Final answer:
An organism that is unlikely to be transmitted by airborne droplets is Treponema pallidum, which causes syphilis, a sexually transmitted infection primarily spread through sexual contact.
Step-by-step explanation:
An organism that is unlikely to be transmitted by airborne droplets is Treponema pallidum. This bacterium causes syphilis, a sexually transmitted infection that is primarily spread through sexual contact rather than through airborne droplets. Syphilis can be transmitted from an infected individual to their sexual partner, but it is not typically spread through respiratory droplets.