ARIZONA REPORTS FIRST PLAGUE DEATH (SINCE 2007)

What is the News?

• A resident of Coconino County, Arizona, died from pneumonic plague in July 2025.
• This is the 1st death from plague in Arizona since 2007, where the previous case was linked to contact with an infected animal.
• The patient died within the same day of being admitted to Flagstaff Medical Center, despite emergency care.
• Tests confirmed infection with Yersinia pestis, the same bacterium that caused the Black Death in medieval Europe.

WHAT IS PLAGUE?

• Plague is an infectious zoonotic disease caused by the bacterium Yersinia pestis.
• It mainly affects rodents, small mammals, and their fleas, but can be transmitted to humans.
• Historically called the “Black Death”, it was responsible for the death of over 50 million people in 14th-century Europe — nearly one-third to half of the continent's population.
• In modern times, plague is rare, treatable, and monitored by public health systems.

FORMS OF PLAGUE

WHAT IS PNEUMONIC PLAGUE?

• Pneumonic plague is a severe lung infection caused by Yersinia pestis.
• It can:
  • Develop when bubonic/septicemic plague goes untreated.
  • Be directly inhaled via respiratory droplets from an infected person/animal.
• Highly contagious and often fatal if not treated within 24 hours.
• Requires urgent antibiotic therapy and isolation of the patient to prevent spread.

• The disease is rare in modern times but considered a potential public health emergency.
• Countries like the UK, as of 2025, report very low to negligible risk of outbreaks due to improved hygiene, medical infrastructure, and surveillance.

PUBLIC HEALTH RESPONSE & PREVENTION

Prevention Strategies:

• Avoid contact with dead or wild animals.
• Use DEET-based insect repellents to prevent flea bites.
• Wear gloves when handling potentially infected animals/tissues.
• Avoid contact with symptomatic individuals in outbreak areas.
• Surveillance and prompt reporting of symptoms in plague-prone zones.

Arizona Public Health Measures:

• Contact tracing and health checks for those exposed.
• Increased flea and rodent surveillance.
• Public advisories on avoiding wildlife and dead animals.

IS PLAGUE STILL A GLOBAL THREAT?

• While largely eradicated in developed countries, sporadic outbreaks still occur globally:
  • Madagascar (2017): over 2,000 cases, including pneumonic plague.
  • Congo, Peru, Mongolia, and parts of the U.S. (Southwest) report occasional zoonotic outbreaks
• Climate change and human encroachment into wildlife habitats may increase the risk of zoonotic spillovers.
• WHO lists plague under "re-emerging infectious diseases" that need constant surveillance.