Overview

Flea-borne typhus has seen a significant resurgence in California, particularly in Los Angeles County, where cases have reached an unprecedented level. Public health officials reported a record 220 cases in 2025, highlighting the disease's serious impact on the community.

The disease primarily affects individuals of various ages, with nearly 90% of those infected requiring hospitalization. Symptoms include fever and rash, prompting health officials to emphasize the need for increased awareness and preventive measures.

Key details

  • 220 cases of flea-borne typhus reported in Los Angeles County in 2025.
  • This figure represents an all-time high for the county.
  • Nearly 90% of infected individuals required hospitalization.
  • Infected individuals ranged in age from 1 to 85 years old.
  • Symptoms typically include fever and a rash.
  • Three outbreaks were reported in central Los Angeles, Santa Monica, and Willowbrook.
  • In 2024, there were 187 cases of flea-borne typhus in the county.
  • Flea-borne typhus is caused by the bacteria Rickettsia typhi.
  • The disease is spread by fleas that bite infected animals, including rats, cats, and opossums.
  • Typhus is rarely fatal but can cause significant illness.
  • The disease gained prominence in the U.S. during the 1910s and 1920s.
  • Historically, over 40,000 cases were recorded in California and the South during that time.

Context

The resurgence of flea-borne typhus in Los Angeles County raises concerns about public health and the need for effective prevention strategies. The historical context of the disease's prominence in the early 20th century serves as a reminder of the potential for outbreaks.

What happens next

Public health officials are likely to increase awareness campaigns and preventive measures to combat the spread of flea-borne typhus in the affected areas, aiming to reduce the number of cases and hospitalizations.

What we don't know yet

Details regarding the specific measures being implemented to address the outbreaks and the long-term strategies for prevention are not confirmed.