RTIs (respiratory tract infections) are infections of the sinuses, throat, airways, or lungs, which are all involved in breathing. It can be classified as upper respiratory tract infection and lower respiratory tract infection. Lower respiratory tract infections include acute bronchitis, bronchiolitis, pneumonia, severe acute respiratory syndrome, tuberculosis. Respiratory tract infections are one of the most prevalent reasons for individuals to contact their doctor, general practitioner, or pharmacy. It is necessary to estimate the burden of severe LRTI due to waning immunity in order to calculate the advantages of many immunizations on this crucial public health issue.

Keywords : Lower Respiratory Tract Infection, Pediatrics, Antibiotics, Tuberculosis, Pneumonia.