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MLT 243 Q7 with precise detailed answers, Exams of Immunology

Saddleback CollegeImmunology

MLT 243 Q7 with precise detailed answers

Typology: Exams

2024/2025

Available from 07/08/2025

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MLT |! 243 |! Q7 |! with |! precise |! detailed |! answers
At |! which |! stage |! of |! syphilis |! is |! the |! RPR |! the |! most |! sensitive? |! - |! Correct |! answer |!
✔Secondary
Patient |! serum |! is |! mixed |! with |! gel |! particles |! that |! have |! been |! sensitized |! with |!
Treponema |! pallidum |! antigens |! as |! well |! as |! with |! unsensitized |! gel |! particles |! in |! a
|! separate |! well. |! Agglutination |! was |! observed |! in |! the |! well |! with |! sensitized |! gel |!
particles |! but |! not |! in |! the |! well |! with |! unsensitized |! gel |! particles. |! What |! is |! the |!
interpretation |! of |! these |! results? |! - |! Correct |! answer |! ✔Positive |! for |! anti-T |!
pallidum |! antibodies
A |! patient |! presents |! with |! a |! painless |! genital |! ulcer. |! The |! patient |! is |! then |!
diagnosed |! as |! having |! syphilis. |! In |! what |! stage |! of |! syphilis |! is |! the |! patient? |! - |!
Correct |! answer |! ✔Primary
A |! patient |! presents |! with |! personality |! changes, |! altered |! mental |! state, |! and |!
delusions |! of |! grandeur. |! The |! patient |! is |! then |! diagnosed |! as |! having |! syphilis. |!
The |! patient |! is |! most |! likely |! in |! which |! stage |! of |! syphilis? |! - |! Correct |! answer |!
✔Tertiary
A |! new |! technologist |! is |! busy |! one |! night |! and |! has |! to |! perform |! an |! RPR |! on |! a |!
serum |! sample. |! He |! does |! not |! calibrate |! the |! needle |! delivering |! the |! antigen, |! and |!
the |! needle |! is |! delivering |! a |! larger |! volume |! of |! antigen |! than |! it |! is |! supposed |! to. |!
What |! kind |! of |! error |! can |! this |! produce? |! - |! Correct |! answer |! ✔Laboratory-
induced |! false |! negative |! resulting |! from |! postzone
pf3
pf4
pf5

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MLT |! 243 |! Q7|! with|! precise |! detailed |! answers

At |! which |! stage |! of |! syphilis |! is |! the |! RPR |! the |! most |! sensitive? |! - |! Correct |! answer |! ✔Secondary Patient |! serum |! is |! mixed |! with |! gel |! particles |! that |! have |! been |! sensitized |! with |! Treponema |! pallidum |! antigens |! as |! well |! as |! with |! unsensitized |! gel |! particles |! in |! a |! separate |! well. |! Agglutination |! was |! observed |! in |! the |! well |! with |! sensitized |! gel |! particles |! but |! not |! in |! the |! well |! with |! unsensitized |! gel |! particles. |! What |! is |! the |! interpretation |! of |! these |! results? |! - |! Correct |! answer |! ✔Positive |! for |! anti-T |! pallidum |! antibodies A |! patient |! presents |! with |! a |! painless |! genital |! ulcer. |! The |! patient |! is |! then |! diagnosed |! as |! having |! syphilis. |! In |! what |! stage |! of |! syphilis |! is |! the |! patient? |! - |! Correct |! answer |! ✔Primary A |! patient |! presents |! with |! personality |! changes, |! altered |! mental |! state, |! and |! delusions |! of |! grandeur. |! The |! patient |! is |! then |! diagnosed |! as |! having |! syphilis. |! The |! patient |! is |! most |! likely |! in |! which |! stage |! of |! syphilis? |! - |! Correct |! answer |! ✔Tertiary A |! new |! technologist |! is |! busy |! one |! night |! and |! has |! to |! perform |! an |! RPR |! on |! a |! serum |! sample. |! He |! does |! not |! calibrate |! the |! needle |! delivering |! the |! antigen, |! and |! the |! needle |! is |! delivering |! a |! larger |! volume |! of |! antigen |! than |! it |! is |! supposed |! to. |! What |! kind |! of |! error |! can |! this |! produce? |! - |! Correct |! answer |! ✔Laboratory- induced |! false |! negative |! resulting |! from |! postzone

