Infección por el nuevo coronavirus 2019 en niños

RESUMEN La enfermedad del coronavirus 2019 (COVID-19) es poco frecuente en niños y su salud se ve poco comprometida en la mayoría de casos. La presentación clínica más común es tos, fiebre y eritema faríngeo, los casos graves suelen presentarse con taquipnea. El curso de la enfermedad es de una a dos semanas. Los hallazgos de laboratorio son inespecíficos, entre ellos, linfopenia, elevación de la proteína C reactiva y la procalcitonina. En fases iniciales, la radiografía torácica es usualmente normal, y los hallazgos tomográficos más comunes son consolidaciones con signo del halo, vidrio esmerilado y nódulos pequeños, que afectan principalmente las zonas subpleurales. El manejo es sintomático y, en los casos graves, debe estar enfocado a brindar soporte respiratorio. Se recomienda que la manipulación de las secreciones respiratorias sea limitada y que se tengan las mismas precauciones para evitar contaminación que en pacientes adultos.

ABSTRACT COVID-19 is rarely reported in children and they are mildly affected in most cases. The most common clinical presentation of COVID-19 is cough, fever and sore throat; severe cases show tachypnea. The course of the disease is from one to two weeks. Laboratory findings are nonspecific; lymphopenia, elevation of C-reactive protein and procalcitonin have been described. Early chest X-ray is usually normal, and the most common tomographic findings are consolidations with halo, ground-glass opacities and tiny nodules which mainly affects subpleural areas. Management of the disease is supportive; in severe cases, it should be focused on respiratory support. It is recommended to limit the handling of respiratory secretions and to follow the same preventive measures provided to adults.

Rinovirus: Frecuencia en niños con infección respiratoria aguda, no internados / Rhinoviruses: Frequency in nonhospitalized children with acute respiratory infection

Los métodos moleculares para diagnosticar rinovirus humanos (RVH) han aumentado la sensibilidad de detección. Esto ha permitido documentar la asociación entre los RVH y las infecciones respiratorias agudas (IRA) altas y bajas. La infección por RVH durante la infancia se asoció con posterior desarrollo de asma. Se estudió la frecuencia de RVH en 186 niños menores de 6 años ambulatorios con IRA (alta o baja), durante 2 años consecutivos (1/6/2008 - 31/5/2010). Se correlacionó la presencia de RVH con los antecedentes y características clínico-epidemiológicas. La detección de RVH se realizó con una RT-PCR en tiempo real que amplifica parte de la región 5' no codificante del genoma. Los virus respiratorios clásicos se estudiaron por inmunofluorescencia. En el 61% de los niños se detectó etiología viral. Las frecuencias fueron: RVH 27%, virus sincicial respiratorio (VSR) 16%, influenza A y B 9%, parainfluenza 8%, metapneumovirus 7% y adenovirus 0.5%. Se observaron coinfecciones duales en 8 casos, siendo RVH el más frecuente (en 4 de ellos). Los RVH circularon durante todo el período estudiado, con picos en invierno y primavera. No se observaron diferencias clínico-epidemiológicas significativas entre pacientes con o sin RVH, excepto un mayor porcentaje de niños afebriles con RVH. Los RVH fueron los virus más detectados en niños ambulatorios, principalmente en menores de 2 años, los segundos virus asociados a bronquiolitis, luego del VSR, y detectados tres veces más en los niños expuestos a tabaquismo pasivo (OR: 2,91; p = 0.012) que en el resto. Fueron identificados como único agente en el 28% de las bronquiolitis.

Molecular methods for human rhinoviruses (HRV) have increased the sensitivity in their diagnosis. HRV may cause acute respiratory infections (ARI) of the upper and lower respiratory tract. HRV infection during childhood is a predictor of asthma development. In this study, the HRV frequency in outpatient children with ARI was determined, and their clinical features and previous conditions were evaluated. A total of 186 respiratory samples of children under 6 year old attending the CEMIC pediatric emergency room from June 1, 2008 to May 31, 2010, were studied. Classical respiratory viruses were detected by immunofluorescence. A real time RT-PCR that amplifies part of the 5' non coding genomic region was used for HRV detection. Viral detection was obtained in 61% of children. The frequency was: 27% for HRV, 16% for respiratory syncytial virus (RSV), 9% for influenza, 8% for parainfluenza, 7% for metapneumovirus and 0.5% for adenovirus. Dual coinfection was detected in 8 children and HRV were the most frequent, detected in 4 of them. HRV circulated during the two year period of the study, with peaks during winter and spring. No clinical difference was observed between patients with or without HRV, except an increase percent of children with HRV without fever. HRV were the most frequent viruses detected in this population, mainly in children under 2 year old, the second cause of bronchiolitis after RSV and more frequently detected in children exposed to passive smoking (OR = 2.91; p = 0.012), and were detected as the sole etiologic agent in 28% of bronchiolitis.

Role of Epstein Barr virus [EBV] in chronic fatigue syndrome associated with tonsillitis and pharyngitis

To assess the possible role of [EBV] in patients with chronic tonsillitis and pharyngitis, complaining of chronic fatigue syndrome [CFS], we studied 42 of these cases, 38 normal controls, and 37 cases with tonsillitis and pharyngitis but without [CFS] symptoms. Anti [EBV] Ig[G] and anticytomegalovirus [CMV] Ig[M] and Ig[G] were evaluated by an ELISA technique. Ig[M] anti [EBV] was positive in 11.9% and Ig[G] in 57.1% of cases. Ig[G] anti [CMV] was present in only 7.1% of cases. These results were significantly higher than values encountered in controls and may point to the possible role of [EBV] as an aetiologic agent in [CFS] associated with chronic tonsillitis and pharyngitis