[mrsmith]

I wonder how far along a patient has to be for CT scans to show infection.

[datura]

I have read that even before symptoms there are ground glass opacities in the lungs that are visible on CT scans.

[grey_whiskers]

I wonder how far along a patient has to be for CT scans to show infection.

Not that far. A few *weeks* ago, a family showed up in Wuhan for testing. After the parents begged, the techs did a CAT scan on their symptomless 10-year-old son.

He had that characteristic ground-glass opacity in his lungs, with no fever or anything. This was IIRC from South China Morning Post, before China started quarantining tens or hundreds of millions.