Are there any bacteria that can receive ultrasound signals?
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.