Flea-Borne Typhus Cases Surge in Los Angeles County, Hospitalizations High
Los Angeles County is experiencing a significant rise in flea-borne typhus cases, with a striking 90% of affected patients requiring hospitalization. The infections are noted to be increasing across all areas of the county. In 2025, the county documented 220 typhus infections, marking an increase from 187 cases recorded in 2024.
Approximately 90% of affected patients requiring hospitalization underscores the severity of the recent surge.
Overview of Flea-Borne Typhus
Typhus is a bacterial illness transmitted by infected fleas. Symptoms can range from mild to severe and typically manifest one to two weeks after a flea bite. These symptoms often include:
- Fever
- Headache
- Nausea
- Body aches
- Vomiting
- Rash
In severe cases, the disease can affect multiple organ systems and may lead to death. Crucially, the Los Angeles County Department of Public Health indicates that typhus is not transmitted between humans.
High Hospitalization Rate and Undercounted Cases
Medical Epidemiologist Dr. Aiman Halai, with the Los Angeles County Department of Public Health, stated that 90% of individuals bitten by contaminated fleas were hospitalized. While severe cases are generally documented, health officials believe that numerous milder cases may occur and remain uncounted.
Health officials believe that numerous milder cases may occur and remain uncounted, suggesting the true incidence could be higher.
Transmission and Key Risk Factors
Infected fleas are commonly found on wild animals such as rats, free-roaming cats, and possums. Domestic pets that spend time outdoors can also carry infected fleas into homes without exhibiting signs of illness, thereby posing a risk to household members. Health officials emphasize that the risk of infection is present regardless of pet ownership.
Recommended Prevention Measures
To significantly mitigate the risk of flea-borne typhus, health officials advise implementing the following preventive actions:
- Utilize year-round flea control for pets.
- Avoid contact with stray animals; do not handle or feed them.
- Secure outdoor pet food to prevent attracting wild animals.
- Maintain trimmed vegetation around homes.
- Eliminate bulky items or crawl spaces that could serve as hiding spots for rodents and other animals.
- Ensure outdoor trash bins are securely sealed.
Treatment and Recent Outbreaks
Flea-borne typhus generally responds to prompt antibiotic treatment, such as doxycycline, which helps prevent severe complications. In the past year, county investigators identified and examined three local outbreaks in Central L.A., Santa Monica, and the unincorporated area of Willowbrook.