The |! RPR |! and |! VDRL |! tests |! differ |! from |! each |! other |! in |! which |! of |! the |! following |! ways? |! - |! Correct |! answer |! ✔Method |! for |! reading |! or |! visualizing |! the |! reaction The |! antibody |! called |! reagin |! that |! is |! found |! in |! syphilis: |! - |! Correct |! answer |! ✔reacts |! with |! cardiolipin. Laboratory |! results |! for |! a |! patient |! indicated |! a |! positive |! RPR |! and |! a |! negative |! FTA. |! The |! patient |! had |! no |! obvious |! sore, |! rash, |! or |! other |! symptoms. |! What |! is |! the |! most |! likely |! cause |! of |! these |! results? |! - |! Correct |! answer |! ✔Another |! disease, |! such |! as |! mononucleosis The |! antibody |! known |! as |! reagin |! is: |! - |! Correct |! answer |! ✔tested |! for |! using |! charcoal |! sensitized |! with |! cardiolipin. Advantages |! of |! polymerase |! chain |! reaction |! testing |! for |! Lyme |! disease |! include |! which |! of |! the |! following? |! - |! Correct |! answer |! ✔High |! sensitivity Syphilis |! is |! spread |! by: |! - |! Correct |! answer |! ✔sexual |! transmission. The |! vectors |! that |! transmit |! Borrelia |! burgdorferi |! from |! natural |! reservoirs |! to |! humans |! are: |! - |! Correct |! answer |! ✔ticks. Using |! the |! reverse |! algorithm |! method |! for |! syphilis |! diagnosis, |! a |! positive |! initial |! test |! and |! a |! negative |! follow-up |! test |! could |! be |! interpreted |! as: |! - |! Correct |! answer

Which |! of |! the |! following |! is |! a |! cause |! of |! a |! laboratory-induced |! false-negative |! result |! in |! the |! screening |! tests |! for |! syphilis? |! - |! Correct |! answer |! ✔Excess |! serum |! antibody Which |! of |! the |! following |! is |! a |! cause |! of |! a |! biological |! false-negative |! result |! in |! the |! nontreponemal |! tests |! for |! syphilis? |! - |! Correct |! answer |! ✔Secondary |! syphilis Treponema |! pallidum |! and |! Borrelia |! burgdorferi |! can |! be |! distinguished |! from |! each |! other |! on |! the |! basis |! of |! which |! of |! the |! following? |! - |! Correct |! answer |! ✔Only |! B |! burgdorferi |! can |! be |! grown |! in |! the |! laboratory |! on |! artificial |! media. Which |! HIV |! group |! is |! responsible |! for |! a |! majority |! of |! the |! HIV |! infections |! worldwide? |! - |! Correct |! answer |! ✔Group |! M Of |! the |! designated |! subtypes |! of |! HIV, |! which |! is |! the |! most |! common |! in |! the |! United |! States? |! - |! Correct |! answer |! ✔Subtype |! B Which |! of |! the |! following |! peripheral |! blood |! measurements |! is |! used |! to |! determine |! the |! stage |! of |! HIV |! infection? |! - |! Correct |! answer |! ✔The |! number |! of |! CD4 |! T |! cells Which |! of |! the |! following |! is |! considered |! the |! best |! indicator |! of |! immune |! function |! in |! HIV-infected |! individuals? |! - |! Correct |! answer |! ✔CD4 |! T-cell |! count The |! most |! commonly |! used |! HIV |! drug-resistance |! assays |! are |! based |! on: |! - |! Correct |! answer |! ✔detection |! of |! genetic |! mutations |! in |! HIV.

