"Airborne droplets" refers to tiny particles of liquid, such as water or bodily fluids, that are floating in the air. These droplets can spread diseases or infections when someone breathes them in. Full definition
One of three uninfected ferrets in neighboring cages also caught the virus, suggesting that it can also transmit through airborne droplets when an infected animal sneezes or coughs. (sciencenews.org)
Influenza: the great and terrible Influenza viruses rapidly spread by airborne droplets during sneezing, coughing and even talking. (star-writers.com)
So although these Bronze Age people suffered from the plague, they probably got it from airborne droplets, contaminated food, or the transmission of bodily fluids, rather than from fleas that infested rodents, as did Europeans during the Black Death and other pandemics. (sciencemag.org)