Happy One Health Month! If you haven’t heard the term “One Health” before, it is a concept that we in the veterinary and medical communities are incredibly passionate about. Simply put, it is the recognition that the health of people, animals, and our shared environment are all part of one big, interconnected circle.
When you bring your pet in for a check-up, I’m not just looking at a dog or a cat—I’m looking at a member of your household. By protecting them, I am also protecting the health of your children, your elderly relatives, and the community at large.
Let’s dive into why this matters.
The Zoonotic Connection: When Diseases Jump the Species Gap
A zoonotic disease is one that can be transmitted between animals and humans. These are more common than most people realize. In fact, roughly 60% of all human infectious diseases and 75% of emerging infectious diseases come from animals.
The “Stealthy” Intestinal Invaders
We often talk about “worms” and “bugs,” but it’s important to know the specific culprits:
- Roundworms (Toxocara canis): These are extremely common in puppies. The eggs are shed in the stool and can live in your garden soil for years. If a human accidentally ingests these eggs (think of a child playing in a sandbox), the larvae can migrate through the human body—a condition called Visceral Larva Migrans—potentially damaging the liver, lungs, or even the eyes.
- Hookworms (Ancylostoma): These parasites have sharp mouthparts that “hook” into the intestinal lining. Their larvae can penetrate human skin directly (often through bare feet), causing an itchy, red, winding rash known as Cutaneous Larva Migrans.
- Giardia: While often grouped with worms, Giardia is actually a microscopic protozoan (a single-celled organism). It is found in contaminated water and soil. In both pets and humans, it causes significant gastrointestinal upset. Because certain strains can be shared between species, strict hygiene is essential.
A Note on Year-Round Protection: Many people think they can take a “winter break” from heartworm and parasite prevention when the mosquitoes disappear. However, we have been seeing a significant uptick in GI parasites this winter. Most heartworm preventatives also include a monthly dewormer. Many of these parasite eggs are incredibly hearty—they can survive freezing temperatures in the soil for months. By stopping prevention, you leave your pet (and your yard) vulnerable. We strongly recommend year-round protection to keep the parasite burden in our community as low as possible.
Ectoparasites: More Than Just an Itch
Fleas and ticks are biological “vectors,” or delivery systems, for disease:
- Ticks: We are seeing a rise in Lyme Disease (Borrelia burgdorferi), Anaplasmosis, and Ehrlichia. While your dog can’t give you Lyme disease directly, they act as a “sentinel.” If your dog tests positive, it means the ticks in your area are carrying the bacteria, and you are at risk too.
- Fleas: These tiny jumpers can transmit Bartonella, the bacteria responsible for “Cat Scratch Disease.” While fleas don’t like to actually infest people, they are annoying for many reasons.
Vaccines as Public Health Barriers
For certain diseases, the vaccine is actually a wall that protects the human population.
Rabies: The Fatal Threat
Rabies is a virus that attacks the central nervous system. Once clinical signs appear, it is virtually 100% fatal in both animals and humans. Because pets are the most frequent bridge between wildlife (raccoons, bats, skunks) and people, vaccinating your pet is the single most effective way to prevent human rabies deaths.The rabies vaccine is 100% effective!
Leptospirosis: The Puddle Peril
Leptospirosis is a bacterium shed in the urine of wildlife. It thrives in stagnant water and moist soil.
- The Science: Leptospira can enter the body through mucous membranes or even small cuts in the skin.
- The One Health Risk: If a dog contracts “Lepto,” they can suffer from acute kidney and liver failure. Because they shed the bacteria in their urine, owners can be exposed while cleaning up accidents in the house. Vaccinating your dog stops the shedding and breaks the cycle of transmission and makes it less likely for your pet to become fatally ill.
The Raw Food Debate and Salmonella Shedding
Studies consistently show that raw meat diets (including commercially prepared ones) have a high prevalence of contamination with Salmonella, Listeria, and Campylobacter.
The danger isn’t just to the dog; it’s to the household. Even if a dog appears healthy while eating raw food, they can become asymptomatic shedders. They carry these dangerous bacteria in their saliva and stool. If that dog licks the face of a child or an immunocompromised adult, the results can be life-threatening. For a safe home, cooked and balanced is always the medical recommendation.
Antimicrobial Stewardship: Saving the “Big Guns”
You might have noticed that your vet seems more cautious about prescribing antibiotics these days, and maybe even using different ones than in the past. This isn’t because we don’t want to help your pet feel better; it’s because we’re practicing something called antimicrobial stewardship.
The overuse or misuse of antibiotics in both human and veterinary medicine has led to a global crisis: antibiotic resistance. This means that bacteria are evolving and some antibiotics that once worked well are no longer effective. This can make treating infections much harder, and sometimes even impossible, for both animals and humans.
That’s why we:
- Only prescribe antibiotics when necessary: Not all infections are bacterial! Viruses, fungi, or other issues don’t respond to antibiotics.
- Try to use “first-line” antibiotics first: These are generally older, more established drugs that we want to keep working effectively. We reserve newer, more powerful antibiotics for when they are truly needed.
- Encourage you to finish the entire course of medication: Stopping early can leave resistant bacteria behind to multiply.
- Are moving away from certain antibiotics for specific conditions: For example, we’re being much more cautious with drugs like metronidazole (often used for diarrhea) and opting for other treatments that are actually better and won’t disrupt your pets natural microbiome.
The Power of the Culture
You may notice us recommending a Culture and Sensitivity (C&S) test more often for things like:
- Urinary Tract Infections (UTIs): Especially if they keep coming back.
- Skin or Ear Infections: When they don’t resolve with standard cleaners.
- Non-healing Wounds: To see exactly what is growing deep in the tissue.
Why is a culture important? Instead of guessing which antibiotic might work, a culture allows the lab to grow the specific bacteria causing the problem and test it against a panel of antibiotics. This tells us exactly which drug will kill the infection and which ones the bacteria are already resistant to. This “targeted therapy” ensures we aren’t using stronger drugs than necessary, which protects the efficacy of those medicines for everyone. It might feel frustrating when we suggest diagnostics before prescribing an antibiotic, but it’s all part of ensuring we use the right drug, at the right time, for the right duration, to protect both your pet’s health and public health.
The Human-Animal Bond: A Vital Lifeline
Finally, let’s talk about one of the most beautiful aspects of One Health: the human-animal bond. This connection is powerful and transcends socioeconomic status. It’s easy to assume that someone who is less fortunate or experiencing homelessness might not be able to adequately care for a pet. However, we consistently see that for many in these situations, their pet is not just a companion, but a crucial source of comfort, security, and unconditional love.
For someone facing immense challenges, a pet can be a reason to keep going, a protector, and a loyal friend who offers solace in a world that can often feel harsh. Many owners facing hardship go to incredible lengths to care for their pets, often putting their pet’s needs before their own. Organizations are also doing amazing work to provide veterinary care, food, and supplies to pets of the less fortunate, recognizing the profound importance of these relationships. As veterinarians, we see the immense therapeutic value of this bond and believe it’s a fundamental part of well-being for all humans, regardless of their circumstances.
Closing Thoughts
One Health is a reminder that we don’t live in a vacuum. Your choice to give a monthly heartworm pill, to vaccinate for Lepto, or to opt for a culture over a “quick fix” antibiotic ripple outward, affecting the health of your neighbors and the safety of our shared world.