Introduction.Bullying among peers has immediate and long-term consequences, as it affects children's health-related quality of life. The aim was to examine the association between the frequency, type and dynamics of children's involvement in bullying situations and their academic performance over the school year. Methods. Longitudinal study conducted in 2015 in 9 to 12 year-olds in schools of Bahía Blanca, Argentina. Outcome measures: children's involvement in bullying situations, frequency of participation in bullying and academic performance. Bullying categories were obtained through the Preconceptions of Bullying and Intimidation Among Peers (PRECONCIMEI) questionnaire and academic performance as reflected by each child's school grades. Results. The survey included 375 children, of which 22.1% (83/375) were repeatedly involved and 30.12% (113/375) were occasionally involved in bullying situations (20.27% [76/375] reported having participated by the year end but not at the beginning, and 9.85% [37/375] showed the opposite behavior). No statistically significant differences were found, regardless of the course subject analyzed. Grades were found to have improved by school year-end, in all groups assessed. Conclusions. No association was found between bullying and academic performance.

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Presentación de casos clínicos RESUMENEn abril de 2020, en informes provenientes del Reino Unido se notificó una presentación en niños similar a la enfermedad de Kawasaki incompleta o al síndrome de choque tóxico asociados con la enfermedad por el nuevo coronavirus . Desde entonces, ha habido informes de niños afectados de manera similar en otras partes del mundo. En la actualidad, la afección se ha denominado síndrome inflamatorio multisistémico asociado a COVID-19 en niños (SIM-C). Por otra parte, se notificaron casos de pancreatitis aguda, en su mayoría en pacientes adultos, en el contexto de la infección aguda por el coronavirus 2 causante del síndrome respiratorio agudo grave (SARS-COV-2), causada por efectos citopáticos directos o respuestas celulares indirectas sistémicas inflamatorias e inmunomediadas. Sin embargo, son escasas las notificaciones en las que se describe el cuadro de pancreatitis aguda durante el SIM-C. Se describe aquí la presentación clínica, el tratamiento y la evolución de una paciente de 9 años que presentó un cuadro de pancreatitis aguda en el contexto del SIM-C.