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Transmission cycle/vector/reservoir


- The transmission cycle of TB involves three stages: exposure, infection, and disease.

- Exposure occurs when a person inhales M. tuberculosis from the respiratory droplets of an infectious source, such as a person with active pulmonary TB or a person with latent TB who is undergoing reactivation.

- Infection occurs when the inhaled bacteria reach the alveoli of the lungs and are engulfed by macrophages, which are immune cells that try to kill the bacteria. However, some bacteria survive and multiply inside the macrophages, forming granulomas, which are nodules of infected tissue surrounded by immune cells
Disease:

- Disease occurs when the granulomas break down and release the bacteria into the bloodstream or the airways, causing systemic or pulmonary symptoms.

- The symptoms of TB depend on the type and location of the infection, but they generally include fever, night sweats, weight loss, fatigue, cough, hemoptysis (coughing up blood), chest pain, and dyspnea (difficulty breathing).

- The most common type of TB is pulmonary TB, which affects the lungs and accounts for about 85% of all cases. Pulmonary TB can be classified into primary, secondary, or miliary TB .

- Primary TB occurs when a person is exposed to M. tuberculosis for the first time and develops a primary complex, which consists of a small lesion in the lung (Ghon focus) and enlarged lymph nodes in the hilum (Ghon complex). Primary TB is usually asymptomatic or mild, and it may heal spontaneously or progress to latent or active TB.

- Secondary TB occurs when a person with latent TB experiences reactivation of the bacteria due to a weakened immune system or other factors. Secondary TB usually affects the upper lobes of the lungs and causes cavitation, which is the formation of holes in the lung tissue due to necrosis. Secondary TB is more likely to cause severe symptoms and complications, such as bronchopleural fistula, pneumothorax, or pleural effusion.

- Miliary TB occurs when the bacteria spread through the bloodstream and cause multiple small lesions in various organs, such as the liver, spleen, bone marrow, and meninges. Miliary TB is a life-threatening condition that causes systemic symptoms, such as fever, chills, anorexia, hepatosplenomegaly (enlarged liver and spleen), and meningitis.

- Extrapulmonary TB occurs when the bacteria affect organs other than the lungs, such as the kidneys, bones, lymph nodes, and meninges. Extrapulmonary TB can cause various symptoms depending on the organ involved, such as hematuria (blood in urine), renal failure, osteomyelitis (bone infection), arthritis (joint inflammation), lymphadenitis (swollen lymph nodes), and meningitis. Extrapulmonary TB can also occur in conjunction with pulmonary TB or as a result of military dissemination.

Questions on Transmission cycle/vector/reservoir

Correct Answer is ["A"]

Explanation

E (Contact tracing) is a strategy to identify and screen individuals who may have been exposed to active TB cases, not a direct intervention for LTBI management.

Correct Answer is A

Explanation

Pregnant women, like the elderly, are at higher risk of severe complications if they develop TB during pregnancy. However, the incidence of TB is generally lower in pregnant women compared to young adults between 20 to 30 years of age, who are more socially active and likely to encounter TB-exposed individuals.

Correct Answer is A

Explanation

A borderline reaction is not typically associated with TB testing. Borderline reactions are less specific and are not commonly used to interpret the results of TB skin tests.

Correct Answer is D

Explanation

The tuberculin skin test (TST), also known as the Mantoux test, involves injecting a small amount of tuberculin into the forearm and then measuring the induration (localized swelling and redness) at the injection site after 48 to 72 hours. A positive TST result indicates exposure to TB but does not distinguish between latent TB infection and active TB disease.

Correct Answer is ["A","B","C","E"]

Explanation

This statement is correct. Drug-resistant TB requires more prolonged treatment compared to drug-sensitive TB. Treatment for drug-resistant TB can take months to years and often involves a combination of second and third-line drugs, which may have more side effects and require careful monitoring. Hepatitis. .

Correct Answer is C

Explanation

Surveillance involves monitoring the incidence and prevalence of TB at the population level. It does not directly involve administering the BCG vaccine to individuals at risk.

Correct Answer is ["A","B","E"]

Explanation

Washing hands frequently is an essential measure to prevent the transmission of TB and other infections. Proper hand hygiene reduces the risk of spreading bacteria from contaminated surfaces to the mouth, nose, or eyes.

Correct Answer is C

Explanation

Administering antibiotic therapy is a critical aspect of TB treatment. However, it is not the primary goal of nursing interventions. Nursing interventions primarily focus on the prevention of transmission and supporting patients through their treatment journey.

Correct Answer is C

Explanation

"Placing the patient in a negative pressure room." Placing the patient in a negative pressure room is not a nursing intervention for monitoring treatment response or identifying complications. Negative pressure rooms are used to prevent the spread of airborne infectious agents, but they are not directly related to treatment monitoring.

Correct Answer is B

Explanation

South America, like North America, has a lower TB burden compared to Africa. However, some countries in South America still experience a significant number of TB cases, particularly in areas with limited access to healthcare and socioeconomic challenges. Nonetheless, Africa remains the region with the highest TB burden according to the WHO report.

Correct Answer is ["A","B","D","E"]

Explanation

Providing comfort measures is essential in managing the symptoms of shingles. Cool compresses can help relieve pain and inflammation, loose clothing can prevent irritation of the affected area, distraction techniques can divert the client's attention from discomfort, and relaxation methods can help reduce stress and promote healing.

Correct Answer is C

Explanation

"I understand that the treatment may require surgery if there is extensive lung damage" is a correct statement. In some cases of TB, particularly if there is significant lung damage or complications, surgical intervention may be necessary.

<p>Choices A and D are incorrect statements. Chemoprophylaxis requires taking the medication for an extended period, usually six to nine months, not just a few days.</p>

Isolate the patient until all lesions are crusted over to prevent transmission to others. This statement is correct. Isolating the patient until all the lesions are crusted over is an important infection control measure to prevent the spread of the varicella-zoster virus to others. Once the lesions

Avoiding potential drug interactions is an essential consideration in any medical treatment, but it is not the primary reason for using multiple drugs in TB treatment. The main focus is on preventing drug resistance and increasing treatment success.

"Sputum culture." Sputum culture is a gold standard diagnostic test for confirming active TB disease and identifying the specific strain of Mycobacterium tuberculosis. While it is highly sensitive and specific for diagnosing active TB, it is not more specific than the IGRA for detecting TB infection

The patient should not return to work or school until all lesions are crusted over and they are no longer contagious. Typically, this occurs about 6-7 days after the rash first appears. Returning too early can increase the risk of spreading the virus to others.

D is also accurate; the BCG vaccine is administered intramuscularly.

Cough is a hallmark symptom of tuberculosis. It is usually a productive cough that lasts for several weeks or longer, with the possibility of producing sputum that may be bloody or purulent. Cough is a key indicator for healthcare providers to suspect TB and order appropriate testing.

Sharing personal items should be avoided during shingles, as it can increase the risk of transmission to others who have not had chickenpox or been vaccinated.

Identifying and testing persons who have been in close contact with active TB cases is part of contact tracing and TB screening efforts, which are separate from the purpose of directly observed therapy (DOT) DOT is centered on the supervision of treatment for clients already diagnosed with active TB

Isolating infected individuals until all lesions are crusted over is a measure to prevent the spread of chickenpox, but it is not as effective as vaccination in preventing the disease and its complications. Now, searching for three additional ATI/HESI MCQs related to the topic of Tuberculosis (TB)

Pain management is essential for patients with TB, especially for those experiencing chest pain, which can be a symptom of the disease or a complication. Adequate pain control improves the patient's comfort and compliance with treatment.
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