Teach me these according to amc guidelines.Q. 6yo girl, doesn't like to talk, study good, conversation with family good. 1. 3. 4. Separation – no separation mention 2. Adjust – no stress ASD – no issue s with communication Selective mutism – only in specific situation Q. One man back from Bali, no sex with others except his partner, cervical lymphadenopathy, tender mild, hepatosplenomegaly, fever. 1. EBV – Fever, LAD 1. 2. HIV – multiple sexual partners Zica virus – eye, rash, joints Q. A patient with diplococci positive infection. What is the most appropriate treatment? 1. Flucloxacillin Gram +ve – Pneumococci - amoxicillin Gram negative – Neisseria - ceftriaxone Q. A patient with RA on multiple medications, including tocilizumab and others, presents with severe acute abdominal pain. Imaging reveals a gastrointestinal perforation. Which medication is most strongly associated with this complication? 1. Tocilizumab Best is steroid more specific for perforation NSAID is less specific for perforation rather it cause ulcer more

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I now have enough solid textbook content to write a thorough, AMC-focused teaching answer. Let me compose the full response.

AMC MCQ Teaching: All 4 Questions

Q1 - 6-year-old girl who doesn't talk at school, communicates fine at home

Answer: Selective Mutism

Why this is the right answer - step by step reasoning

The key features given:

She does talk at home (communication with family is good)
She does study well (so cognition is intact)
She won't talk in certain situations (school/social settings)
No separation anxiety mentioned
No developmental or autism-spectrum features

How to eliminate the distractors

Diagnosis	Why it fits / doesn't fit
Separation Anxiety Disorder	Presents with distress on separation from caregiver - not mentioned here. She is at school and not upset about being away from mum; she just won't speak. Ruled out.
Adjustment Disorder	Requires an identifiable psychosocial stressor within the last 3 months producing marked distress beyond what is expected. No stressor is mentioned in this stem. Ruled out.
ASD (Autism Spectrum Disorder)	Core deficits are in social communication AND social interaction PLUS restricted/repetitive behaviours - these must be pervasive, not situation-specific. ASD children have impaired communication everywhere, not just at school. This child communicates normally at home. Ruled out.
Selective Mutism	DSM-5 criteria: (1) persistent failure to speak in specific social situations where speaking is expected (e.g. school), (2) ability to speak in other situations (home), (3) interferes with function, (4) duration ≥ 1 month (not the 1st month of school), (5) not due to communication disorder or another mental illness. This fits perfectly.

AMC key teaching points on Selective Mutism

Onset typically ages 4-8 years; often preschool shy, but becomes apparent when the child must speak aloud at school
The child is not globally mute - they speak fluently at home and in familiar settings
Strongly related to social anxiety disorder - the same neural substrate, but situation-specific
Children may use gestures, nods, or whispering as alternatives at school
Do not diagnose in the first month of school (adjustment period)
Exclude: communication disorders (e.g. stuttering, dysphasia), autism, intellectual disability, language barrier
Treatment: behavioural therapy (stimulus fading, shaping), CBT; SSRIs (e.g. fluoxetine) are used pharmacologically
Kaplan & Sadock's Synopsis of Psychiatry, p.646-648

Q2 - Man back from Bali, monogamous, fever, cervical lymphadenopathy (tender, mild), hepatosplenomegaly

Answer: EBV (Infectious Mononucleosis)

Why EBV is correct

The classic triad of infectious mononucleosis:

Fever
Lymphadenopathy (typically cervical, tender)
Hepatosplenomegaly (splenomegaly in ~50%, hepatomegaly common)

Plus: pharyngitis/exudative tonsillitis, atypical lymphocytosis on FBC, positive monospot (heterophile antibody test).

EBV infects B lymphocytes via the CD21 receptor. The immune response (T-cell proliferation) is what produces the clinical syndrome.

