JOURNAL ARTICLE

Does respiratory syncytial virus subtype influences the severity of acute bronchiolitis in hospitalized infants?

Nikolaos G Papadopoulos, Dimitrios Gourgiotis, Artem Javadyan, Apostolos Bossios, Konstantina Kallergi, Stelios Psarras, Maria N Tsolia, Dimitrios Kafetzis
Respiratory Medicine 2004, 98 (9): 879-82
15338801
Respiratory syncytial virus (RSV) subtypes A and B are present either simultaneously or alternate during yearly epidemics. It is still not clear whether clinical severity of acute bronchiolitis differs between the two subtypes. Reverse transcription polymerase chain reaction was used to subtype RSV in previously healthy infants hospitalized with RSV bronchiolitis during a winter epidemic. A severity index based on heart rate, respiratory rate, wheezing, difficulty in feeding and oxygen saturation was calculated upon admission. Infants infected with RSV subtype-A were found to have a significantly higher (more severe) clinical score than those infected with RSV-B. There was no statistically significant difference in duration of hospitalization or need of intensive care. Boys and infants younger than 3 months of age were also more severely affected than girls or older infants, respectively. These results support the notion that RSV-A-induced bronchiolitis is more severe than RSV-B-induced one, in agreement with the majority of previously published studies.

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