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. 2007 Jun 5;38(9):893–908. doi: 10.1111/j.1365-2109.2007.01735.x

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This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

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Transmission electron microscopy of vesicle showing particles (PAR) of 50–96 nm in diameter and rod‐shaped structures (ROD) 155–207 nm long (Smith 2000).