San Luis Obispo dentist dies after two-month West Nile virus battle

Key points

• Dr. Michael Colleran died on Oct. 25, 2026, at age 63 after being diagnosed with West Nile virus.
• He was one of 29 people to die of West Nile virus in California in 2026, according to the California Department of Public Health.
• Colleran’s symptoms began with flu-like symptoms and progressed to neurological issues resembling a stroke.
• He was hospitalized at Santa Barbara Cottage Hospital and later moved to a long-term care facility in West Covina.
• His dental practice in San Luis Obispo is up for sale, and a GoFundMe has been launched to help his family with medical bills and loans from a 2024 arson fire.

Background

California has experienced a five-year high in West Nile virus activity this summer, with 502 people testing positive statewide. Southern California, particularly Los Angeles and Orange counties, has seen the most severe outbreaks, driven by record heat and humidity. San Luis Obispo County reported only one case this year, but health officials urge residents to take precautions against mosquito bites.

Why it matters

The death of Dr. Colleran highlights the severe risks of West Nile virus, especially for older adults and those with underlying health conditions. It also underscores the financial strain that such illnesses can place on families, particularly when compounded by other crises like the arson fire that damaged his practice.

What to watch

The Colleran family will host a celebration of life for Dr. Colleran on Nov. 14 at the Church of Jesus Christ of Latter-day Saints in Atascadero. The family is also seeking donations through a GoFundMe to help cover medical bills and business loans.