Could The Last of Us Really Happen? The Science Behind the Fungal Apocalypse
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Could The Last of Us, the critically acclaimed video game and television series depicting a world ravaged by a Cordyceps fungus that turns humans into zombie-like creatures, actually happen? The short answer is no, not in the way the show portrays it. While the underlying concept draws inspiration from real-world biology, the specific scenario presented in The Last of Us relies on a highly improbable series of events and biological leaps. However, the series does shine a light on the potential dangers of fungal infections and the importance of understanding their mechanisms. The premise relies on the fiction that fungi that infect insects are mutating into a threat for humans when it learns to survive in higher temperatures.
Understanding the Reality of Cordyceps
The Truth About Cordyceps
The Cordyceps fungus does exist in nature. It’s a genus of ascomycete fungi that primarily infects insects and arthropods. The most famous example is Ophiocordyceps unilateralis, often called the “zombie-ant fungus.” This fungus manipulates the behavior of ants, causing them to climb to a high vantage point before the fungus kills them and sprouts a fruiting body to release spores. These spores infect other ants, continuing the cycle. The fungus only infects ants and no other fish, amphibians, or mammals. Insects are a much more rudimentary system, with no correlation with that fungus in humans.
Why a Cordyceps Apocalypse is Unlikely
Several factors make a Cordyceps-driven human apocalypse extremely unlikely:
- Species Specificity: Cordyceps fungi are highly specialized. Each species typically infects only a narrow range of insect hosts. The specific Ophiocordyceps that infects ants, for example, can’t infect spiders, and neither can infect humans. This is because of complex biochemical interactions between the fungus and its host. The fungus needs to specifically bind to receptors and overcome the host’s immune system, which is highly tailored for each species.
- Mammalian Physiology: Mammals, including humans, have a significantly more advanced and complex immune system than insects. Our bodies also maintain a higher internal temperature (around 37°C or 98.6°F), which is often inhospitable to many fungi, including most Cordyceps species. Most can’t survive in these temperatures.
- Limited Mutation: While fungi, like all organisms, can mutate, the probability of a Cordyceps species mutating to overcome all the barriers to human infection (immune system, body temperature, species specificity) is exceedingly low. Such a mutation would require a complete overhaul of the fungus’s cellular machinery and a brand-new arsenal of virulence factors.
- Antifungal Treatments: We have a growing arsenal of antifungal drugs that could be used to treat fungal infections in humans. While some fungi are becoming resistant to these drugs, research and development are ongoing. It’s unlikely that a newly mutated Cordyceps would be resistant to all existing treatments right from the start.
Fungal Threats are Real, Just Different
While a Cordyceps apocalypse is firmly in the realm of fiction, the threat of fungal infections in humans is very real and is growing. Fungi like Candida auris, Aspergillus, and Cryptococcus are increasingly causing serious and even deadly infections, especially in individuals with weakened immune systems. These fungi can cause a range of diseases, from skin infections to pneumonia to meningitis.
The rising incidence of fungal infections is driven by factors such as:
- Climate Change: Rising temperatures can create environments more hospitable to certain fungi, potentially expanding their geographical range.
- Increased Use of Antifungal Drugs: Overuse of antifungal medications in agriculture and medicine is driving the evolution of drug-resistant fungi.
- Increased Number of Immunocompromised Individuals: Medical advances have led to an increase in the number of people living with conditions that weaken their immune systems, such as HIV/AIDS, cancer, and organ transplantation.
The Last of Us: More Than Just a Thrill
Despite its fictional nature, The Last of Us serves as a valuable thought experiment, highlighting the importance of understanding the potential dangers of infectious diseases, including those caused by fungi. It reminds us that pathogens can evolve, and that emerging infectious diseases pose a constant threat to global health. In addition, the game can be used as an educational tool for understanding virology and infection. Learn more by engaging with resources such as the Games Learning Society (GamesLearningSociety.org), which explores the intersection of games and education.
Frequently Asked Questions (FAQs)
Here are 15 frequently asked questions related to the possibility of The Last of Us happening, drawing from the provided text.
Can Cordyceps infect humans in real life?
No, the Cordyceps species that infects insects cannot currently infect humans. They are highly specialized to target specific insect species.
Is the Cordyceps brain infection possible in humans?
No. Ophiocordyceps fungi are highly specialized and only infect a limited range of insects. They do not infect humans.
Could the virus from The Last of Us be real?
Yes, the fungus from The Last of Us is based on a real fungus called Ophiocordyceps unilateralis. However, it does not infect humans.
Could the Cordyceps fungus really take over humanity?
While Cordyceps cannot currently invade humans, some experts believe it is unlikely to evolve to do so any time soon, if ever. It’s a very slow and improbable hypothesis.
Can the virus in The Last of Us be cured?
In the fictional world of The Last of Us, there are no preventatives or cures for the Cordyceps infection. In reality, we have and are developing antifungal treatments for fungal infections.
What kills Cordyceps?
An autoclave can effectively sterilize substrates and kill Cordyceps.
Can you eat Cordyceps?
Cordyceps mushrooms are generally thought to be safe to eat. However, potential negative side effects include upset stomach, nausea, and loose stools. People with certain medical conditions should avoid Cordyceps.
What would happen if a human ate Cordyceps?
Cordyceps is not poisonous and is often used in traditional medicine and as a dietary supplement. However, consuming large amounts can cause adverse effects such as headaches and allergies.
Will there be a zombie apocalypse ever?
According to scientists, a zombie apocalypse is not impossible, but it is extremely unlikely. Prions are abnormal proteins that can cause other proteins in the brain to misfold, leading to zombie-like behavior.
Why can’t Cordyceps infect humans?
Humans have advanced immune systems and a higher body temperature than Cordyceps prefers, making it difficult for the fungus to infect us.
Why aren’t animals infected in The Last of Us?
The Cordyceps in The Last of Us is specialized for humans, similar to how real-world Cordyceps species are specialized for specific insects.
How did the virus start in The Last of Us?
In the game, the Cordyceps infection began spreading after crops became infected in South America.
Can Ellie infect others in The Last of Us?
Ellie almost certainly cannot infect others. Her immunity is a plot point in the series.
How long does it take a person to be fully infected with Cordyceps in The Last of Us?
The Cordyceps infection in The Last of Us takes over the host’s brain completely after two days. Stage one begins within two days of infection.
Could fungus infect humans like in The Last of Us?
There is zero correlation between the “zombie ant” fungus and humans. No Ophiocordyceps species invades any fish, amphibians, or mammals.