What is the difference between primary and post primary TB?
Primary TB stimulates systemic immunity that kills organisms and heals granulomas resulting in both protection from disseminated TB and resistance to new infection. Post primary TB, in contrast, requires systemic immunity that it subverts to produce local susceptibility in the apex of the lung.
What is post primary TB?
Post-primary pulmonary tuberculosis is a chronic disease commonly caused by either endogenous reactivation of a latent infection or exogenous re-infection by Mycobacterium tuberculosis.
What radiographic finding is most consistent with reactivation or post primary tuberculosis?
Characteristic Radiologic Findings The most common radiographic manifestation of post-primary tuberculosis is a focal or patchy, heterogeneous consolidation involving the apical and posterior segments of the upper lobes and the superior segments of the lower lobes.
Is post primary TB contagious?
Pulmonary TB is caused by the bacterium Mycobacterium tuberculosis (M tuberculosis). TB is contagious. This means the bacteria are easily spread from an infected person to someone else. You can get TB by breathing in air droplets from a cough or sneeze of an infected person.
Is post primary TB is 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 is the difference between primary and 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 …
How does TB present on CXR?
Chest X-ray of a person with advanced tuberculosis: Infection in both lungs is marked by white arrow-heads, and the formation of a cavity is marked by black arrows.
Is post primary TB curable?
Post primary tuberculosis is typically restricted to the upper lobes of the lungs and does not involve lymph nodes or other organs. About 90% of cases recover spontaneously without therapy. However those that become ill account for 80% of all clinical cases and nearly 100% of transmission of infection.
Is tuberculosis primary secondary or tertiary?
Tertiary Prevention11 Each person with infectious TB has the potential to infect many others; however, the site of the infection is important in determining its capability to spread. For example, the lungs and larynx are two common organs where TB may be highly infectious.