How to eliminate distractors

Diagnosis	Key features that are ABSENT here	Why ruled out
Acute HIV (ARS)	Typically requires multiple sexual partners or high-risk behaviour (unprotected sex with new partners, IV drug use, MSM). This man only had sex with his regular partner. Also presents with: flu-like illness, diffuse rash, oral ulcers, no hepatosplenomegaly as a dominant feature. Ruled out by history - monogamous.
Zika Virus	Bali is a Zika-risk area, so travel fits. But Zika classically presents with: maculopapular rash, arthralgia/joint pain, non-purulent conjunctivitis - the "rash + red eyes + joint pain" triad. No hepatosplenomegaly. No significant lymphadenopathy. Ruled out by absence of rash and conjunctivitis.

AMC key teaching points on EBV / Infectious Mononucleosis

Caused by Epstein-Barr virus (HHV-4), transmitted via saliva ("kissing disease")
Incubation 4-6 weeks
Investigations: FBC - atypical lymphocytes (Downey cells); monospot test (heterophile antibodies); EBV IgM for definitive diagnosis
AVOID ampicillin/amoxicillin - causes a florid non-allergic morbilliform rash in ~80% of EBV patients
Treatment is supportive; no specific antiviral
Avoid contact sports for 21 days minimum due to risk of splenic rupture
Steroids only for: severe tonsillar obstruction, massive splenomegaly, myocarditis, haemolytic anaemia, HLH
Red Book 2021 (Committee on Infectious Diseases), p.547-553

Q3 - Patient with diplococci on gram stain - most appropriate treatment?

Answer: It depends on Gram stain result - the critical distinction is Gram-POSITIVE vs Gram-NEGATIVE diplococci

This is one of the most commonly tested AMC microbiology concepts. Your notes have it right - let me reinforce the logic:

The framework

Finding	Organism	First-line treatment
Gram-POSITIVE diplococci	Streptococcus pneumoniae (Pneumococcus)	Amoxicillin (or penicillin V/G for non-resistant strains)
Gram-NEGATIVE diplococci	Neisseria gonorrhoeae or N. meningitidis	Ceftriaxone (3rd-gen cephalosporin)

Why not Flucloxacillin?

Flucloxacillin is an anti-staphylococcal penicillin - it covers Gram-positive cocci in clusters (Staphylococcus aureus, specifically MSSA). It has no role in:

Neisseria infections
Pneumococcal infections (amoxicillin is preferred here)

AMC key points

N. gonorrhoeae: Gram-negative intracellular diplococci (kidney-bean shaped, found inside neutrophils). Treatment: ceftriaxone 500mg IM single dose (now the standard due to quinolone resistance)
N. meningitidis: Gram-negative diplococci; treatment: ceftriaxone IV for meningococcal meningitis/septicaemia
S. pneumoniae: Gram-positive diplococci (lancet-shaped, in pairs). Sensitive to penicillin/amoxicillin; for meningitis, use ceftriaxone + consider vancomycin pending sensitivities
The question stem says "diplococci positive infection" - this likely means Gram-positive diplococci (pneumococci), making amoxicillin the best answer over flucloxacillin
Harrison's Principles of Internal Medicine 22E, p.910+

Q4 - RA patient on tocilizumab + others, presents with GI perforation - which drug is most responsible?

Answer: Tocilizumab

Mechanism - why tocilizumab causes GI perforation

Tocilizumab is a recombinant humanised anti-IL-6 receptor monoclonal antibody. IL-6 plays a role in mucosal healing and maintaining intestinal wall integrity. By blocking IL-6 signalling:

Mucosal repair is impaired
Diverticulitis can progress to perforation without the usual inflammatory warning signs (pain may be blunted due to suppression of IL-6-mediated inflammation)
The incidence of lower GI perforation (particularly diverticular) is significantly elevated compared to other biologics

This is a black-box level warning for tocilizumab - GI perforation is a known, serious adverse effect.

"Gastrointestinal perforation has been reported in patients receiving tocilizumab for rheumatoid arthritis." - Katzung's Basic & Clinical Pharmacology, 16th Ed., p.1383

Why not the other options?

