Tuberculosis is rare in the United States but common worldwide

In the United States, tuberculosis (TB) is uncommon. The Centers for Disease Control and Prevention (CDC) reported roughly 7,000 to 8,000 TB cases per year in recent years, out of a population of over 330 million people. That means your chance of getting TB in any given year is very small — less than 1 in 40,000.

Globally, the picture is very different. The World Health Organization estimates that roughly 10 million people develop TB each year worldwide, and about 1.3 million die from it. TB remains one of the top ten causes of death globally, particularly in low-income countries where access to treatment is limited.

The gap between the US and the rest of the world exists because of treatment availability, housing stability, and healthcare access. Countries with reliable TB treatment programs and the ability to diagnose cases early have far fewer cases. Countries without those resources see TB spread more widely.

Key Takeaways

  • The United States has roughly 7,000 to 8,000 TB cases per year, making it uncommon in the general population.
  • Worldwide, about 10 million people develop TB annually, with the disease concentrated in countries with limited healthcare resources.
  • TB rates in the US have been declining for decades due to treatment programs and infection control measures.
  • Certain groups in the US — including people experiencing homelessness, those in correctional facilities, and immigrants from high-TB countries — have higher TB rates than the general population.

Where TB is most common in the United States

TB cases in the US are not evenly distributed. Some states and cities report far more cases than others. California, Texas, Florida, and New York together account for roughly one-third of all US TB cases, partly because they have larger populations and more immigration from countries where TB is more common.

Within the US, TB is concentrated in specific groups. People who are homeless, people in jails or prisons, people living with HIV, and people who have recently immigrated from countries with high TB rates all have higher TB rates than the general population. Healthcare workers and people living in crowded housing also face higher risk.

Urban areas generally report more TB cases than rural areas, though this partly reflects where testing and diagnosis happen more readily. A case that goes undiagnosed in a rural area does not appear in the statistics.

TB rates have dropped significantly over decades

TB cases in the United States have fallen steadily since the 1980s. In 1985, the US reported about 22,000 TB cases per year. By 2000, that number had dropped to roughly 16,000. The decline has continued, though more slowly in recent years.

This drop happened because of several factors working together: the development of effective antibiotics in the mid-1900s, public health programs that find and treat cases, infection control in hospitals and jails, and improvements in housing and living conditions. Once someone with TB receives treatment, they stop being contagious within about two weeks, which breaks the chain of transmission.

The decline has not been uniform across all groups. Some populations have seen faster drops in TB rates than others, reflecting differences in access to diagnosis and treatment.

Countries with the highest TB burden

Eight countries account for roughly two-thirds of all TB cases worldwide. India, Indonesia, the Philippines, China, Nigeria, Pakistan, Bangladesh, and South Africa together report millions of TB cases each year. In some of these countries, TB rates are hundreds of times higher than in the United States.

In countries like South Africa and some parts of India, TB is still a leading cause of death. The combination of high poverty, crowded living conditions, limited access to diagnosis, and the overlap with HIV infection creates conditions where TB spreads widely and treatment is harder to reach.

Even within high-burden countries, TB is not evenly distributed. Urban slums and rural areas with poor healthcare infrastructure see the most cases.

Drug-resistant TB is a growing concern globally

Standard TB is treated with a combination of four antibiotics taken for six months. Drug-resistant TB (DR-TB) requires longer treatment with more difficult medications and has lower cure rates. Multidrug-resistant TB (MDR-TB) is resistant to at least two of the main drugs. Extensively drug-resistant TB (XDR-TB) is resistant to even more medications.

Globally, roughly 450,000 people develop drug-resistant TB each year, according to the WHO. India, China, and Russia report the most cases. Drug-resistant TB is much rarer in the United States — most US TB cases are still treatable with standard medications — but it does occur, particularly in people who have been treated for TB before or who have been exposed to someone with drug-resistant TB.

Drug-resistant TB spreads the same way as regular TB: through the air when an infected person coughs or sneezes. It is not more contagious, but it is harder and more expensive to treat.

TB in people with HIV is a separate problem

People living with HIV who do not receive treatment have much higher rates of TB. Globally, roughly 1 in 3 people with untreated HIV will develop TB at some point. TB is one of the most common opportunistic infections in people with advanced HIV.

In the United States, the overlap between TB and HIV is smaller because HIV treatment is widely available. However, in countries where HIV treatment is limited, TB and HIV together create a severe public health problem. South Africa, for example, has high rates of both diseases, and the combination makes treatment more complex.

People with HIV who are on effective antiretroviral therapy (ART) have TB rates much closer to the general population, because their immune systems recover enough to fight off TB infection.

What the numbers mean for your risk

If you live in the United States and have no known exposure to TB, your risk of developing TB in any given year is very low. Most people who are exposed to TB do not develop the disease — only about 5 to 10 percent of people infected with TB bacteria ever become sick.

Your risk is higher if you have been in close contact with someone who has active TB, if you have recently immigrated from a country with high TB rates, if you are homeless or incarcerated, if you have HIV, or if you work in healthcare or corrections. If any of these apply to you, TB testing may be worth discussing with a doctor.

TB is preventable and treatable. Knowing whether you have been exposed, and getting tested if you have, is the first step toward staying healthy.

Frequently Asked Questions

Is TB still a major cause of death in the United States?

No. TB causes fewer than 500 deaths per year in the US, out of roughly 2.8 million total deaths. Globally, TB is still a top ten cause of death, but in the US it is rare enough that most people will never encounter it.

Can you catch TB from someone who is being treated?

No. Once someone with TB starts taking antibiotics, they stop being contagious within about two weeks. This is why early diagnosis and treatment are so important for stopping TB spread.

What percentage of people exposed to TB actually get sick?

Only about 5 to 10 percent of people infected with TB bacteria develop active TB disease. The rest carry the infection but never become sick. People with weakened immune systems — including those with HIV, those on certain medications, or those who are very young or very old — are more likely to develop active TB.

Is TB more common now than it was ten years ago?

No. TB cases in the United States have continued to decline over the past decade, though the rate of decline has slowed. Globally, TB cases have also declined, though the absolute number of cases remains very high in low-income countries.

Why is TB so common in some countries and rare in others?

TB spreads more easily in places with poverty, crowded housing, poor nutrition, and limited access to healthcare. Countries with strong TB treatment programs, reliable diagnosis, and the ability to isolate and treat cases quickly have much lower rates. The difference is not about the disease itself, but about the conditions that allow it to spread.