Which of the following vaccines is contra-indicated in symptomatic HIV infection whose CD4 count is less than… - DSSSB - 28 August 2019 (Shift-1)

DSSSB - 28 August 2019 (Shift-1)

Medical & Surgical Nursing

Medium

Appeared in: DSSSB - 28 August 2019 (Shift-1)

Explanation

BCG (Bacillus Calmette-Guérin) is a live attenuated bacterial vaccine.
In individuals with a severely weakened immune system, such as a person with symptomatic HIV and a CD4 count below 400 cells/mm³, the live bacteria in the vaccine can cause a serious, widespread infection known as disseminated BCG disease.
Health guidelines, including those from the WHO, explicitly state that BCG vaccine is contraindicated for individuals with symptomatic HIV infection due to this high risk.
The risk of disseminated disease from the BCG vaccine outweighs any potential benefit of preventing tuberculosis in this patient population.

Option A: DPT is a combination vaccine containing diphtheria toxoid, tetanus toxoid, and an acellular pertussis component. None of these are live organisms, so they cannot cause an active infection and are safe for immunocompromised individuals.
Option C: While Yellow fever is also a live attenuated vaccine and is contraindicated in severe immunodeficiency, the contraindication for BCG is considered more absolute in symptomatic HIV. Some guidelines may permit Yellow fever vaccine if the CD4 count is above 200 and travel to an endemic area is unavoidable, but BCG is more strictly forbidden.
Option D: Tetanus toxoid is an inactivated toxin, not a live bacterium. It cannot replicate or cause disease. It is safe and recommended for all individuals, including those with HIV, to maintain protection against tetanus.

Clinical Relevance

Nursing practice connection: Knowing Vaccination in immunocompromised patients, specifically those with symptomatic HIV infection helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
A critical nursing responsibility is to verify a patient's immune status before administering any live vaccine. This includes checking for diagnoses like HIV, cancer, or the use of immunosuppressive medications.
Failure to identify a contraindication can lead to severe, life-threatening adverse events, such as disseminated infection from a live vaccine.
Always cross-reference patient history and recent lab values (like CD4 counts in HIV patients) with vaccination guidelines.

How to Approach the Question

First, identify the key clinical information about the patient: 'symptomatic HIV infection' and 'CD4 count less than 400 cells/mm³'. This combination points to severe immunodeficiency.
Next, understand the question's core task: identify the 'contra-indicated' vaccine, meaning the one that is unsafe to give.
Categorize the vaccines in the options as either 'live attenuated' or 'non-live' (inactivated/toxoid).
Apply the fundamental rule of immunology: Live attenuated vaccines are generally contraindicated in severely immunocompromised individuals due to the risk of causing an actual infection.
Identify that both BCG and Yellow fever are live vaccines, while DPT and Tetanus toxoid are not.
Between the two live vaccines, recall that BCG is particularly dangerous in HIV-positive individuals due to the specific risk of disseminated BCG disease, making it the most definitive contraindication on the list.

Concept Tested & Keywords

Concept Tested: Vaccination in immunocompromised patients, specifically those with symptomatic HIV infection.
Stem keywords: vaccines, contra-indicated, symptomatic HIV infection, CD4 count less than 400
Lead-in keywords: Which of the following
Clinical cues: The combination of 'symptomatic HIV' and 'CD4 count less than 400' indicates severe immunosuppression, which is the key factor in determining vaccine safety.

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart B (pp 202-403 of 604) p. 43-45

E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 117-119