There was some success reported in treating pseudomonas in skin infections using Manuka honey. That led to the hope that it might also be effective at treating pseudomonas lung infections because people with Cystic Fibrosis, COPD and bronchiectasis are susceptible to them.
I was a little skeptical of the theory - putting honey on the bacteria on the skin (or in a petri dish) seemed vastly different than trying to get it onto the bacteria hiding deep in lung tissue. This brief report: https://cronfa.swan.ac.uk/Record/cronfa50103 seems to say just that.
"Ex vivo" means "outside the body" - tests performed there showed that honey plus antibiotics placed on the bacteria inhibited growth. Unfortunately, there doesn't seem to be a way (yet) to deliver the antibacterial properties of the honey into the lungs. That difficulty is described here: https://www.labroots.com/trending/microbiology/14893/manuka-honey-kills-cystic-fibrosis-pathogens-culture
As with all things in medicine, stay tuned for further development.
Sue