HIV and Tuberculosis

Tuberculosis, often called TB, is a bacterial infection that most commonly affects the lungs. TB and HIV are closely linked: a weakened immune system makes it easier for TB to take hold or become active, which is why TB screening is a routine part of HIV care.

Why the Connection Matters

Your immune system, powered largely by CD4 cells, is what normally keeps TB bacteria in check, either preventing infection altogether or keeping an existing infection inactive (called latent TB). When HIV weakens the immune system, especially if CD4 counts are low, latent TB is more likely to become active, and new TB infections are more likely to progress quickly.

This connection runs both ways: TB is also more serious for someone with HIV than it would be otherwise, and treating HIV well is itself protective against TB. This is one more reason why starting and staying on antiretroviral therapy matters. A stronger immune system is better able to keep TB inactive.

Screening

Because of this link, TB testing is a standard part of HIV care, typically done through a skin test, a blood test, or both, depending on what's available and appropriate for you. This screening usually happens at diagnosis and may be repeated periodically, especially if your CD4 count is low or you have symptoms.

Latent vs. Active TB

• Latent TB means the bacteria are in your body but inactive. You have no symptoms and can't spread it to others. If you test positive for latent TB, your provider may recommend a preventive course of medication to keep it from becoming active, which is especially important with HIV.

• Active TB means the bacteria are multiplying and causing illness, with symptoms like a persistent cough, fever, night sweats, or unexplained weight loss. Active TB requires prompt treatment with a multi-drug regimen over several months.

Treating TB and HIV Together

If you're diagnosed with active TB while living with HIV, your care team will coordinate both treatments carefully, since:

• TB treatment and HIV treatment both involve multiple medications, and some can interact with each other.

• Timing matters. Your provider will decide the right point to start or adjust ART if you're newly diagnosed with both conditions at once.

• Extra monitoring may be needed early on, since starting treatment for both conditions can occasionally trigger a temporary inflammatory response as your immune system recovers.

This is a well-understood situation for HIV specialists, and coordinated treatment for both TB and HIV is very effective.

Key Takeaways

• A weakened immune system from HIV increases the risk that TB becomes active.

• TB screening is a routine, standard part of HIV care.

• Latent TB can often be treated preventively before it becomes active illness.

• TB and HIV treatment are coordinated carefully when both are present, and outcomes are generally very good with proper care.