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OBJECTIVE: Due to the high cost and short term of passive immunization against the respiratory syncytial virus, the main virus causing acute viral bronchiolitis, predicting epidemic regions and epidemic months is extremely important. The objective of this study is to identify both the month when the seasonal peak begins and Brazilian regions and states with the highest incidence of monthly hospitalizations due acute viral bronchiolitis. METHODS: Based on data obtained from DATASUS, monthly hospitalization rates due acute viral bronchiolitis were calculated for every 10,000 live births to children under 12 months of age in all Brazilian states and the Federal District between 2000 and 2019. Seasonal autoregressive integrated moving average models were estimated to forecast monthly hospitalization rates in 2020. RESULTS: A higher incidence of hospitalizations was found for male children, especially under six months of age. As for Brazilian regions, between 2000 and 2019, the South region registered the highest incidence of hospitalizations, followed by the Southeast, Midwest, North and Northeast regions, in this order. Considering the seasonal peak, the period between March and July 2020 comprised the highest expected hospitalization rates. CONCLUSIONS: Palivizumab is suggested to be started between February/March and June/July for most Brazilian states, with the exception of Rio Grande do Sul, which, in addition to presenting the highest rates of hospitalizations for acute viral bronchiolitis per 10,000 live births, has the longest seasonal peak between May and September.

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This review addresses differences in respiratory syncytial virus (RSV) lower respiratory tract illness (LRTI) between industrialized and developing countries and provides observations associated with the dissimilar consequences of viral infection in both environments. RSV LRTI is an important cause of morbidity and mortality in infants worldwide. Its burden is highest in developing countries, where most hospitalizations and mortality occur. Palivizumab has been approved for disease prevention in premature infants in numerous countries but its cost and requirement for several doses hampers its routine use. The significant gap between low- and high-income countries in mortality rates stresses the need to identify specific risk factors for RSV LRTI prevention in different populations. CONCLUSION: RSV LTRI continues to be a serious problem for industrialised and developing countries, although mortality occurs preferentially in the latter. Several vaccines and monoclonal antibodies to prevent severe disease are advancing steadily in late phase trials. The next decade may witness a change in the landscape of RSV infections in young infants.

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The landscape of infant bronchiolitis and viral pneumonia may be altered by preventive interventions against respiratory syncytial virus under evaluation today. Pediatric wards in 2018 in developing countries may differ from those attended by future generation pediatricians who may not witness the packed emergency rooms, lack of available beds, or emergency situations that all physicians caring for children with RSV experience every year. In this review, we describe and discuss different prevention strategies under evaluation to protect pediatric patients. Then, we outline a number of potential challenges, benefits, and concerns that may result from successful interventions after licensure.

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Respiratory syncytial virus (RSV) infection is the leading cause of hospitalisation for respiratory diseases among children under 5 years old. The aim of this study was to analyse RSV seasonality in the five distinct regions of Brazil using time series analysis (wavelet and Fourier series) of the following indicators: monthly positivity of the immunofluorescence reaction for RSV identified by virologic surveillance system, and rate of hospitalisations per bronchiolitis and pneumonia due to RSV in children under 5 years old (codes CID-10 J12.1, J20.5, J21.0 and J21.9). A total of 12,501 samples with 11.6% positivity for RSV (95% confidence interval 11 - 12.2), varying between 7.1 and 21.4% in the five Brazilian regions, was analysed. A strong trend for annual cycles with a stable stationary pattern in the five regions was identified through wavelet analysis of the indicators. The timing of RSV activity by Fourier analysis was similar between the two indicators analysed and showed regional differences. This study reinforces the importance of adjusting the immunisation period for high risk population with the monoclonal antibody palivizumab taking into account regional differences in seasonality of RSV.

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Respiratory syncytial virus (RSV) infection is the leading cause of hospitalisation for respiratory diseases among children under 5 years old. The aim of this study was to analyse RSV seasonality in the five distinct regions of Brazil using time series analysis (wavelet and Fourier series) of the following indicators: monthly positivity of the immunofluorescence reaction for RSV identified by virologic surveillance system, and rate of hospitalisations per bronchiolitis and pneumonia due to RSV in children under 5 years old (codes CID-10 J12.1, J20.5, J21.0 and J21.9). A total of 12,501 samples with 11.6% positivity for RSV (95% confidence interval 11 - 12.2), varying between 7.1 and 21.4% in the five Brazilian regions, was analysed. A strong trend for annual cycles with a stable stationary pattern in the five regions was identified through wavelet analysis of the indicators. The timing of RSV activity by Fourier analysis was similar between the two indicators analysed and showed regional differences. This study reinforces the importance of adjusting the immunisation period for high risk population with the monoclonal antibody palivizumab taking into account regional differences in seasonality of RSV.

