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Some parasites and pathogens can alter animal behavior, but no known organism turns people into movie-style zombies. The clearest real example is a fungus that changes the behavior of particular ants: infected ants climb vegetation, clamp onto it, and die while the fungus prepares to disperse spores. That is a striking, host-specific biological strategy—not human mind control.
What is the real zombie ant fungus?
Several fungi in the genus Ophiocordyceps infect particular insect hosts. In the best-known ant example, infected carpenter ants leave their ordinary foraging routes, climb nearby plants or twigs, and attach themselves to vegetation before dying. A fungal structure later grows from the dead ant in a position that can help release spores onto ants below. The behavior places the fungus where its next hosts are more accessible; it is not evidence that the fungus can control any animal it encounters. A 2024 review of host manipulation describes this pattern.
How the fungus produces the behavior is not fully understood. In a 2024 review, Emmeline van Roosmalen and Charissa de Bekker summarize evidence that “the secretion of parasite proteins and light-driven biological rhythms are likely involved in the infection and manipulation biology of Ophiocordyceps and other manipulating parasites.” Those are proposed contributors, not a complete or settled explanation; researchers are still investigating how infection and behavioral effects work, and whether similar mechanisms evolved independently. Read the review in Annual Review of Microbiology.
Can parasites turn people into zombies?
No established evidence shows a parasite turning a person into a zombie in the fictional sense of taking over their mind and directing their behavior. The animal examples below involve different organisms and evidence: a fungus that alters behavior in specific insect hosts, a protozoan studied for animal effects and debated human associations, and a virus that causes neurological disease.
#1 Best Overall
Toxoplasma gondii: animal effects, unsettled human claims
Toxoplasma gondii is a protozoan parasite. Researchers have studied behavioral changes in infected rodents and whether some changes could benefit transmission. Human research has examined possible behavioral associations, but an association does not establish that the parasite caused the behavior or that manipulation is adaptive. A 2020 review states: “The assumption of an adaptive manipulation of humans by T. gondii in the sense of a cause-effect relationship is not proven.” The same review discusses host inflammation and immune responses as possible alternative explanations for behavioral changes. See the review on PubMed; a separate 2020 review also examines how media claims compare with the evidence. Read that review.
A 2021 review reported that up to one-third of the global human population may be infected with T. gondii. That is the review’s broad estimate of infection, not a current exact count and not an estimate of how many people experience behavioral effects. The Annual Review of Animal Biosciences review covers recent work on infection and host behavior.
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Rabies: brain-affecting disease, not zombie control
Rabies is a virus that affects the brain and can cause neurological symptoms. It is a closer comparison than an insect-specific fungus for understanding how an infection can affect nervous-system function, but disease symptoms are not the same thing as purposeful, precise mind control. Rabies does not reproduce the fictional zombie condition.
How to tell demonstrated manipulation from a dramatic claim
A change in an infected animal’s behavior does not, by itself, prove that a parasite evolved to manipulate its host. Researchers need to distinguish a parasite-driven effect from the host’s response to infection, including inflammation, and consider whether the behavior benefits the parasite’s transmission. A 2024 review of parasite-associated circadian rhythms emphasizes those distinctions and the need to test mechanisms and effects on both host and parasite fitness. Read the review.
| Organism | Host and observed effect | What the evidence supports | What remains uncertain |
|---|---|---|---|
| Ophiocordyceps fungi | Specific insect hosts, including carpenter ants: infected ants climb and attach to vegetation before dying. | A striking behavioral pattern that positions the fungus to disperse spores. | The detailed mechanisms behind infection and behavior are still under study; this is not evidence of human control. |
| Toxoplasma gondii | Animal hosts including rodents; human studies have examined possible behavioral associations. | Animal effects are studied; human findings do not establish a causal, adaptive manipulation of people. | How to interpret human associations, including the role of host responses such as inflammation. |
| Rabies virus | Infected mammals, including humans: a brain-affecting infection with neurological symptoms. | A real neurological disease, not a parasite-mediated zombie state. | The cited sources do not establish fictional-style mind control. |
Could the fungus from The Last of Us infect humans?
The ant-infecting Ophiocordyceps example does not show that the fungus can infect or control people. A 2024 commentary from the U.S. Centers for Disease Control and Prevention says adaptation across hosts would take time and would not be expected over just a few years. That is a reason to reject a rapid human-zombie scenario, not a quantified prediction about every possible long-term change. Read the CDC commentary.
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