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In most cases, the tick must be attached for 36 to 48 hours or more before the Lyme disease bacterium can be transmitted.

https://www.cdc.gov/lyme/transmission/index.html

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We're taught this in med school. Along with NOT using flame to remove them and instead using something like tweezers while preserving the tick (for identification).

That page doesn't cite any sources, so it's not really any more credible than any other random blog. I would consider this to be more credible: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4278789/

More importantly though, Lyme is just one of over a dozen tick-borne illnesses, some of which can be transmitted in as little as 15 minutes.

“That page” is from the Center for Disease Control — a division of the US Dept of Health and Human Services. Credibility is subjective, but I would say it is in fact more credible than a random blog.

In many cases, the CDC is the source (or at least funds them).

OK, but why would you trust the recommendation if you don't know why they're making it?

Because rarely do we get accurate descriptions of the why behind most advice. Trusting credible people and institutions is a necessity unless you're planning on doing foundational research for everything in your life.

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