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I've been looking at several sources on how the virus spreads and they all mention that the skin has to be broken, but does it mean broken to the naked eye?

A minor scratch where the skin appears unbroken and there was no bleeding could still have microscopic breaks of the skin, therefore it seems risky to rely on the naked eye.

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  • $\begingroup$ It seems some skin pathogens can't even infect visible skin breaches like abrasions (ncbi.nlm.nih.gov/pubmed/24722416). Better to be safe than sorry though when it comes to protecting skin from potentially lethal infections. $\endgroup$
    – Armatus
    Commented Mar 27, 2018 at 13:15

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I believe that your books refer to 'broken' not necessarily meaning broken to the naked eye, but as in any broken epidermis.

The outer layer of your skin that protects you against infection is the epidermis. It's a water-tight layer mostly composed of keratinocytes joined together by adherens junctions. Logically, even if you can't see a breach in your skin (epidermis), there may still be one. While the chance of getting an infection from a non-visible break is less than the chance of infection from a visible scratch, it's still possible.

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  • $\begingroup$ Source, please? $\endgroup$ Commented Oct 28, 2017 at 16:08

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