Outdoor cats can be exposed to dangerous germs — here’s how to protect you and your pets, according to more than 400 studies
Pets form an important part of many people’s lives, providing meaningful companionship. However, our pets can sometimes also be a source of unwelcome pathogens and diseases, particularly if they frequently roam outdoors.
We are ecologists and a veterinarian who study wildlife health and the movement of pathogens among wildlife, domestic animals and people. If you let your cat outdoors, or if outdoor cats visit your yard, our recent findings may be relevant.
Zoonotic pathogens are organisms that can infect both animals and humans. From a pathogen’s perspective, humans are just another animal host. Wildlife is often emphasized as a source of emerging disease for humans because there are vastly more wild animal species than domestic animal specie
However, even if a pathogen is capable of infecting people, it needs a way to reach us. Humans share more zoonotic pathogens with domestic animals than with wildlife, because domestic animals live close to us. Pathogens benefit even further if they can infect a companion animal.
In our newly published research, we compiled data from more than 400 studies to investigate how a cat’s lifestyle, whether they’re mostly indoors, outdoor-roaming or feral, affects that cat’s likelihood of carrying pathogens that can infect people.
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Across this compilation, there were nearly 100 pathogens detected in cats that are considered zoonotic and capable of infecting humans. Familiar examples are rabies, Toxoplasma gondii, roundworms and Salmonella.
Our research
We found that outdoor-roaming pet cats had three to five times the odds of carrying a zoonotic pathogen compared with indoor-only cats. More surprisingly, cats allowed to roam outdoors had similar odds of carrying at least one zoonotic pathogen as feral cats. Outdoor-owned cats carried fewer types of pathogens than feral cats, but the same pathogens that infect feral cats can also infect owned cats.
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These risks become a large-scale problem because pet cats that roam freely interact closely with people, wildlife and other domestic animals. Across the studies we reviewed, about 60 per cent of owned cats had unsupervised outdoor access; in some regions, that rate exceeded 90 per cent.
Roaming cats hunt, interact with wildlife or other domestic animals, and move through environments contaminated with pathogens and toxins. Research suggests that cat owners may underestimate hunting by around 80 per cent, meaning that many prey captures and animal contacts go unnoticed.
These interactions are not uncommon and not limited to so-called pest species. Single-country estimates of wildlife killed by cats run into the billions, with more than 2,000 wildlife species documented as prey for domestic cats.
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Cats hunt animals that can carry zoonotic pathogens, including rodents, birds and bats, many of which would otherwise have little direct contact with people.
(Image credit: Anton Darius)
Cats hunt animals that can carry zoonotic pathogens, including rodents, birds and bats, many of which would otherwise have little direct contact with people. Owned cats might bring home rodents carrying viruses, and there are documented cases of cats bringing rabies-positive bats into homes. A cat returning home with prey can therefore create a pathway by which pathogens circulating in wildlife populations reach people.
In addition, it is not only owners who are at risk. Outdoor cats defecate in gardens, parks, playgrounds and other shared spaces, potentially leading to high contamination rates. One study estimated that outdoor cats deposited more than 60 tonnes [60 tons] of feces per 10,000 households each year.
Depending on the parasite, feces can contain hundreds to hundreds of thousands of parasite eggs that can persist in soil or water for months to years, which can infect people or other animals that come in contact with those eggs.
What cat owners can do
The most straightforward intervention is also the most economical and humane: prevent unsupervised roaming. That does not mean denying cats access to the outdoors. It can mean building “catios” or enclosures, leash walks, supervised time outside or other forms of contained outdoor access.
Using systems like “catios” or leash walks can help minimize pathogens for cats.
(Image credit: Carlos G. Lopez)
Veterinary care still matters. Treating existing parasitic infections and vaccinating against diseases like rabies are essential precautions, even for indoor cats. Since neither vaccines nor anti-parasitic treatment cover the full spectrum of wildlife-associated pathogens, managing exposure remains the more comprehensive protective approach.
The free-roaming debate is often framed as a false choice: either cats roam freely, or they are deprived of a natural life. That framing is misleading and inconsistent with how we manage other companion animals.
We do not assume dogs need unrestricted access to roads, neighbors’ yards or to hunt wildlife to have good welfare. Indoor cats and cats with supervised outdoor access can live healthy, enriched and longer lives.
Policies and strategies that address how and where owned cats roam outdoors can help safeguard biodiversity, feline and wildlife welfare and public health. That is the central insight of One Health, that the same choices that protect ecosystems can also protect the animals and people who share them.
This article was co-authored by David Lapen, who works for and receives research funding from Agriculture and Agri-Food Canada.
This edited article is republished from The Conversation under a Creative Commons license. Read the original article.
The Untapped Bounty: Unlocking the Nutritional Riches of Acorns
In the tapestry of autumn’s bounty, amidst the vibrant hues of falling leaves, lies a humble, often overlooked treasure: the acorn. This modest nut, the fruit of the majestic oak tree, has nourished a wide array of creatures and cultures throughout history. Yet, in modern times, its value has been largely forgotten, overshadowed by more conventional food sources. This article aims to rediscover the acorn’s potential, not only as a sustainable food source but as a powerhouse of nutrition and health benefits. As we delve into the world of acorns, we uncover the secrets to transforming these nuts into a palatable delight, along with exploring the myriad benefits they offer. Embracing acorns in our diet is not merely a nod to our foraging ancestors but a step forward in our journey towards sustainable living and nutritional wellness.
