Are there any bacteria that can receive ultrasound signals? I'm looking for an example of bacteria that could receive ultrasound (at any ultrasound frequency) signal and possibly perform some (re)action afterwards.

I'm going to post a quick answer here, really a thought piece.

Usually to detect a sound wave you need a sounding board about the wavelength of the sound.

Bacteria are on the order of a few microns in length.

Ultrasound frequencies range from 2 to 200 MHz (and up I assume).

To have a wavelength on the order of 3 microns, a 100 MHz wave would be needed.

So only on the very high end of the range. If bacteria make sound though, they probably are on this frequency range.

I wonder if this has been looked at? Not sure it has. While in biology you never say never - if a bacterium really needs to pick up a wave it might have a clever adaptation to do so, but in the 100MHz + frequency range seems more likely.