Key keywords: flea-borne typhus, public health alert, 90% typhus hospitalization rate, Rickettsia typhi, flea disease prevention, typhus symptom identification, zoonotic infectious disease, urban rodent control Local and federal public health officials across the U.S. Southwest have issued an urgent public alert over a surging outbreak of flea-borne typhus, a bacterial infection spread by infected fleas that has led to hospitalization for 90% of confirmed cases reported so far this year. Caused by the Rickettsia typhi bacteria, flea-borne typhus spreads to humans primarily through bites from infected fleas, or when people come into contact with flea feces that enter the body through broken skin, the eyes, or the respiratory tract. Common reservoir hosts for the disease include wild rodents, stray cats, opossums, and other urban wildlife that carry fleas, making dense urban areas with unaddressed rodent infestations the highest-risk zones for transmission. Early symptoms of the infection mirror many common viral illnesses, including sudden high fever, severe headache, body aches, chills, nausea, and a mild rash that appears 3 to 5 days after onset. This similarity to flu, COVID-19, and dengue often leads to delayed diagnosis, which health officials say is the primary driver of the extremely high hospitalization rate. When left untreated for more than 3 to 4 days, the infection can cause severe complications including liver and kidney damage, pneumonia, inflammation of the heart or brain, and in rare cases, death. Data from the Centers for Disease Control and Prevention (CDC) shows that confirmed flea-borne typhus cases across California, Arizona, and New Mexico have risen 127% compared to the same period last year, with 212 confirmed cases recorded as of mid-July. Of those cases, 191 required inpatient care, matching the 90% hospitalization rate cited in the official warning. Public health teams are rolling out targeted outreach campaigns across high-risk neighborhoods, including free flea prevention kits for pet owners, educational flyers for unhoused populations, and coordinated rodent control efforts with local municipal authorities. Officials are urging residents to take basic preventive steps: administer monthly flea prevention medication to all household cats and dogs, seal off entry points for rodents in homes and yards, avoid contact with stray or wild animals, wear long sleeves and pants when visiting areas with known rodent activity, and seek medical care immediately if they develop unexplained fever paired with potential exposure to fleas. Doctors emphasize that flea-borne typhus is easily treatable with the common antibiotic doxycycline if administered within the first 72 hours of symptom onset, and most patients who receive early treatment make a full recovery within 2 weeks.