Newly discovered fungi turn flies into parasite-spewing zombies

The video discusses how two fungal species, Strongwellsea tigrinae and Strongwellsea acerosa, infect Danish flies, turning them into 'zombies' that spread spores. The fungus enters through the fly's cuticle, consuming its internal organs while keeping it alive to spread spores. Despite the severe infection, only a small percentage of flies are affected. Researchers suggest the fungi may produce amphetamine-like substances to keep the flies active until they are fully consumed.

What percentage of flies does the fungus typically infect in a healthy population?

What substances do researchers suspect the fungi may produce?