The Nutritional and Health Benefits of Acorns
Acorns are more than just a survival food; they are a testament to nature’s abundance, offering a wealth of health benefits that deserve recognition. Here is a comprehensive list of the many virtues these nuts hold:
Rich Nutrient Profile: Acorns are a powerhouse of essential nutrients, including vitamins A and C, which are vital for immune function and skin health, respectively. They also offer a good dose of B vitamins, crucial for energy metabolism and brain health.
Mineral-Rich: These nuts are a source of important minerals such as potassium, which regulates blood pressure; calcium, essential for bone health; and magnesium, necessary for over 300 biochemical reactions in the body.
High in Fiber: With a high fiber content, acorns can aid in digestion, helping to prevent constipation and promoting a healthy gut. Fiber is also key for maintaining a healthy weight and lowering the risk of heart disease.
Antioxidant Properties: Acorns contain antioxidants that help combat oxidative stress and may reduce inflammation, lowering the risk of chronic diseases like heart disease, diabetes, and cancer.
Heart Health: The unsaturated fats in acorns can contribute to a healthy heart by lowering bad cholesterol levels and potentially reducing the risk of heart disease.
Gluten-Free Alternative: Acorn flour offers a gluten-free alternative for baking and cooking, making it an excellent option for those with gluten sensitivities or celiac disease.
Energy Boosting: Being energy-dense, acorns can provide a sustained release of energy, making them an excellent addition to an active lifestyle.
Sustainable Food Source: Foraging for acorns encourages a connection with nature and promotes a sustainable approach to food, reducing reliance on processed and imported goods.
Cultural and Historical Significance: Incorporating acorns into modern diets honors the traditions of many indigenous and ancient cultures for whom acorns were a staple food, fostering a deeper appreciation for our natural world and its history.
Versatile Culinary Uses: From flours to oils, acorns offer a versatile base for a variety of culinary creations, enabling the exploration of new flavors and textures in cooking and baking.
Economic Advantage: Foraging acorns can offer economic benefits, reducing grocery bills and fostering self-sufficiency.
Weight Management: The combination of fiber, healthy fats, and protein in acorns can help in feeling fuller longer, aiding in weight management efforts.
The benefits of acorns extend far beyond their nutritional value, encompassing environmental sustainability, economic savings, and a reconnection with nature’s rhythms. As we turn to the practical aspects of harvesting and preparing acorns, we embark on a journey not just to rediscover an ancient food source but to embrace a lifestyle that values the bounty nature provides. Stay tuned for the next segment, where we will explore how to unlock the edible potential of acorns, ensuring they can be enjoyed safely and deliciously.
Harvesting and Selecting Acorns
The first step in utilizing acorns is gathering them, a task best undertaken in the early autumn when they are ripe and plentiful. Look for acorns that are firm, without any holes or cracks, as these imperfections may indicate the presence of insects or rot. Green acorns are immature and should be left to ripen, while those that are brown and detach easily from their caps are ready for use. It’s a sustainable practice to gather from the ground, leaving enough acorns for wildlife and the regeneration of the oak forest.
Processing Acorns to Remove Tannins
Shelling: Begin by removing the acorns from their shells. This can be done manually or with the aid of a nutcracker. It’s a labor-intensive step but crucial for accessing the nut meat within.
Leaching Out the Tannins: The most critical step in making acorns edible is leaching out the tannins, which are compounds that give raw acorns their bitter taste and can be harmful in large quantities. There are two primary methods for leaching: cold and hot leaching.
Cold Leaching: This method involves soaking the shelled acorns in cold water. The water should be changed when it becomes discolored, approximately every 12 to 24 hours, until the water remains clear, indicating that the tannins have been removed. This process can take several days to a week, depending on the acorn variety.
Hot Leaching: Hot leaching is faster than cold leaching but requires more active management. Boil the acorns in water, and change the water when it turns dark, repeating this process until the water remains mostly clear. This method can remove the tannins in a matter of hours.
Drying: After leaching, the acorns need to be dried to prevent mold and prepare them for grinding. Spread the acorns on a baking sheet and dry them in an oven at a low temperature, in a dehydrator, or air-dry them in a sunny, well-ventilated area.
Making Acorn Flour
Once dried, the acorns can be ground into flour using a food processor, blender, or hand grinder. The resulting flour should be stored in an airtight container in a cool, dry place or frozen for extended storage. Acorn flour can be used as a substitute for traditional flours in baking, offering a nutty flavor and nutritional boost to bread, pancakes, and other baked goods.
Incorporating acorns into our diets is a journey back to the roots of human sustenance, a nod to the wisdom of our ancestors who relied on the natural world for their dietary needs. This journey is not just about adding a new ingredient to our pantry but about embracing a deeper connection with nature, understanding the cycles of growth and renewal, and appreciating the abundance that surrounds us. As we integrate acorns into our meals, we partake in a tradition that spans centuries and cultures, celebrating the oak tree’s gift and its enduring significance to both the environment and our health. Let the humble acorn inspire you to explore, innovate, and appreciate the simple, yet profound, pleasures of foraging and feasting from the land.
