We have analysed data on respiratory syncytial (RS) and parainfluenza type 3 (PF3) viruses reported to the Communicable Disease Surveillance Centre, London, over the period 1978-87. These confirm the annual winter epidemic of RS virus and show that, in England and Wales, PF3 is a summer infection with regular yearly epidemics.
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Easton et al. (1989) studied this question.
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