CD4 |! T |! cells |! play |! a |! central |! role |! in |! the |! immune |! response |! system |! by |! regulating |! the |! activities |! of |! B |! and |! T |! lymphocytes. |! - |! Correct |! answer |! ✔True Histoplasmosis |! (disseminated |! or |! extrapulmonary) |! is |! an |! opportunistic |! infection |! of |! stage |! 3 |! HIV |! infection. |! - |! Correct |! answer |! ✔True When |! HIV |! replicates, |! the |! DNA |! in |! the |! viral |! genome |! is |! transcribed |! into |! RNA. |! - |! Correct |! answer |! ✔False In |! the |! Western |! blot |! test |! for |! HIV |! antibody, |! a |! positive |! test |! result |! is |! indicated |! by |! the |! bands |! p24 |! and |! p55. |! - |! Correct |! answer |! ✔False A |! 36-year-old |! male |! presents |! to |! a |! free |! clinic |! with |! symptoms |! of |! anorexia, |! malaise, |! vomiting, |! abdominal |! pain, |! and |! mild |! jaundice. |! The |! patient |! is |! a |! known |! IV |! drug |! abuser. |! The |! physician |! orders |! liver |! function |! tests |! and |! an |! acute |! hepatitis |! serum |! panel. |! The |! laboratory |! reports |! the |! following |! results: |! anti-HAV |! IgM |! = |! not |! detected; |! HBsAg |! = |! not |! detected; |! anti-HBc |! IgM |! = |! not |! detected; |! anti-HBc |! total |! = |! detected; |! anti-HBs |! = |! detected; |! anti-HCV |! = |! detected. |! These |! findings |! are |! consistent |! with: |! - |! Correct |! answer |! ✔acute |! hepatitis |! C. A |! patient |! has |! the |! following |! hepatitis |! profile |! after |! presenting |! with |! jaundice, |! nausea, |! and |! vomiting: |! anti-HAV |! IgM |! = |! detected; |! HBsAg |! = |! not |! detected; |! anti-HBc |! IgM |! = |! not |! detected; |! anti-HBc |! total |! = |! detected; |! anti-HBs |! = |! not |! detected; |! anti-HCV |! = |! not |! detected. |! What |! is |! his |! diagnosis? |! - |! Correct |! answer |! ✔Acute |! hepatitis |! A

Viruses |! can |! evade |! host |! defenses |! by: |! - |! Correct |! answer |! ✔hiding |! from |! the |! immune |! system |! in |! a |! latent |! state. Swollen |! parotid |! glands |! are |! key |! diagnostic |! indicators |! of: |! - |! Correct |! answer |! ✔mumps. Which |! virus |! is |! transmitted |! primarily |! by |! aerosolized |! respiratory |! droplets? |! - |! Correct |! answer |! ✔Varicella-zoster |! virus Human |! T-cell |! lymphotropic |! virus |! type |! I |! preferentially |! infects: |! - |! Correct |! answer |! ✔CD4 |! T |! lymphocytes. A |! newborn |! infant |! tests |! positive |! for |! anti-HBc |! IgG. |! This |! result |! is |! evidence |! that: |! - |! Correct |! answer |! ✔the |! mother |! was |! infected |! with |! hepatitis |! B. Which |! of |! the |! following |! serologic |! test |! results |! indicate |! that |! a |! patient |! is |! a |! chronic |! carrier |! of |! hepatitis |! B? |! - |! Correct |! answer |! ✔HBsAb |! negative; |! HBsAg |! positive |! for |! 12 |! months A |! patient |! has |! detectable |! levels |! of |! IgG |! and |! IgM |! against |! the |! viral |! capsid |! antigens |! of |! Epstein-Barr |! virus |! (EBV). |! This |! patient |! has: |! - |! Correct |! answer |! ✔a |! current |! infection |! with |! EBV.