difference between primary and secondary tuberculosis, check these out | What is secondary tuberculosis?

Primary and secondary TB are also thought to have characteristic radiographic and clinical features: primary TB is said to be characterized by lower-lobe disease, adenopathy, and pleural effusions, and termed atypical, whereas secondary, or reactivation, TB is associated with upper lobe disease and cavitation, termed …

What is 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 tuberculosis latent?

Risk factors for tuberculosis

M. tuberculosis remains dormant within the host and may be reactivated once the immune system becomes compromised (e.g., by high doses of glucocorticoids or chemotherapeutic agents, HIV infection).

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.

What causes secondary tuberculosis?

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).

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 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?

Lymphadenitis is the most commonly occurring form of extrapulmonary tuberculosis. Cervical adenopathy is most common, but inguinal, axillary, mesenteric, mediastinal, and intramammary involvement all have been described.

Why secondary TB occurs in upper lobe?

Recurrent tuberculosis (reinfection and postprimary tuberculosis due to reactivation) predominantly involves the apical and posterior segments of the upper lobes and the superior segments of the lower lobes because of the relatively higher oxygen tension and delayed lymphatic drainage in these areas.

What is extrapulmonary TB?

Extrapulmonary tuberculosis (EPTB) is tuberculosis outside of the lungs. EPTB includes tuberculosis meningitis, abdominal tuberculosis (usually with ascites), skeletal tuberculosis, Pott’s disease (spine), scrofula (lymphadenitis), and genitourinary (renal) tuberculosis.

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?

A person who has been exposed to TB bacteria may become infected. A person with latent TB infection (LTBI) cannot spread the bacteria to others right away. Only those who develop active TB disease can spread the bacteria to others.

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.

What is the difference between primary and secondary drug resistance?

Person- to-person transmission of drug-resistant organisms causes primary resistance. Secondary resistance develops during TB treatment, either because the patient was not treated with an appropriate regimen or because the patient did not follow the treatment regimen as prescribed.