anti + fungus

Antifungal is a recent word—it entered medical literature in the 1950s. For most of human history, fungal infections were local problems: ringworm, athlete's foot, thrush. Uncomfortable. Sometimes disfiguring. But not lethal. They stayed on the skin and mucous membranes, where immune systems could usually contain them.

Fungus is Latin for mushroom. The kingdom of fungi is older than trees, older than animals. Fungi eat decaying matter. They break down the dead. But in a weakened immune system, they become scavengers of the living. A fungus that would normally be contained in a healthy person becomes an assassin in someone with HIV or chemotherapy.

The first effective antifungal drug was amphotericin B, discovered in 1955 from soil samples. It worked by punching holes in fungal cell membranes. It also punched holes in human cell membranes, which made it toxic. But in a choice between amphotericin and death, the choice was clear. Medicine learned to tolerate poison.

The AIDS epidemic changed everything. When immunity collapsed completely, fungal infections exploded. Candida colonized the throat. Cryptococcus invaded the brain. Aspergillus filled the lungs. These were fungi that had always existed, ignored and irrelevant in healthy bodies. Antifungal drugs went from niche to necessity.