Flea-Borne Typhus Cases Surge in Los Angeles

Health officials warn residents to take precautions as the city sees record numbers of the bacterial illness.

Apr. 8, 2026 at 5:36pm

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A highly detailed, translucent X-ray photograph showing the internal structures of a flea, with its legs, abdomen, and other features visible as glowing lines against a dark background, conceptually representing the spread of the flea-borne typhus illness.An X-ray image reveals the intricate anatomy of a flea, the vector for the surge of flea-borne typhus cases in Los Angeles.Los Angeles Today

Los Angeles County is experiencing a significant rise in flea-borne typhus cases, with at least 220 infections reported in 2025 - a 187% increase from the previous year. The bacterial illness, transmitted through infected flea feces, can lead to severe symptoms and often requires hospitalization. Health officials are urging residents to use flea control on pets, avoid stray animals, and keep their homes and yards clean to combat the outbreak.

Why it matters

Flea-borne typhus is a serious public health concern, as nearly 9 out of 10 people infected require hospitalization. The surge in cases highlights the need for increased awareness and preventative measures to protect the community, especially vulnerable populations like the elderly and those with weakened immune systems.

The details

Flea-borne typhus is spread through contact with infected fleas, which can pick up the bacteria by biting infected animals like rats, cats, or opossums. Symptoms can develop within 14 days and include fever, chills, aches, and rash. In more severe cases, it can lead to coughs, digestive issues, and confusion. While the disease can be treated with antibiotics, prompt medical attention is crucial to avoid hospitalization and potential life-threatening complications.

  • In 2025, Los Angeles County recorded at least 220 typhus infections.
  • This represents a 187% increase from the 33 cases reported in 2024.

The players

Los Angeles County Department of Public Health

The local public health agency that is monitoring and responding to the surge in flea-borne typhus cases in the region.

Dr. Aiman Halai

A medical epidemiologist at the Los Angeles County Department of Public Health who is warning residents about the risks and providing guidance on prevention.

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What they’re saying

“These cases have been rising year after year. They're occurring in all areas of our county.”

— Dr. Aiman Halai, Medical Epidemiologist, Los Angeles County Department of Public Health

“Some patients can develop severe illnesses in which multiple organ systems can be involved and really can result in death as well.”

— Dr. Aiman Halai, Medical Epidemiologist, Los Angeles County Department of Public Health

What’s next

Health officials are urging residents to take immediate action to protect themselves and their pets, including using flea control products, avoiding stray animals, keeping trash bins closed, and trimming vegetation around their homes.

The takeaway

The surge in flea-borne typhus cases in Los Angeles highlights the importance of public health vigilance and community-wide efforts to address emerging infectious disease threats. By taking proactive steps to prevent the spread of this illness, residents can help safeguard the health and well-being of the entire community.