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A study was carried out on 391 cases of bronchiolitis and pneumonia from different paediatric units in Rawalpindi/Islamabad, Pakistan. A clear winter spike of respiratory syncytial virus (RSV) was noted. It was found that there was a substantial increase of 30-50% in the positivity of RSV from December to February.
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Tariq et al. (2005) studied this question.
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