Drug	GI risk profile	Notes
Corticosteroids	Cause GI ulceration (peptic ulcer disease) more than perforation. Can contribute to perforation if an existing ulcer perforates, but this is less specific.	Often co-prescribed in RA
NSAIDs	Cause peptic ulcer disease and upper GI bleeding (COX-1 inhibition reduces prostaglandin-mediated mucosal protection). NSAIDs are associated with ulcers, not direct perforation of the lower GI tract.	Less specific for perforation
Methotrexate	Hepatotoxicity, myelosuppression - not GI perforation
Other biologics (TNF inhibitors)	Infection risk; GI perforation is much less associated than with tocilizumab

AMC key teaching point

The AMC wants you to know: tocilizumab is uniquely associated with lower GI (especially diverticular) perforation among RA medications. The mechanism is IL-6 blockade impairing gut wall integrity + masking symptoms of developing inflammation. Any RA patient on tocilizumab who presents with acute abdomen must have GI perforation at the top of the differential.

Rheumatology, 2-Volume Set (Elsevier 2022)
Katzung's Basic & Clinical Pharmacology 16th Ed.

Quick Summary Table

Q	Answer	Key Discriminator
Q1	Selective Mutism	Speaks at home, silent at school - situation-specific, not pervasive
Q2	EBV (Infectious Mononucleosis)	Monogamous, fever + LAD + hepatosplenomegaly = classic mono triad; no rash/joints
Q3	Gram-positive → Amoxicillin; Gram-negative → Ceftriaxone (NOT flucloxacillin)	Diplococci type drives treatment
Q4	Tocilizumab (IL-6 blocker)	Specifically associated with lower GI perforation; steroids/NSAIDs cause ulcers

Teach me acvirding to alc guudelines.Q. 6yo girl, doesn't like to talk, study good, conversation with family good. 1. 3. 4. Separation – no separation mention 2. Adjust – no stress ASD – no issue s with communication Selective mutism – only in specific situation Q. One man back from Bali, no sex with others except his partner, cervical lymphadenopathy, tender mild, hepatosplenomegaly, fever. 1. EBV – Fever, LAD 1. 2. HIV – multiple sexual partners Zica virus – eye, rash, joints Q. A patient with diplococci positive infection. What is the most appropriate treatment? 1. Flucloxacillin Gram +ve – Pneumococci - amoxicillin Gram negative – Neisseria - ceftriaxone Q. A patient with RA on multiple medications, including tocilizumab and others, presents with severe acute abdominal pain. Imaging reveals a gastrointestinal perforation. Which medication is most strongly associated with this complication? 1. Tocilizumab Best is steroid more specific for perforation NSAID is less specific for perforation rather it cause ulcer more

I already covered all four questions in detail in my previous response just above. Let me give you a clean, structured re-teaching since you've resubmitted - same questions, same content, but I'll make it even cleaner and more exam-focused.

AMC MCQ Teaching - All 4 Questions

Q1 - 6yo girl, doesn't talk (at school), studies well, talks fine with family

Correct Answer: Selective Mutism

The Logic - Eliminate First, Confirm Last

Step 1: Read the stem carefully for what IS and IS NOT present

Feature	Present?
Talks freely at home	YES
Studies well (cognition intact)	YES
Doesn't talk in specific situations (school/social)	YES
Separation distress	NO
Identifiable stressor	NO
Communication problems everywhere	NO
Restricted/repetitive behaviours	NO

Step 2: Eliminate distractors

Separation Anxiety Disorder - OUT

Hallmark is excessive fear/distress when separated from attachment figures
Child cries, refuses school, has physical symptoms (nausea, headache) anticipating separation
The stem says no separation is mentioned - if it were separation anxiety, the examiner would tell you the child cries when mum leaves
This child is simply not talking - no distress about being away from family is described

Adjustment Disorder - OUT

Requires an identifiable psychosocial stressor (death in family, divorce, moving house, new school)
The stem explicitly says "no stress" - this is a direct elimination clue
Symptoms must develop within 3 months of the stressor and resolve within 6 months of its removal

ASD (Autism Spectrum Disorder) - OUT

DSM-5 requires deficits in TWO core domains:
1. Social communication and social interaction - must be pervasive (everywhere, not just school)
2. Restricted, repetitive patterns of behaviour
This girl communicates normally at home - ASD does not switch on and off depending on location
Good academic performance also argues against ASD
The AMC will never give you ASD without mentioning repetitive behaviours, restricted interests, or developmental concerns

Selective Mutism - CORRECT DSM-5 criteria (all present here):

