19 depends on age.