We aimed to find out whether the tonsils and nasal tissues of pediatric patients are the main factors that protects the children's immune system against COVID-19 infection.

Since it is known that the tonsil and adenoid tissues that are known as a secondary lymphoid organ, which form the first line of defense, are more active in childhood than adults, especially in the childhood age group, and since it has been scientifically shown that patients diagnosed with COVID-19 infection in the pediatric age group overcome this disease lightly than adults, we aimed to reveal whether the defined tonsil and adenoid tissues are the main factors that protect the children's immune system against COVID-19 infection.

Inclusion Criteria:

• Patients with COVID-19 infection.
• Patients aged between 1-16 years
• Patients whose PCR test becomes negative

Exclusion Criteria:

• Patients with lymphoid tissue malignant disease
• Patients with known lung disease
• Patients with known systemic disease

Pediatric patients between the ages of 1-16 diagnosed with Covid-19 will be examined by the ENT doctor in terms of tonsil and adenoid tissues after they overcome the active infection period and PCR tests turn negative.

We plan to share our study data after completing collecting patient data and preparing the article about the study.