Consistent failure to speak in specific social situations where speaking is expected (school)
Ability to speak in other situations (home, family)
Interferes with educational achievement or social communication
Duration at least 1 month (not limited to the first month of school)
Not better explained by a communication disorder, ASD, or language barrier

Key AMC Points to Remember

Age of onset: typically 4-8 years - becomes obvious when the child must speak aloud in class
It is classified under anxiety disorders in DSM-5, not communication disorders
Closely related to social anxiety disorder - same pathophysiology, different expression
The child is not defiant - they genuinely cannot speak due to anxiety in that context
Some children whisper, gesture, or use eye contact as substitutes
Risk factors: family history of anxiety, immigrant families (language barrier can overlap), overprotective parenting
Treatment: behavioural therapy (stimulus fading, shaping), CBT, SSRIs (fluoxetine is first-line pharmacotherapy)
Do NOT diagnose in the first month of starting a new school

Q2 - Man from Bali, monogamous, fever + cervical LAD (tender, mild) + hepatosplenomegaly

Correct Answer: EBV (Infectious Mononucleosis)

The Diagnostic Triad for EBV

Fever + Lymphadenopathy + Hepatosplenomegaly = Infectious Mononucleosis until proven otherwise

EBV infects B lymphocytes via the CD21 receptor. The clinical syndrome is caused by the massive CD8+ T-cell response (atypical lymphocytes you see on blood film).

Eliminate the Distractors

HIV Acute Retroviral Syndrome - OUT

Requires high-risk sexual behaviour: multiple partners, unprotected sex with unknown status partners, MSM, IV drug use
The stem explicitly states he only had sex with his regular partner - this is a deliberate clue to exclude HIV
ARS presents with: flu-like illness, diffuse truncal rash, oral ulcers, myalgia, generalised LAD
Hepatosplenomegaly is not a dominant feature of ARS

Zika Virus - OUT

Bali IS an endemic area, so travel history fits - this is a deliberate distractor
But Zika's classic triad is: rash + conjunctivitis (red eyes) + arthralgia/joint pain
Zika does NOT typically cause significant lymphadenopathy or hepatosplenomegaly
The stem has none of Zika's key features (no rash, no red eyes, no joint pain)
The AMC is testing whether you know what Zika looks like, not just where it comes from

EBV - CORRECT

AMC Key Points on EBV

Feature	Detail
Virus	Epstein-Barr virus (HHV-4)
Transmission	Saliva - "kissing disease"
Incubation	4-6 weeks
Classic triad	Fever + pharyngitis/tonsilitis + cervical LAD
Also present	Hepatosplenomegaly, palatal petechiae, morbilliform rash
Blood film	Atypical lymphocytes (Downey cells)
Rapid test	Monospot (heterophile antibody) - >90% sensitive in adults
Confirmatory test	EBV IgM antibody (VCA IgM)

Critical AMC rule: NEVER give ampicillin or amoxicillin to a patient with EBV

Causes a florid, non-allergic morbilliform rash in ~80% of patients
This is a type of immune complex reaction, not true penicillin allergy

Management:

Supportive - rest, analgesia, hydration
No antiviral (acyclovir has no clinical benefit in immunocompetent patients)
Avoid contact sports for at least 21 days - risk of splenic rupture
Steroids only if: airway obstruction from massive tonsils, haemolytic anaemia, myocarditis, HLH

Q3 - Patient with diplococci infection - most appropriate treatment?

The answer depends entirely on whether the diplococci are Gram-positive or Gram-negative

This is a pure microbiology/pharmacology memory question. The AMC tests this repeatedly because the two organisms look similar morphologically but need completely different antibiotics.

