Human Metapneumovirus — An Important New Respiratory Virus

Abstract
Physicians who have an interest in infectious diseases know well that many infections cannot be assigned a microbial cause. This gap between what we observe and what we can explain is particularly obvious in the realm of respiratory infections. The article on human metapneumovirus infections by Williams and colleagues in this issue of the Journal (pages 443–450) represents substantial progress in bridging that gap.Our assumption has been that the gap is attributable to a combination of the insufficient sensitivity of our diagnostic tests and the existence of several as-yet-undiscovered microbes. Both of these assumptions turn out to be correct. . . .

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