Health authorities in Maine have confirmed three active cases of tuberculosis (TB), the world’s deadliest infectious disease, prompting urgent screening efforts across the Portland area.

No Connection Between Patients

According to the Maine Center for Disease Control and Prevention, the three patients live in the Portland area but have no genetic link to one another, suggesting they were infected from different sources rather than through direct transmission. Officials are now working to trace and screen anyone who may have come into contact with the patients.

A Global Killer

Tuberculosis, caused by the bacterium Mycobacterium tuberculosis, primarily attacks the lungs but can also damage the kidneys, spine, and brain. It kills approximately 1.25 million people worldwide each year, making it the leading infectious cause of death, according to the World Health Organization (WHO).

Symptoms include:

• Persistent cough, sometimes producing blood or mucus

• Chest pain

• Fever and night sweats

• Fatigue and unexplained weight loss

If untreated, TB destroys lung and organ tissues, leading to respiratory failure and potentially fatal complications.

Rising Cases in Maine

While TB remains more common in developing countries, Maine has seen a gradual rise in cases. So far in 2023, 28 cases have been reported through July, though officials stress there is currently no outbreak in the state.

In the United States overall, 565 people died of TB in 2022, according to the most recent CDC data.

Containment Efforts Underway

Maine CDC spokesperson Lindsay Hammes confirmed that the three active cases are not genetically connected, easing concerns of a localized outbreak but underscoring the ongoing threat of TB. Public health officials emphasize the importance of early detection, screening, and treatment to prevent further spread.

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✅ Bottom line: Tuberculosis remains a silent but deadly threat—even in developed regions like Maine. While health officials stress there is no outbreak at present, the new cases highlight the importance of vigilance, rapid diagnosis, and consistent global efforts to control this ancient yet persistent disease.