Many human coronaviruses have ancestral host origins in species of bat. However, all instances I am aware of identified other animals as intermediary vectors:

  • SARS-CoV: Human ← Palm Civet / Raccoon ← Bat
  • MERS-CoV: Human ← Dromedary Camel ← Bat
  • HCoV-229E: Human ← Alpaca ← Bat

Are there any known cases of direct bat to human transmission of coronavirus?

Source: Bats and Coronaviruses, Viruses (2019)

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    $\begingroup$ Why the close vote for "homework"...? This isn't some school assignment, and I've tried researching this myself (as evidenced by the paper I cite), but I couldn't find any definitive information. Only speculation. $\endgroup$ – ukemi Mar 22 at 0:30
  • $\begingroup$ On this site, "homework") can apply to questions that not assigned as homework. For example, if it "addresses a basic biology concept that may seem trivial to biology professionals". That is of course very subjective, but would be my guess for why in the absence of any comment by whoever voted to close. I'm not sure I agree with that assessment, but I would say that (until and unless someone documents such a transmission) any answers you get are going to be speculative and opinion-based. ... $\endgroup$ – tyersome Mar 22 at 2:25
  • $\begingroup$ An answerable question would be "Are there any documented instances of coronaviruses being directly transmitted from bats to humans?". However, you seem like you have done enough research to already know the answer, which I presume is "no" since you wouldn't be asking if you had found such evidence. ——— Does that help you see why other users might vote to close this question? $\endgroup$ – tyersome Mar 22 at 2:30

It is possible, but unconfirmed, that the first incidents of SARS-CoV were directly infected by bats, and that palm civits were infected parallelly:

The new study demonstrates that Chinese horseshoe bats harbor a pair of SARS like viruses that are very closely related to the strain that caused the 2003-2004 pandemic and that these strains have the capacity to directly infect human cells and civet cat cells as well as bat cells. These findings suggest that bats may have directly infected humans and that civet cats may have been incidentally infected.

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