Sensibilidad del test de diagnóstico rápido SARS-CoV-2 Panbio en Atención Primaria / Sensitivity of the Panbio COVID-19 rapid antigen detection test in primary care

Introducción y objetivos: los pediatras de Atención Primaria necesitamos técnicas de diagnóstico rápido (TDR) fiables para prevenir la propagación de la enfermedad COVID-19 mediante un cribado temprano y eficaz a la espera de una vacuna. El objetivo de este trabajo fue evaluar como novedad en Atención Primaria, tanto en adultos como niños, sintomáticos y contactos asintomáticos, la sensibilidad (S) de los test de antígeno SARS-CoV-2 Panbio del laboratorio Abbott respecto a la reacción en cadena de la polimerasa (PCR).Pacientes y métodos: se incluyeron 591 pacientes (222 menores de 14 años) (249 sintomáticos y 342 contactos). Se calculó la sensibilidad (S) y la especificidad (E) junto con sus intervalos de confianza (IC) del 95%. La independencia de los dos resultados ha sido analizada mediante el test de McNemar.Resultados: la S del test en adultos fue del 81% (IC 95%: 66,16-96,34) y en niños del 80% (IC 95%: 34,94-100) dentro de los 5 primeros días. En contactos se evaluó la S en los cinco primeros días, en adultos (68%; IC 95%: 51,13-86,37), del 5.º al 9.º día (85%) y en niños (66%; IC 95%: 30,31-100). El tipo de contacto más frecuente fue domiciliario en un 52% de los casos. La E fue 100% en todos los casos.Conclusiones: el test rápido de antígeno SARS-CoV-2 Panbio puede ser útil para diagnóstico de adultos y niños los primeros cinco días de inicio de síntomas, así como entre el 5.º y 9.º día tras el contacto con positivo COVID-19 confirmado, pendiente de interpretar en futuros estudios. (AU)

Introduction and objectives: primary care paediatricians need reliable rapid diagnostic techniques (RDTs) to prevent the spread of coronavirus disease 19 (COVID-19) through early and effective screening while awaiting a vaccine. The objective of this study was to evaluate the sensitivity (Sen) of the Abbott laboratory SARS-CoV-2 Panbio antigen test, newly introduced in primary care, in both adults and children (symptomatic and asymptomatic contacts) in comparison to the polymerase chain reaction (PCR) test.Sample and methods: the study included 591 patients (222 aged less than 14 years) from 7 primary care centres; of who 249 were symptomatic and 342 asymptomatic contacts. We calculated the Sen and specificity (Spe) with their 95% confidence intervals (CIs). We assessed the independence of the two results with the McNemar test.Results: the Sen of the test within 5 days from onset was 81% in adults (95% CI, 66.16-96.34) and 80% in children (95% CI: 34.94-100). In contacts, we assessed the Sen within 5 days, in adults (68%; 95% CI: 51.13- 86.37), in 5 to 9 days (85%) and in children (66%; 95% CI: 30.31-100). The most frequent source of exposure were household contacts (52% of the cases). The Spe was 100% in every case.Conclusions: the Panbio SARS-CoV-2 rapid antigen test can be useful for diagnosis in adults and children within 5 days of onset, and from days 5 to 9 in contacts of confirmed COVID 19 cases. Further studies are required for adequate interpretation of the latter result. (AU)

CHARGE association, hyper-immunoglobulin M syndrome, and conjunctival MALT lymphoma.

PURPOSE: To report a case of a 5-year-old child with CHARGE association and bilateral conjunctival mucosa-associated lymphoid tissue (MALT) lymphoma treated with topical interferon-alpha. METHODS: Case report. RESULTS: A 5-year-old girl, diagnosed with nonclassical CHARGE association and hyper-immunoglobulin M (IgM) syndrome, was referred with a 2-month history of suspected purulent bilateral streptococcal conjunctivitis. Clinical symptoms did not resolve despite multiple antibiotic treatments, and her clinical course was attributed to underlying immunodeficiency. Biomicroscopy showed salmon-colored, nodular lesions occupying both fornices and caruncles. Inferior conjunctival biopsy was performed, and MALT lymphoma was diagnosed. Bilateral treatment was initiated with topical interferon-alpha, applied 3 times a day at a concentration of 5 x 10 U/m/d, for 4 months. Complete regression of symptoms and conjunctival lesions was achieved. No recurrences have been observed after 1-year follow-up. CONCLUSIONS: We report the use of topical interferon-alpha as treatment for bilateral conjunctival MALT lymphoma in a young child with CHARGE association and hyper-IgM syndrome.