You can easily find a lot of pictures of the SARS-CoV-2 virus. But although it should be trivial for an electron microscope to measure the size, I am not able to find accurate size information.

What is the size (diameter) of the SARS-CoV-2 virus?
(Why does some virus particles seem to have a different size?)

  • $\begingroup$ virology-online.com/viruses/CORZA4.htm. $\endgroup$
    – David
    Commented Feb 25, 2020 at 17:06
  • 2
    $\begingroup$ Although your question is straightforward, it would be great if you could explain why this information is useful to you. $\endgroup$
    Commented Feb 26, 2020 at 13:41
  • $\begingroup$ @WYSIWYG As a researcher I'm sure you can think of at least 5 reasons, but we can probably invent another 100. But I find your request irrelevant to the question, especially in the light as 2 people have already voted for closing it. So please contact me elsewhere in case you'd like to know more. $\endgroup$
    – not2qubit
    Commented Feb 27, 2020 at 19:00
  • $\begingroup$ @not2qubit It is not for my personal query. Supporting the question with a rationale helps other readers understand the post better. Since our aim here is not simply help people with their specific queries but make a repository of useful information, it is always good to have some background in the posts. $\endgroup$
    Commented Feb 28, 2020 at 9:08
  • 5
    $\begingroup$ It would be far more interesting to know on what grounds people are close-voting (more or less) every question I have on this SE? Apparently the common courtesy of at least explaining why they down-vote or close-vote seem completely lacking here... The perfect way to alienate just about every new user you have here. $\endgroup$
    – not2qubit
    Commented Feb 28, 2020 at 16:57

1 Answer 1


Electron micrographs of negative-stained 2019-nCoV particles were generally spherical with some pleomorphism (Figure 3). Diameter varied from about 60 to 140 nm. Virus particles had quite distinctive spikes, about 9 to 12 nm, and gave virions the appearance of a solar corona.

--A Novel Coronavirus from Patients with Pneumonia in China, 2019

Figure 3 from that article:

enter image description here


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