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The Surprising Role of Animals in Disease Detection

Some of the most effective disease detectors might already be in your home—your pets. Numerous instances exist where pets, particularly dogs, have alerted their humans to health issues, such as malignant melanoma, through behaviors like licking or sniffing specific areas.

Animals of various species, including ants, mice, and dogs, have shown remarkable abilities in detecting diseases in humans during experiments. These diseases range from cancer and urinary tract infections to COVID-19 and Clostridium difficile. Early detection of these conditions is crucial, especially for vulnerable or immunocompromised individuals.

Dogs are perhaps the best-known animal for disease detection. They can identify conditions like Parkinson’s disease, bladder cancer, and malaria. Trained medical alert dogs can also sense epileptic seizures and low blood sugar levels in diabetic patients. A dog’s exceptional sense of smell, which is believed to be over 10,000 times better than humans, allows them to detect specific odors at very low concentrations.

Rats, particularly the African giant pouched rat, have been trained to detect the smell of land mine explosives and tuberculosis. These rats can quickly and accurately identify tuberculosis in sputum samples, making them valuable in areas with limited resources. Their training involves rewarding them with treats like avocados and bananas, leading to an impressive success rate of 81% in detecting positive tuberculosis cases.

Even honeybees have shown the ability to detect diseases such as lung cancer, tuberculosis, and COVID-19. Their sensitivity to low-concentration odors allows them to identify chemical changes linked to disease. Researchers have trained honeybees to respond to specific smells by rolling out their tongues for a sugar reward, making them a potential low-cost option for rapid disease screening.

Animals can detect diseases by sensing subtle changes in volatile organic compounds (VOCs) that the body releases. These VOCs vary in composition and concentration based on an individual’s health status. The ability of animals to detect these changes can make them effective, non-invasive, and cost-efficient screening tools for various health conditions.

The detection skills of animals are not only beneficial for humans but also extend to detecting diseases in other animals. For instance, the worm C. elegans can identify cancer in samples from both humans and pets.

Currently, animals used in disease detection are considered supplementary tools alongside medical diagnostics. However, with proper regulatory frameworks, they could become integral components of diagnostic processes. For example, detection dogs have been faster and more cost-effective in screening COVID-19 samples compared to PCR testing.

While utilizing animals’ abilities for disease detection is promising, it is essential to prioritize their health and welfare. Ethical considerations must be taken into account to ensure that the use of animals in disease screening is safe, efficient, and humane.