What is tuberculosis and how dangerous is it?

Tuberculosis (TB) is a bacterial infection that primarily attacks the lungs but can affect any part of the body. Without treatment, TB is fatal in about half of cases. Even with modern treatment, TB kills over 1 million people annually. Drug-resistant TB strains make treatment more difficult and dangerous.

How does tuberculosis spread?

TB spreads through the air when a person with active pulmonary TB coughs, sneezes, speaks, or sings, releasing bacteria-containing droplets. You can only get TB from someone with active disease in their lungs or throat. Close, prolonged contact (living or working together) poses the highest risk. You cannot get TB from touching surfaces, sharing food, or brief contact.

What is the difference between latent and active TB?

Latent TB means you're infected with TB bacteria but not sick and can't spread the disease. About 5-10% of people with latent TB develop active TB in their lifetime, especially if their immune system weakens. Active TB causes symptoms and can spread to others. Both conditions are treatable, but active TB requires more intensive, longer treatment.

Is there a vaccine for tuberculosis?

Yes, the BCG (Bacille Calmette-Guérin) vaccine is used in many countries where TB is common. BCG is effective at preventing severe TB in children (TB meningitis) but provides variable protection against pulmonary TB in adults. In the U.S., BCG is not routinely used due to low TB prevalence and variable effectiveness.

What is drug-resistant TB?

Drug-resistant TB occurs when bacteria become resistant to standard TB medications. Multi-drug resistant TB (MDR-TB) doesn't respond to at least isoniazid and rifampin, the two most powerful TB drugs. Extensively drug-resistant TB (XDR-TB) is resistant to even more drugs. These forms require longer treatment (18-24 months) with more toxic, expensive medications and have lower cure rates.

Where is tuberculosis most common?

TB occurs worldwide but is most prevalent in Southeast Asia, Africa, and the Western Pacific. Eight countries account for two-thirds of global TB cases: India, Indonesia, China, Philippines, Pakistan, Nigeria, Bangladesh, and South Africa. Check the live outbreak data above for current TB trends.

Nevada

Tuberculosis in Nevada

Tuberculosis (TB) is a contagious bacterial infection that primarily affects the lungs but can spread to other organs. It remains one of the world's deadliest infectious diseases, second only to COVID-19 in recent years.

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What is Tuberculosis?

Tuberculosis is caused by the bacterium Mycobacterium tuberculosis. In 2022, 10.6 million people fell ill with TB, and 1.3 million died from the disease. One-quarter of the world's population is estimated to be infected with TB bacteria, though most have latent TB (not sick or contagious). TB is curable and preventable, yet it continues to claim lives, particularly in low and middle-income countries.

Symptoms

Persistent cough lasting 3+ weeks
Coughing up blood or mucus
Chest pain when breathing or coughing
Unintentional weight loss
Fatigue and weakness
Fever and night sweats
Chills and loss of appetite

Transmission

TB spreads through airborne particles when a person with active pulmonary TB coughs, sneezes, speaks, or sings. Prolonged, close contact with an infected person increases transmission risk. TB is not spread by touching, sharing food, or brief contact. Poor ventilation increases transmission risk.

Contagious Period: People with active pulmonary TB can be contagious until treated for 2-3 weeks; latent TB is not contagious

Prevention

Early diagnosis and treatment of active TB cases
Treatment of latent TB infection to prevent progression
BCG vaccination in high-burden countries (protects children)
Good ventilation in indoor spaces
Respiratory hygiene (covering mouth when coughing)
Isolation of infectious TB patients until no longer contagious
Regular screening for high-risk populations
UV light or air filtration in healthcare settings

Nevada Health Resources

Local health department information and state-specific prevention guidance

We're Monitoring Nevada

Our AI-powered surveillance continuously monitors Tuberculosis activity across Nevada. We track data from state health departments, local hospitals, CDC reports, and 50+ global health sources to provide early warning of emerging threats.

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Nevada Health Department

For official state health alerts, vaccination locations, and public health guidance specific to Nevada, visit your state health department's website.

→ Nevada Department of Health → CDC Tuberculosis Information → CDC Health Topics

Understanding Tuberculosis: Key Questions

Whether you live in Nevada or are traveling there, knowing the symptoms, timeline, and when to seek care helps you act quickly if exposure occurs.

When to Seek Care

Seek care if you experience severe dehydration, bloody stools, high fever, or symptoms lasting more than 3 days. Children under 5, adults over 65, and immunocompromised individuals should seek care earlier.

Emergency symptoms: Severe dehydration, inability to keep fluids down for 12 or more hours, or neurological symptoms require emergency care.

Expert Resources & References

Trusted information from leading health organizations

CDC

Official guidance from the U.S. Centers for Disease Control and Prevention

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WHO

Global disease surveillance and guidelines from the World Health Organization

View WHO Resources →

Research

Latest peer-reviewed research and clinical studies

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Medically Reviewed Content

Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.

Last reviewed: 2026-09-01

Recent Tuberculosis Reports

No confirmed cases reported in Nevada yet. Here are the latest Tuberculosis reports from our global surveillance network.

India stands at the crossroads of two epidemics, diabetes and tuberculosis (TB), the former fuelling vulnerabilities to the latter. The recently released National Family Health Survey-6 (NHFS-6) shows the share of Indian adults with high blood sugar has risen sharply, from about …

United States · Alaska · 2026-08-28

Patna, Aug 20 (PTI) More than 87,600 tuberculosis (TB) cases were detected in Bihar during an intensive statewide screening campaign conducted between July 2 and August 14, a senior health official said on Thursday. According to state health department data, officials screened 2…

United States · Alaska · 2026-08-26

Matthew Ablon is a digital content producer for CBS Texas and the South region. Dallas County Health and Human Services has launched an investigation into a possible tuberculosis (TB) exposure at MacArthur High School in Irving, saying it may have happened during the previous sc…

United States · Alaska · 2026-08-18

Make this your preferred source to get more updates from this publisher on Google. Health advocates and health workers on Wednesday asked the Ombudsman to dismiss Health Secretary Jose "Brix" Pujalte Jr. over alleged whimsical suspension of procurement of tuberculosis drugs and …

Philippines · 2026-08-06

DENVER (KDVR) - Public advocates are urging the state to take more action after health officials continue to be denied access to an ICE detention center to investigate a potential tuberculosis outbreak. Colorado public health officials say they continue to weigh their options af…

United States · 2026-08-12

Chandigarh: Facing a tuberculosis (TB) burden that exceeds the national average, Punjab govt has decided to deploy dedicated Class-I officers at the block and urban ward levels to spearhead the TB elimination efforts as part of its goal of making Punjab TB-free by 2030 under the …

United States · 2026-07-29

As South Africa grapples with a persistent tuberculosis (TB) epidemic, the Department of Health has expressed optimism about the ongoing development of a new vaccine that could alter the landscape of TB prevention and control, Cape {town} Etc reports. Recent trials of the M72/AS0…

South Africa · 2026-08-03

MANILA, Philippines -- The Philippines and the United States have signed an agreement boosting efforts against the spread of human immunodeficiency virus (HIV) and tuberculosis (TB). In announcing the signing of the five-year Health Strategic Objective Agreement, the US embassy d…

Philippines · 2026-08-02

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Frequently Asked Questions

Common questions about Tuberculosis answered by our epidemiology team

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