Overview

Los Angeles County is currently facing an alarming rise in cases of flea-borne typhus, a bacterial disease transmitted by infected fleas. The situation is serious, with nearly 90% of those infected requiring hospitalization. Health officials are emphasizing that the risk extends to all residents, regardless of pet ownership.

Dr. Aiman Halai, a Medical Epidemiologist with the Los Angeles County Department of Public Health, noted that the incidence of typhus has been increasing annually across the county. Symptoms can range from mild to severe, and in some cases, can lead to death.

Key details

  • Los Angeles County is experiencing a record number of flea-borne typhus cases.
  • Approximately 90% of patients diagnosed with typhus have required hospitalization.
  • Typhus is caused by a bacterial infection spread through flea bites.
  • Symptoms of typhus can include fever, headache, nausea, body aches, vomiting, and rash.
  • Symptoms may appear one to two weeks following a flea bite.
  • In 2025, there were 220 reported cases of typhus in L.A. County, an increase from 187 cases in 2024.
  • Dr. Halai stated that severe cases can affect multiple organ systems and may result in death.
  • The disease is not transmitted from person to person.
  • Infected fleas are commonly found on rats, free-roaming cats, and possums.
  • Pets that spend time outdoors may carry infected fleas without showing signs of illness.
  • Residents are at risk of contracting typhus even if they do not own pets.
  • Health officials are urging the public to be aware of the risks associated with flea bites.

Context

The rise in flea-borne typhus cases in Los Angeles County highlights a public health concern that has been growing over the years. The increasing number of infections calls for heightened awareness and preventive measures among residents.

What happens next

Health officials are likely to continue monitoring the situation closely and may implement educational campaigns to inform the public about the risks of flea-borne typhus and how to prevent infection.

What we don't know yet

Details regarding specific preventive measures being recommended by health officials, as well as the exact locations within the county most affected by the surge, are not confirmed.