What type of angina is characterized by vasospasms of coronary arteries and causes unpredictable chest pain?

A. It does not remain dormant but some host defenses can kill the bacteria: While the immune system can kill some of the Mycobacterium tuberculosis bacilli, in many cases, the bacteria evade complete eradication and persist in a dormant state within the lungs. This does not mean the infection is fully eliminated, as it can reactivate later.

B. Virulence factors in the bacilli weaken over time, leading to apoptosis: Mycobacterium tuberculosis does not naturally lose its virulence over time. Instead, it can persist in a latent state due to immune containment, not because of a reduction in its ability to cause disease.

C. The bacilli can become isolated within tubercles in the lungs, possibly encapsulated: In latent tuberculosis, the immune system walls off the bacilli within granulomas (tubercles), preventing active disease. These granulomas may be encapsulated with fibrous tissue, restricting bacterial growth and spread. The bacteria remain dormant but can reactivate if the immune system weakens.

D. Macrophages attack and phagocytize new areas of infection: While macrophages do play a role in the immune response to tuberculosis, they are often unable to completely eradicate the bacilli. Instead, the bacteria can survive within macrophages and trigger the formation of granulomas, which help contain but not eliminate the infection.

A. Administration of broad-spectrum antibiotics: Broad-spectrum antibiotics are not a primary treatment for asthma, as asthma is an inflammatory condition and not primarily caused by bacterial infections. Antibiotics may be used for coexisting infections but are not the most successful initial treatment for chronic asthma.

B. Administration of drugs that decrease airway inflammation: While decreasing airway inflammation is important in managing asthma, the most successful long-term treatment begins with addressing the underlying causes and triggers. Reducing inflammation is part of the treatment strategy but is not the first action.

C. Avoidance of the causative agent: Avoiding the causative agent or trigger of asthma is the most successful initial treatment. Identifying and eliminating exposure to allergens or irritants, such as pollen, smoke, or pet dander, can significantly reduce the frequency and severity of asthma attacks, making it the foundational step in asthma management.

D. Administration of drugs that reduce bronchospasm: Medications that reduce bronchospasm, such as bronchodilators, are essential for immediate relief of asthma symptoms. However, they do not address the underlying inflammation and triggers, making avoidance of causative agents the most successful initial treatment for chronic asthma.