USCIS Research & Evidence-Based Practice 3

Question 1

According to evidence-based standards, what is the gold standard for confirming a diagnosis of active pulmonary tuberculosis in an immigration medical exam?

Accepted Answer

Positive sputum culture for Mycobacterium tuberculosis

Answer

Sputum culture remains the gold standard for confirming active TB because it provides definitive microbiological proof and allows drug-sensitivity testing.

Question 2

What evidence-based criterion differentiates Class A from Class B tuberculosis classification in immigration medical exams?

Accepted Answer

Presence of active infectious disease versus non-active or treated disease

Answer

Class A TB involves current active, infectious disease requiring inadmissibility, while Class B TB indicates non-active or previously treated disease that requires follow-up after admission.

Question 3

The research-supported diagnostic approach for syphilis in immigration medical exams requires which testing strategy?

Accepted Answer

Both a treponemal and a non-treponemal serological test

Answer

Dual serological testing with both treponemal and non-treponemal tests provides evidence-based confirmation that reduces both false positives and false negatives.

Question 4

Research shows that which factor most significantly reduces the sensitivity of the tuberculin skin test (TST)?

Accepted Answer

Prior BCG vaccination and immunosuppression

Answer

BCG vaccination can cause false-positive TST results, while immunosuppression reduces immune response, causing false-negative results—both directly impair TST accuracy.

Question 5

In tuberculosis screening research, the 'booster phenomenon' refers to which evidence-based finding?

Accepted Answer

Enhanced TST reactivity caused by prior sensitization being recalled by the test itself

Answer

The booster phenomenon occurs when a first TST restimulates a waning immune memory, causing a larger reaction on a second TST that may be misread as new infection.

USCIS - Medical Exam Practice Test

USCIS - Medical Exam Practice Test

USCIS Research & Evidence-Based Practice 3