I ran a game of Corporation for my group a while ago. They are part of a colony team that have landed on an earth type planet and are building cities, mostly with huge 3d printer robots, in preparation for the majority of the colonists to move into when they arrive later. The planetary survey ship had been sending information back to Earth but the transmission was interrupted (attacked by a hostile, unknown craft) and crashed on the planet (a team will be sent to recover the data at some point where they will learn much more about the potential hazards on the planet).
I'm thinking up some complications for them to investigate and/or resolve and I'm stuck for inspiration on one. A city will have reported a midday fog bank rolling in, and then no more communications come from them. I would like this to be caused by a giant spore cloud released by the native flora and it has affected the humans when inhaled. The team sent in to investigate will find a few people who had the foresight to get into environmental suits. I am picturing the spores affect people when inhaled so anyone with a respiration mask should be fine.
I had planned for the break in communications will be due to the people being unable to get in touch with the others rather than the spores affecting the communications equipment itself.
I didn't really want to go for classics like it turns them mad or it sucks out all the moisture from the body so I was wondering: what potential side effects could flora spores on an earth-like planet have on humans?