*  Median, ** Range, NS: Not stated
For instance, Hanna et al. reported a study of 2 pediatric patients with IgAN presenting with microscopic hematuria less than 24 hrs after receiving the BioNTech-Pfizer vaccine. The authors found a 13-year-old male patient had a history of IgAN and type 1 diabetes, whereas the other male patient in this study was found healthy with no medical history before receiving the vaccine (28). Children and adolescents’ clinical cardiac symptoms are also demonstrated in Table 3. It included the abnormal EKG and echocardiogram, abnormal cardiac MRI findings including pericardial effusion, and high troponin levels. It is worth noting that troponin levels were elevated in 35% of patients (23, 25-27). However, no testing showed pericardial effusion. The most common EKG result was ST elevation. Marshall et al. reported atrioventricular dissociation with junctional escape rhythm, T-wave abnormality, and sinus bradycardia(23). Moreover, Tano et al. found in their study that among patients who had EKG,  2 had RP depression, 1 had abnormal waves, and 1 had ST depression and conduction delay(25). The abnormal echocardiogram outcomes were included in 3 studies (23, 26, 27). For instance, Marshall et al. reported in their study that only one patient had mildly depressed RV and LV systolic function (LVEF 47%) and basal lateral and posterior strain (23). Ejection fraction was reported by Schauer et al. (26) and Tano et al. (25) for 13 and 8 patients, respectively. Moeller et al. reported the psychological symptoms of children and adolescents after having the BioNTech-Pfizer vaccine(24). Their study included 33 pediatric patients, 3 of them had anxiety, 3 had attention deficit or hyperactivity, 4 had disruptive mood dysregulation disorder, and 18 of them had a major depressive disorder or suicidal ideation.
Table 3. Clinical Signs and Symptoms on Children and Adolescents After BioNTech-Pfizer COVID-19 Vaccine