California on Alert: Anaplasmosis Cases Skyrocket, Raising Public Health Concerns
LOS ANGELES, CA – A concerning surge in Anaplasmosis, a bacterial disease transmitted by black-legged ticks, is sweeping across California, prompting urgent warnings from veterinary and medical experts. New data reveals a significant increase in infections among dogs, serving as a critical indicator of a growing risk to human health. This is breaking news that demands attention, especially as climate change exacerbates the spread of this potentially serious illness.
Tick-Borne Threat: The Numbers Tell a Worrying Story
Analysis of 59,215 dogs across the state shows 714 positive cases of Anaplasmosis, demonstrating sustained growth since 2021. In Los Angeles County alone, the percentage of dogs testing positive for the disease has doubled in the last five years, rising from 0.5% to 1.21% in 2024. While these figures represent canine infections, experts emphasize that dogs are often the “canary in the coal mine” – more frequently exposed to ticks and routinely tested, making their infection rates a strong predictor of human risk.
Beyond the Bite: Understanding Anaplasmosis
Anaplasmosis isn’t a new disease, but its expanding range and increasing prevalence are alarming. Historically concentrated in northern California, the infection is now firmly establishing itself in southern regions like Santa Barbara, San Diego, and even Malibu. This shift is largely attributed to climate change, which allows ticks to survive longer and expand their territory. Urban expansion and habitat modification, reducing natural predator populations, also contribute to the problem.
In dogs, symptoms can include tiredness, weight loss, fever, and joint pain, though many infected dogs show no outward signs. Early detection through regular veterinary testing is crucial, as antibiotics are highly effective in treating the infection. But the story doesn’t end with our furry friends.
Human Health at Risk: Flu-Like Symptoms and Diagnostic Challenges
For humans, Anaplasmosis often mimics the flu, presenting with fever, headache, muscle aches, and fatigue. Symptoms can appear up to 14 days after a tick bite. While most patients respond well to antibiotics, untreated cases can lead to serious complications. However, diagnosis is often delayed or missed entirely. Dr. Sunjya Schweig of the California Functional Medicine Center notes, “It is much more common than we believe. The tests are bad. There are many patients who are not being diagnosed.” Routine testing is rarely offered unless a patient specifically requests it after a tick bite and develops symptoms.
The Business Animal Parasites Council estimates that official case numbers only capture around 30% of actual parasitic activity, suggesting the true incidence of Anaplasmosis is significantly higher. Confirmed and probable cases in humans have already doubled between 2020 and 2021, and remain elevated through 2023.
Preventive Measures: Protecting Yourself and Your Pets
Brad Ryan, a veterinarian with Anso Diagnostics, stresses the importance of year-round preventative measures. “Dog owners must administer preventive medications to their pets against fleas, ticks, and dirophilasis throughout the year.” This includes regularly checking both pets and yourself for ticks after spending time outdoors. Consider treating clothing and gear with permethrin, and creating a tick-safe zone around your home by clearing brush and keeping grass short.
The Future of Tick-Borne Diseases in California
Experts predict that the trend of “imported” cases – infections contracted during travel to areas with higher prevalence – will continue in southern California, mirroring patterns seen in regions like New England and New York. As Ryan succinctly puts it, “unless its veterinary clinic is located in the middle of the National Park of the Death Valley… There is nothing that can stop the establishment of these western black leg ticks in southern California.” This underscores the need for proactive public health measures, increased awareness, and continued research into effective prevention and treatment strategies. Staying informed and vigilant is now more critical than ever.
For the latest updates on Anaplasmosis and other tick-borne diseases, and to learn more about protecting your family and pets, visit archyde.com. We’re committed to bringing you timely, accurate, and actionable information to help you navigate the evolving landscape of public health.
