In this universe, humans discovered a previously unknown fungus. Similar to the cordyceps fungus, this particular organism uses its spores to enter the body of its host, and grows within it. It will eventually leave the host dead and release more spores.
But let's say this does not happen. Although there is a high rate of mortality in the beginning, eventually the fungus adapts to the host body so that it can still spread its spores without killing the human. After all, this would just lead to heavy quarantine and an eventual extermination of infected humans.
So instead the fungus just inhabits the host body, and has the infected humans find fresh, uninfected humans to spread the spores into. At this point, they would still be marginalized, if not actively hunted by the military and governments to ensure more people don't get infected.
So how do these fungus people survive when the whole world is out to get them? Some ideas I played around with:
By the time they've adapted to staying within the host body without killing it, a lot of people have died already and society is in chaos, which makes it easier for them to fight or evade military/police/government/bounty hunter forces
Maybe they mess with the host body's genetic makeup to give them ehnanced physical attributes - numbing pain, heightening adrenaline etc.
Infected humans recognize each other and eventually they form their own groups and societies, where they can look out for each other - they are still "humans", with human thoughts, feelings and emotions. They just happen to have a deadly organism in their body whose bidding they also need to do
What are some other features of this "fungus people" society that you would expect to see?
EDIT: Adding some more detail to make it easier to answer:
The initial “outbreak” killed off a huge portion of the American population. The ensuing disease and sickness from the dead bodies and rotting corpses killed even more. The military firebombed/napalmed large portions of the country to control the outbreak, killing even more. There are only a few million survivors, scattered across the country in colonies and settlements. The government is in disarray, with the remnants doing what they can fight the growing infected civilization.
The infected are scattered across the country as well and have developed their own communities, looking for survivors to infect as compelled by the organism within them. They have come to accept this new status quo and actively seek to help their fungus buddies
Incubation period was short initially but started getting longer as the fungus adapted to the host body. This allowed for the infected to escape notice from authorities and vanish into the wilds
It started with one case – the patient zero who discovered it – and rapidly spread throughout the world. For the purposes of the story, I’m sticking to the United States.