The Master Rule

Gram Stain	Morphology	Organism	First-line Treatment
Gram-POSITIVE	Lancet-shaped pairs	Streptococcus pneumoniae (Pneumococcus)	Amoxicillin (or benzylpenicillin)
Gram-NEGATIVE	Kidney-bean shaped pairs, intracellular	Neisseria gonorrhoeae	Ceftriaxone (IM, single dose)
Gram-NEGATIVE	Diplococci in pairs	Neisseria meningitidis	Ceftriaxone (IV)

Why Flucloxacillin is WRONG

Flucloxacillin is a beta-lactamase stable penicillin designed specifically for:

MSSA (Staphylococcus aureus - Gram-positive cocci in clusters)
Skin and soft tissue infections, septic arthritis, osteomyelitis caused by Staph

It has no activity against:

Gram-negative organisms (no coverage of Neisseria)
Streptococcus pneumoniae (amoxicillin is used instead)
Any diplococci arrangement

The AMC Logic

The stem says "diplococci positive infection" - if this means Gram-positive diplococci (pneumococci), the answer is amoxicillin.

If the context suggests urethral discharge, pelvic infection, or neonatal eye discharge with intracellular diplococci on Gram stain, think Neisseria and use ceftriaxone.

Flucloxacillin is a trap answer placed because students associate "positive" with the antibiotic, not with Gram stain result.

Extra AMC Facts on Gonorrhoea Treatment

Current Australian standard: ceftriaxone 500mg IM single dose (500mg not 250mg - updated due to resistance)
Add azithromycin 1g oral if chlamydia co-infection not excluded
Resistance has made ciprofloxacin and penicillin no longer appropriate empirically in Australia

Q4 - RA patient on tocilizumab + other drugs, develops GI perforation

Correct Answer: Tocilizumab

Your notes say "steroids are more specific for perforation" - let me clarify this precisely

This is a common confusion point. Here is the exact breakdown:

Drug	Primary GI risk	Mechanism
Tocilizumab	Lower GI perforation (diverticular)	Blocks IL-6 receptor → impairs intestinal wall integrity + masks warning inflammation
Corticosteroids	Peptic ulceration → can lead to perforation	Inhibit prostaglandins, reduce mucus, impair mucosal healing - upper GI predominant
NSAIDs	Peptic ulcer disease, upper GI bleeding	COX-1 inhibition → reduced prostaglandin-mediated mucosal protection - mainly ulcers not perforation
Methotrexate	Mucositis, hepatotoxicity	Not GI perforation

The Key Distinction the AMC Tests

NSAIDs and steroids cause ulcers - which can secondarily perforate
Tocilizumab causes direct lower GI perforation (especially diverticular) - this is in the black-box warning
The mechanism is unique: IL-6 blockade impairs gut wall integrity AND simultaneously suppresses the inflammatory signals that would otherwise warn you (pain, fever) that something is going wrong
This means perforation can be clinically silent until it is severe in patients on tocilizumab

Why Tocilizumab is the Best Answer

The question specifically asks which medication is "most strongly associated" with GI perforation as a complication. The answer is tocilizumab because:

It is a labelled/black-box adverse effect specific to this drug class
The mechanism (IL-6 inhibition) directly damages intestinal mucosa
Studies comparing RA biologics show tocilizumab has the highest rate of GI perforation compared to TNF inhibitors, abatacept, and others
Steroids and NSAIDs cause ulcers primarily - perforation is a downstream consequence, not the primary association

"Gastrointestinal perforation has been reported in patients receiving tocilizumab for rheumatoid arthritis." - Katzung's Basic & Clinical Pharmacology, 16th Ed.

AMC Exam Tip

When an RA patient on tocilizumab presents with acute abdomen, perforation must be your first thought - and the diagnosis may be delayed because the drug suppresses the usual inflammatory markers (CRP, fever, peritoneal signs may be blunted due to IL-6 blockade).

Final Summary - All 4 Answers

Question	Correct Answer	The One Clue That Seals It
Q1 - 6yo won't talk at school	Selective Mutism	Talks fine at home = situation-specific, not pervasive
Q2 - Bali travel, monogamous, fever + LAD + hepatosplenomegaly	EBV (Infectious Mononucleosis)	Classic triad; no rash/joints/conjunctivitis; monogamous excludes HIV
Q3 - Diplococci infection	Amoxicillin (Gram+ve) or Ceftriaxone (Gram-ve) - NOT flucloxacillin	Flucloxacillin = staph clusters, not diplococci
Q4 - RA + GI perforation on tocilizumab	Tocilizumab	IL-6 blockade = direct lower GI perforation (black-box warning)

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