Search for: [Abstract = "ristics showed a slight prevalence of boys in all five waves. Significant differences in the age of patients were found between the following pandemic waves. The median age was the highest in the first wave \(95.8 months\) and significantly lower in others, decreasing in the following waves \(it was 14.6 months in the fifth wave\). Severe courses of the disease were rare, and there were no significant differences in severity between the five waves, although we did observe increased hospitalizations in the fourth and fifth waves. The comorbidities were similar. The basic differences in the clinical presentation were the frequency of respiratory symptoms \(rhinitis, cough, dyspnea, auscultatory changes, and lower respiratory infection diagnosed by imaging\), which increased from the second to the fourth waves. In contrast, gastrointestinal symptoms \(vomiting and diarrhea\) were the most common in the second wave. More neurological symptoms occurred in the fourth wave. Regarding the final diagnoses of the hospitalized COVID\-19 pediatric patients, the number of children with upper respiratory or gastroenterological symptoms was the highest in the fifth wave, while that of lower respiratory infection was most common in the first wave. We observed more upper than lower respiratory infections and shorter lengths of stay in the hospital in the fifth wave. Sta"]

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