Difference Between Primary and Secondary Tuberculosis

Secondary tuberculosis is usually due to the reactivation of old lesions or gradual progression of primary tuberculosis into chronic form. However, recent evidence suggests that reinfection is responsible for some of the secondary tuberculosis.

What is the primary tuberculosis?

Primary TB is defined as infection occurring in previously uninfected host ○ Primary infection is usually asymptomatic and leads to formation of Ghon complex (apical nodule with calcification) and hilar lymphadenopathy.

Is post primary TB the same as secondary TB?

Post primary, also known as adult type or secondary, tuberculosis, in contrast, occurs in people who have developed immunity to primary tuberculosis 10–12. It differs from primary tuberculosis in the genes that modulate susceptibility, clinical presentation, complications and age distribution of hosts 13.

What are the two types of tuberculosis?

There are two types of TB conditions: TB disease and latent TB infection. But, if their TB germs become active, they can develop .

Is primary TB latent?

After an initial infection, the bacteria that causes TB often becomes dormant in the body. But if left untreated, it can become active and infectious. After an initial infection, the bacteria that causes TB often becomes dormant in the body. But if left untreated, it can become active and infectious.

What are the 3 types of tuberculosis?

Tuberculosis is a bacterial infection that usually infects the lungs. It may also affect the kidneys, spine, and brain. Being infected with the TB bacterium is not the same as having active tuberculosis disease. There are 3 stages of TB—exposure, latent, and active disease.

Is primary complex and tuberculosis the same?

The most common form of pediatric TB, the classical primary complex consists of a focal parenchymal lesion typically in mid-lower zones with enlarged draining hilar/paratracheal node. Other presentations of primary TB include miliary TB[7], exudative pleuritis and tracheo-bronchial TB[8,9].

How is primary tuberculosis identified?

The Mantoux tuberculin skin test (TST) or the TB blood test can be used to test for M. tuberculosis infection. Additional tests are required to confirm TB disease. The Mantoux tuberculin skin test is performed by injecting a small amount of fluid called tuberculin into the skin in the lower part of the arm.

How does primary TB spread?

TB bacteria are spread through the air from one person to another. The TB bacteria are put into the air when a person with TB disease of the lungs or throat coughs, speaks, or sings. People nearby may breathe in these bacteria and become infected.

What is the most common extrapulmonary site of TB?

Lymph node TB

This is the most common form of extrapulmonary TB. TB bacilli often infect the lymph nodes in the neck and above the clavicles (the thin bone underneath the shoulders), which then swell and inflame the surrounding skin.

What causes secondary TB?

Secondary tuberculosis usually occurs because of reactivation of latent tuberculosis infection. The lesions of secondary tuberculosis are in the lung apices. A smaller proportion of people who develop secondary tuberculosis do so after getting infected a second time (re-infection).

What is extrapulmonary TB?

Extrapulmonary TB (EPTB) is TB outside the lungs. EPTB includes lymphadenitis (often cervical), pleuritis, meningitis, abdominal TB including peritonitis, skeletal TB such as Pott disease (spine), and genitourinary (renal) TB.

What are the 4 stages of TB?

TB infection happens in 4 stages: the initial macrophage response, the growth stage, the immune control stage, and the lung cavitation stage. These four stages happen over roughly one month.

What is the difference between pulmonary and extrapulmonary tuberculosis?

Tuberculosis (TB) is an infectious disease that typically affects the lungs, though it can also involve other body parts. When it affects the lungs, it’s called pulmonary TB. TB outside of the lung is called extrapulmonary TB.

What is the difference between tuberculosis and pulmonary tuberculosis?

The bacterium Mycobacterium tuberculosis causes tuberculosis (TB), a contagious, airborne infection that destroys body tissue. Pulmonary TB occurs when M. tuberculosis primarily attacks the lungs. However, it can spread from there to other organs.

What is the difference between latent and active TB?

People with latent TB do not have any symptoms and cannot spread TB. If they do not get treatment, however, they may develop active TB disease in the future, spread the disease to others, and feel quite ill. People with active TB disease can be treated and cured if they get medical help.

What is the difference between tuberculosis infection and tuberculosis disease?

There is a difference between TB infection and TB disease. When a person has been exposed to someone with TB disease and has breathed in the TB germs, that person may become infected with TB. In most cases, people with healthy immune systems can contain the infection at that point and not become ill with TB disease.

How many types of tuberculosis are there?

What are the different types of TB? There are two different types, latent TB and active TB disease.

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