Rising Typhus Outbreaks in LA County: How Fleas on Rats, Possums, and Pets Are Putting Your Health at Risk

As summer winds down, Southern Californians face a new challenge: fleas that carry typhus fever. A recent report from the Los Angeles County Health Department warns pet owners to be extra cautious.

Typhus cases have been climbing since 2010, with a record-breaking 187 reported in 2024. This year alone, there have already been 106 cases, showing an alarming increase compared to last year. Health officials expect more cases as we enter the peak season for infections from late summer to fall.

Recent outbreaks have been concentrated in central Los Angeles, with five cases identified in Santa Monica. In comparison, the average number of cases in 2018 was around 60, and since 2020, it’s risen to an average of 143 annually, indicating a worrying trend.

Historically, outbreaks have affected various neighborhoods, including Pomona and Downtown L.A. Typhus is not contagious between people; it spreads solely through infected fleas found on rats and feral animals. A single opossum can carry up to 700 fleas, making outdoor pets susceptible. Fleas can hitch a ride into homes on dogs and cats.

The bacterium causing typhus, Rickettsia Typhi, enters the body through flea bites or even when flea droppings touch broken skin or eyes. Symptoms often mimic other illnesses—fever, headaches, muscle pain, nausea, and rashes—so it’s essential to seek medical help if you experience any of these signs.

Dr. Muntu Davis, the health officer for L.A. County, emphasizes that flea-borne typhus is serious but preventable. “We urge people to use flea control on their pets, avoid stray animals, and make sure wildlife doesn’t invade their properties,” he advises.

In fact, social media trends show increasing concern among residents about flea and rodent control. Many community members are sharing tips online about how to keep homes and pets safe.

To minimize the risk of exposure, here are some practical steps you can take:

• Trim back vegetation around your yard.
• Seal any gaps in your home’s exterior.
• Avoid leaving pet food outside.
• Regularly pick fruit from trees.
• Secure your garbage containers.
• Report stray animals or signs of rodents to local authorities.
• Use flea control medications on pets.

With increased awareness and preventive measures, you can protect yourself and your pets against typhus. For further details on flea-borne typhus, check the LA County Health Department’s page on it here.

Originally published on August 29, 2025.

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