Homeless, Food Vendors, Rats bring Fleas and suddenly LA County Has Typhus

LOS ANGELES - Flea-borne typhus is no longer a rare footnote in Los Angeles County. Public health officials have recorded a multi-year climb in cases, a record 220 infections in 2025, and 109 cases so far in 2026, including two localized outbreaks this year.

The latest cluster, announced Sept. 22, involved seven symptomatic cases in the Wilshire Center neighborhood. Six people were hospitalized. All recovered. It was the county's second outbreak of the year after a five-case cluster in Pico-Union. Officials say cases occur countywide and among people in a range of housing situations, though recent clusters have concentrated in central and south Los Angeles.

The disease is murine typhus, caused by the bacterium Rickettsia typhi. It is not spread person to person. People become infected when feces from infected fleas are rubbed into a cut, a scrape, or the eyes. In Los Angeles County the animals most often carrying those fleas are rats, free-roaming cats, and opossums. Outdoor pets can also bring fleas indoors.

County Health Officer Muntu Davis said the rise makes it "more important than ever" to limit contact with fleas on free-roaming animals and wildlife. Nearly 9 in 10 identified patients in 2025 required hospitalization. Deaths remain uncommon, though the county recorded its first typhus fatalities since 1993 in 2022.

What officials say is feeding the cycle

Health officials do not describe typhus as a disease that homeless people transmit to others. They do describe environmental conditions that help rodents and other hosts thrive: unsecured trash, leftover food, illegal dumping, overgrown vegetation, free-roaming animals, and homeless encampments.

A April 2026 Board of Supervisors motion listed those conditions explicitly and directed departments to keep streets and sidewalks clear of trash, garbage, fecal material, pet droppings, and other food sources; add waste bins; trim vegetation; and prioritize sanitation in encampments in outbreak areas. People living outdoors face higher exposure because they spend more time near rodents, stray animals, and accumulated waste. Past downtown clusters included a substantial share of unsheltered patients.

Food left on sidewalks is part of that picture. Street vendors, restaurants, dumpsters, illegal dumping, and encampments all generate food waste that can support rat populations. Rats remain a classic urban reservoir. Officials also emphasize that much of the county's current transmission involves the suburban cycle of cats, opossums, and cat fleas, not only downtown rats.

Not a new disease, but a worsening one

Flea-borne typhus has been rising in the county since about 2010. Counts moved from 141 cases in 2021 to 171 in 2022, dipped to 124 in 2023, then jumped to 187 in 2024 and 220 in 2025. Patients in 2025 ranged from age 1 to 85. Cases occur year-round and typically peak in late summer and fall, when flea activity is higher.

Public Health's prevention list is basic and repeated: year-round flea control on pets, keep pets indoors when possible, do not feed or handle stray animals, rodent-proof homes, and store trash and food waste in secured bins away from residences.

The bacterium is treatable with antibiotics, especially if doctors start treatment before lab confirmation. Symptoms - fever, headache, chills, muscle aches, sometimes rash - are nonspecific, which is why officials tell clinicians not to wait for test results when typhus is suspected.

The title's chain captures part of the ecology: extra food on sidewalks and unsanitary street conditions help rats; rats and other animals carry fleas; fleas spread typhus. The official record is broader. Cats, opossums, household pets, trash anywhere it accumulates, and the difficulty of controlling urban wildlife all sit in the same cycle. The county's own documents treat sanitation, animal control, and encampment cleanup as linked public-health work, not as a single-cause story.