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Bronquiolite viral aguda consiste em uma afecção viral que acomete lactentes com idade inferior a dois anos, sendo o pico de incidência abaixo de seis meses de vida. O quadro clínico consiste em sintomas de infecção de vias aéreas superiores, que evolui após dois a quatro dias com cansaço, dispneia, taquipneia, além de esforço respiratório. Febre e redução da aceitação da dieta também podem ocorrer. Apneia tem sido relatada em casos graves ou em prematuros. O diagnóstico baseia-se na história clínica e no exame físico, sendo exames complementares reservados quando há suspeita de outros diagnósticos ou de complicações. O tratamento é suportivo, sendo a oxigenoterapia indicada para pacientes com saturação de oxigênio abaixo de 90%. Atualmente, o corticoide oral não tem indicação no tratamento. Broncodilatadores não são indicados de rotina e o uso da salina hipertônica é controverso. O antiviral, ribavirina, tem indicação em casos específicos, devido aos efeitos adversos e ao alto custo. A profilaxia da BVA é fundamental, sendo a lavagem das mãos e o uso de álcool, de máscaras e de luvas essenciais para prevenção da doença. Como medicação profilática, o palivizumabe é indicado apenas em casos selecionados.(AU)

Acute bronchiolitis consists of a viral infection that affects children younger than 2 years old, with the peak of incidence under 6 months. The clinical disease has symptoms of infection of the upper airway, which develops after 2-4 days with fatigue, dyspnea, tachypnea, and respiratory effort. Fever and reduction of dietary compliance, may also occur. Apnea has been reported in severe cases or premature. The diagnosis is based on clinical history and physical examination, reserved additional tests when there is a suspicion of other diagnoses or complications. Treatment is supportive, the oxygen therapy is indicated for patients with oxygen saturation under 90%. Currently, oral corticosteroids has no indication for the treatment. The use of bronchodilators is not routinely indicated and the use of hypertonic saline is controversial. The use of the antiviral ribavirin is indicated in specific cases because there are adverse effects and high costs. Prophylaxis of bronchiolitis is fundamental, and hand-washing, use of alcohol, use of masks and gloves are essential for disease prevention. The use of palivizumab is indicated in selected cases.(AU)

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Bronchiolitis is a common childhood disease and is the leading cause of hospitalization in children under 2 years, lower respiratory tract infection. It is characterized by upper respiratory symptoms which lead to lower respiratory symptoms for primary infection or reinfection with a viral pathogen, more identified is the respiratory syncytial virus. Despite the frequency and importance of this disease, there is still much controversy regarding the most appropriate treatment protocol. Its definition and treatment remain the subject of ongoing debate and the subject of study, seeking to reach a global consensus on the appropriate approach to this entity, so this article is a practical approach to bronchiolitis, based on the available scientific evidence to epidemiology, clinical manifestations, diagnosis, treatment and prevention of bronchiolitis. The implementation of a treatment algorithm is feasible and can help reduce operating errors and the rate of inadequate prescription of steroids and antibiotics in children with bronchiolitis.

La bronquiolitis, es una enfermedad frecuente en la infancia y constituye la principal causa de ingreso hospitalario en los menores de 2 años, por infección del tracto respiratorio inferior (ITRI). Se caracteriza por síntomas respiratorios superiores que conducen a síntomas respiratorios inferiores por la infección primaria o la reinfección con un patógeno viral, el más identificado es el virus respiratorio sincicial (VRS). A pesar de la frecuencia e importancia de esta enfermedad, aún existen grandes controversias en cuanto al protocolo terapéutico más adecuado. Su definición y tratamiento siguen siendo tema de constantes debates y motivo de estudio, buscando llegar a un consenso mundial sobre el adecuado abordaje de esta entidad, por lo que este artículo es un enfoque práctico de la bronquiolitis, basado en la evidencia científica disponible en cuanto a la epidemiología, manifestaciones clínicas, diagnóstico, tratamiento y prevención de la bronquiolitis. La implementación de un algoritmo terapéutico es factible y puede ayudar a reducir los errores de manejo y la tasa de prescripción de esteroides y antibióticos, inadecuados en niños con bronquiolitis.

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