California health officials are warning residents to take preventive measures following a record surge of flea‑borne typhus cases in Los Angeles County, where 220 infections were reported in 2025—the highest number ever recorded locally, according to SF Gate—with around 90 precent of those infected, requiring hospitalization.
Officials confirmed that cases were reported countywide, with localized outbreaks identified in Santa Monica, Willowbrook and parts of central Los Angeles, according to the Los Angeles County Department of Public Health, reported by Fox News 11.
What Is Flea-Borne Typhus?
SF Gate reports that flea‑borne typhus is caused by the Rickettsia typhi bacteria and spreads to humans through infected fleas. These fleas are most commonly carried by stray animals, rodents, free‑roaming cats and opossums. Infection typically occurs because after the flea has bitten the human, it defecates. Its feces can then enter the bloodstream if the victim scratches the bite.
What Are The Symptoms of Flea-Borne Typhus?
Symptoms generally appear one to two weeks after being bitten and may include a high fever, headache, body aches, nausea, and a rash. While typhus is treatable with antibiotics, delayed diagnosis can lead to severe illness and complications.
Why Cases Are Rising
Health experts reported by SF Gate and Fox News believe the rise in cases is down to several factors, including increased human contact with wildlife, urban environments that attract rodents, and favorable (warm) conditions for flea populations.
Fleas can hitch rides indoors on pets, exposing people in and around their homes—often without any obvious warning signs, as infected animals don’t often show any symptoms.
Los Angeles County health officials say the upward trend marks a continuation from previous years, with 187 cases reported in 2024, suggesting the surge is not an isolated event but part of a broader, sustained increase.
Who Is Most at Risk?
Cases in 2025 affected people across all age groups, highlighting that the risk is not limited to the elderly or immunocompromised. Officials stress that anyone exposed to fleas or wildlife—particularly those living in areas with known rodent activity—may be vulnerable.
Although deaths from flea‑borne typhus are rare, the high hospitalization rate suggests many infections become serious before treatment begins, raising concerns about early recognition and prevention.
How Californians Can Protect Themselves
Residents are urged to take simple preventive steps to reduce their exposure. These include using flea control products on pets year‑round, avoiding contact with stray animals, and securing trash and yard areas to deter wildlife.
Residents are also advised to block entry points that could allow rodents or opossums into homes.
Anyone experiencing symptoms consistent with typhus—especially following possible flea exposure—is advised to seek medical care quickly, as early antibiotic treatment is highly effective.
