Tuberculosis

What is Tuberculosis (TB)?
Tuberculosis is a potentially life-threatening infectious disease that primarily attacks your lungs, though it can spread to almost any part of the body. It is caused by a slow-growing bacterium called Mycobacterium tuberculosis.

How it Spreads: TB is an airborne disease. It spreads when someone with an active infection coughs, sneezes, or talks, releasing microscopic droplets into the air. It is not spread by shaking hands, sharing food, or touching surfaces.

The Two Forms of TB

Your body's immune system can often "wall off" TB bacteria, keeping them dormant for years. Understanding the difference between these two stages is vital for treatment:

Latent TB (Inactive)	Active TB (Disease)
The bacteria are "asleep" in the body. You feel healthy and have no symptoms. You are NOT contagious. Requires treatment to prevent it from "waking up" later.	The bacteria are actively multiplying and attacking tissue. You feel sick and display physical symptoms. You CAN spread the infection to others. Requires immediate, aggressive medical treatment.

Symptoms of Active TB

While TB most commonly resides in the lungs, it can also target the kidneys, spine, or brain. When symptoms appear in the lungs, they usually include:

• A Persistent Cough: Lasting 3 weeks or longer.
• Hemoptysis: Coughing up blood or dark-colored sputum (phlegm).
• Chest Pain: Sharp pain while breathing or coughing.
• Systemic Symptoms: Fever, chills, and drenching night sweats.
• Weight Loss: Significant, unintentional weight loss and loss of appetite.

When to See a Doctor

Schedule an appointment immediately if you have a fever, unexplained weight loss, or a cough that has lasted longer than three weeks. If you believe you have been exposed to someone with active TB, you should be tested even if you feel perfectly healthy; treating the infection in its latent (inactive) stage is much easier than treating active TB.

🛑 CRITICAL WARNING: MDR-TB
You must finish your entire course of medication.

TB treatment is a marathon, lasting 6 to 9 months. You will likely feel significantly better after just a few weeks, but many bacteria are still alive in your system. If you stop taking the pills prematurely, the surviving bacteria mutate and become Multi-Drug Resistant TB (MDR-TB). This "super-strain" is incredibly difficult to treat, often fatal, and a major threat to public health.

Risk Factors

• Weakened Immune Systems: HIV/AIDS is the highest risk factor, as it prevents the body from keeping TB bacteria in a latent state.
• Crowded Environments: Working or living in prisons, homeless shelters, or nursing homes with poor ventilation increases the risk of inhaling airborne droplets.
• Geography: Living in or traveling to regions with high TB rates, including parts of Africa, Asia, and Eastern Europe.

Diagnosis

Because TB can hide in the body, doctors use multiple tools to confirm a diagnosis:

• Skin Test (Mantoux): Tuberculin fluid is injected under the skin. A raised, hard red bump after 48-72 hours indicates your body has encountered the bacteria.
• Blood Test (IGRA): A more modern and accurate test that measures how your immune system reacts to TB bacteria; it is not affected by the BCG vaccine.
• Chest X-Ray: Used if a skin or blood test is positive to look for white spots or cavities in the lungs.
• Sputum Testing: Analyzing the mucus you cough up to see which specific antibiotics will kill your strain of TB.

Treatment & DOT

TB is treated with a specific combination of antibiotics taken over several months. The core four medications are typically:

• Isoniazid (INH)
• Rifampin (Rifadin)
• Ethambutol (Myambutol)
• Pyrazinamide

What is DOT?

Directly Observed Therapy (DOT) is the clinical gold standard. Because the risk of drug resistance is so high, a healthcare worker or trained professional meets with the patient daily to provide the medication and watch them swallow it. This ensures 100% compliance and protects the community from MDR-TB.

Frequently Asked Questions (FAQs)

Can you get TB from a toilet seat or sharing a drink?

No. TB is strictly airborne. The bacteria do not survive well on surfaces. You cannot get TB through contact with clothes, drinking glasses, eating utensils, or bathroom surfaces. It requires breathing in the air that someone with an active infection has just coughed or sneezed into.

Does the BCG vaccine protect you for life?

Not necessarily. The BCG vaccine is very effective at protecting young children against severe forms of TB (like TB meningitis), but its effectiveness in preventing adult lung TB varies significantly. This is why people who have had the vaccine are still routinely tested for TB.

References

• World Health Organization (WHO) - Tuberculosis Fact Sheet
• Centers for Disease Control and Prevention (CDC) - TB Symptoms & Signs
• Mayo Clinic - Tuberculosis Diagnosis & Treatment