Flea-Borne Typhus Outbreak in Los Angeles

A resurgence of flea-borne typhus in Los Angeles has led to the hospitalization of six individuals amid a recent outbreak.

Health authorities are currently examining the outbreak in the Wilshire Center area as this bacterial infection continues to emerge in various parts of LA County.

This new group of cases follows a similar outbreak in Pico-Union earlier this year, where five individuals were also hospitalized.

Officials suspect that fleas are the primary source of exposure in this latest event.

Dr. Jeffrey Klausner, an infectious disease expert at the USC Keck School of Medicine, indicated that anyone who comes into contact with fleas is at risk for infection.

The illness is commonly linked to fleas from rats and other animals, with historical ties to areas facing sanitation challenges. Klausner noted that these cases often occur near homeless encampments or locations with inadequate sanitation. Interestingly, pets, especially outdoor cats, can also be at risk of encountering infected fleas.

Flea-borne typhus is a serious bacterial infection caused by Rickettsia typhi. Infection can occur when flea feces enter the body through broken skin or are inadvertently rubbed into the eyes. Symptoms typically appear within one to two weeks and include fever, headaches, vomiting, rashes, muscle aches, and general body discomfort.

Crucially, this disease does not spread from person to person and can usually be treated with antibiotics if diagnosed early enough.

The situation in Wilshire Center is particularly alarming as LA County has seen a notable increase in flea-borne typhus cases over the years. A record 220 cases were recorded in 2025, a rise from 187 the previous year, with a striking nine out of ten affected individuals requiring hospitalization. Additionally, 109 cases have already been reported this year.

Health officials have urged residents to maintain year-round flea control for their pets, avoid contact with stray or wild animals, and take measures to keep their homes free from rodents and other wildlife that may carry fleas.