How ants cope with disease outbreaks SPEAKING OF SCIENCE D. Balasubramanian

 How ants cope with disease outbreaks

SPEAKING OF SCIENCE D. Balasubramanian 

Ants are associated with a range of very positive qualities - including a self-motivated work ethic, prepa-redness and long-term thinking, and a preference for collective effort. Many ant species are also social, and living in social groups offers many advantages. However, there are down-sides too. Among humans, the oc-currence of seasonal out-breaks of infections such as influenza and other disease-es is the result of the na-ture of the social structures humans live in. 

That is how we have learned the basic rules of limiting these out-breaks' effects. If you not-ice a general build-up of symptoms, you take leave from your workplace and isolate yourself for a few days. Altering one's social contact networks reduces the spread of pathogens. This process requires collective discipline - just the kind of qualities that ants are famous for. So how do ants living in their colonies cope with pathogens? In some ant species, individuals spread antimicrobial secretions from the metapleural gland on themselves, on larvae, and on their fellow nest dwellers. 

This gives rise to a 'social immunity': every individual in the co-colony has some protection against infections. Other, more dramatic measures have been observed. Researchers at the University of Lausanne in Switzerland introduced a worker black ant whose leg had been experimentally injured back among its companions. It was seen that the fellow ants quickly amputated this leg by re-peated bites at the joint linking the leg to the body (Current Biology, 34, 2024). A wounded limb would have attracted dis-ease-causing microbes and endangered other ants in the colony.

A more recent study looked at how ant colonies respond to an epidemic (Science, 390, 266, 2025).

The ant studied was the black garden ant, which is related to the Indian black ants that we see in and around our homes. The black garden ants build complex underground nests that have one main entrance, a central portion housing the queen, eggs, and larvae, and several sa-tellite chambers used by other ants in the colony and to store food and col-lect waste. Tunnels con-nect various parts of thenest. There is a clear divi-sion of labour, with some worker ants acting as nurse caretakers and others act-ing as foragers.

In the experiments, a single queen, with around 200 worker ants, began to build a nest. All ants have miniature QR codes stuck on them and video came-ras follow their move-ments. The scientists mon-itored the nest structures using micro-CT scans. One day later, 20 worker ants that had been exposed to a pathogenic fungus were in-troduced to the colony.

Over the next few days, the infected ants exited the nest more often and spent more time outside than their nestmates. This was self-isolating behavior. The architecture of the nest had also adapted: the en-trances were spaced furth-er apart than normal. The pace of work became fran-tic and focused on digging

longer tunnels. There were also fewer connections between chambers.

Together, these changes led to more segregation and restricted interactions between the segregated groups. High-value ants like the queen and the nurses had significantly lower exposure to the for-ager ants and remained healthy.

Sounds familiar? Hu-mans maintain quaran-tines, wear masks when in-teracting with others, and wash their hands often when faced with an epi-demic in our communities. Ants seem to have evolved their own, very effective distancing social measures.

(The article was written in collaboration with Sushil Chandani, who works in molecular modelling)

dbala@lvpei.org

sushilchandani@gmail.com

How Ants Cope with Disease Outbreaks: Nature’s Tiny Experts in Disease Control

Introduction

Disease outbreaks can threaten the survival of any community, whether human or animal. Surprisingly, ants have evolved remarkable strategies to protect their colonies from infections and epidemics. Despite living in densely populated nests where diseases can spread quickly, ant colonies have survived for millions of years by developing sophisticated hygiene and disease-management systems.

Scientists studying ant behavior have discovered that these tiny insects use methods similar to quarantine, sanitation, and social distancing to prevent the spread of harmful pathogens. Their strategies provide fascinating insights into how social organisms can cope with disease outbreaks.

Why Ant Colonies Are Vulnerable to Disease

Ant colonies often contain thousands or even millions of individuals living in close proximity. Such crowded conditions create an ideal environment for bacteria, fungi, and parasites to spread rapidly. If one infected ant enters the nest, the entire colony could be at risk.

To overcome this challenge, ants have developed collective defense mechanisms known as social immunity.

Social Immunity: The Colony's Defense System

Unlike humans, ants do not rely solely on individual immune systems. Instead, the entire colony works together to reduce disease transmission. This collective protection is called social immunity.

Social immunity includes behaviors that detect, isolate, and eliminate sources of infection before they can spread throughout the colony.

Grooming and Cleaning Behaviors

One of the most effective ways ants prevent disease is through grooming. Ants regularly clean themselves and each other to remove dirt, spores, and harmful microorganisms from their bodies.

This process helps reduce the chances of infection and keeps the colony healthy. Some ants even produce antimicrobial substances that help kill pathogens during grooming.

Isolation of Infected Individuals

Research has shown that ants can identify sick colony members through chemical signals. Once an ant becomes infected, healthy ants may avoid close contact with it or move it away from vulnerable areas of the nest.

In some species, infected ants voluntarily isolate themselves, reducing the risk of spreading disease to others. This behavior resembles quarantine measures used in human societies.

Removal of Dead Ants

Dead ants can become breeding grounds for dangerous microbes. To prevent infections, worker ants quickly remove dead bodies from the nest and deposit them in designated waste areas.

This behavior, known as necrophoresis, helps maintain nest hygiene and minimizes exposure to pathogens.

Use of Natural Antimicrobials

Many ant species produce antimicrobial chemicals from specialized glands. These substances can kill bacteria, fungi, and other harmful microorganisms.

Ants apply these chemicals to themselves, their nestmates, and even their nest environment, creating an additional layer of protection against disease outbreaks.

Division of Labor Reduces Risk

Ant colonies often organize work according to age and task. Younger ants usually stay inside the nest caring for larvae and the queen, while older workers perform riskier activities such as foraging outside.

This division of labor reduces the chances of external pathogens reaching the colony's most valuable members.

Lessons for Human Society

The disease-control strategies of ants demonstrate the importance of cooperation, hygiene, and early intervention. Their collective response to infection highlights how social behavior can significantly reduce disease transmission.

Scientists believe that studying ant colonies may help improve our understanding of epidemic management, public health strategies, and social immunity in other species.

Conclusion

Ants may be tiny, but their approach to disease prevention is remarkably advanced. Through grooming, quarantine-like behavior, waste management, antimicrobial defenses, and social cooperation, they successfully protect their colonies from deadly outbreaks. These natural strategies reveal how evolution has equipped ants with powerful tools to survive in crowded communities and offer valuable lessons for understanding disease control in the wider world.

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 How Ants Cope with Disease Outbreaks: The Amazing Science of Social Immunity in Ant Colonies

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