Clinical Commander

Back to dossier
ent.pharyngitis.core.v1PRODUCTION
ent.pharyngitis.core.v1

Acute pharyngitis & tonsillitis (Centor/McIsaac, GAS vs viral, airway-emergency triage)

general_internal_medicineacutesubacuteadultpediatric
Hard-required inputs
0 / 10
Care setting:

Encounter flow

12/12 authored

Canonical 12-phase frame with authored status for this dossier.

Current phase

Frame

Detailed

Frame as a THREE-TIER decision: (1) is this an airway/deep-space emergency masquerading as sore throat (epiglottitis, peritonsillar/retropharyngeal/parapharyngeal abscess, Ludwig's angina, Lemierre's) — recognise & route OUT; (2) is this the ~5-15% GAS that benefits from antibiotics vs the viral majority; (3) is this a non-GAS bacterial cause or infectious mononucleosis. Most pharyngitis is viral and self-limited (Spinks Cochrane 2021 PMID 34881426 — 82% symptom-free by 1 wk untreated). Sepsis, abscess drainage, airway control, and the EBV long-tail are routed OUT, not authored here.

Inputs
0
Actions
0
Advance rule
Set
Advance when

pharyngitis scope confirmed; emergency/EBV/sepsis concerns routed by engine_id

Patient inputs (18)

A Centor/McIsaac component and a GAS pointer (LR+ ≈ 1.5-2.1) — but also seen in EBV/mononucleosis; scored within the rule, never weighted independently (Centor PMID 6763125; McIsaac PMID 15069046)

Tender/swollen anterior cervical adenopathy — Centor/McIsaac component; posterior-chain or generalised nodes instead pivot toward EBV (Centor PMID 6763125; Gottlieb PMID 29523424)

ABSENCE of cough is a Centor/McIsaac component (cough present argues viral); a strong score discriminator (McIsaac JAMA 2004 PMID 15069046)

Fever / history of fever >38°C is a Centor/McIsaac component and raises the GAS and the deep-space-infection prior (Centor PMID 6763125; McIsaac PMID 15069046)

McIsaac age modifier (3-14 +1; 15-44 0; ≥45 −1); GAS rare <3 y; ARF/suppurative-risk and Fusobacterium/Lemierre epidemiology are age-dependent (McIsaac JAMA 2004 PMID 15069046; IDSA 2012 Shulman PMID 22965026)

Severe odynophagia out of proportion / unable to swallow secretions raises the deep-space/airway-emergency prior and flags the corticosteroid adjunct (Gottlieb J Emerg Med 2018 PMID 29523424; de Cassan Cochrane 2020 PMID 32356360)

Trismus, drooling, muffled "hot-potato" voice, stridor, tripod posture, neck swelling/stiffness, unilateral tonsillar bulge with uvular deviation, rigors with internal-jugular tenderness — recognise then route OUT (Gottlieb J Emerg Med 2018 PMID 29523424)

Hypoxia / stridor / accelerating respiratory distress → epiglottitis/supraglottitis or deep-neck airway compromise — route OUT to the airway engine, do not instrument the throat (Gottlieb J Emerg Med 2018 PMID 29523424)

Hypotension / toxic appearance with a throat source → route OUT to id.sepsis.core.v1 (Lemierre septic emboli, toxic streptococcal/scarlet-fever picture)

True vs reported penicillin allergy gates first-line vs cephalexin (non-anaphylactic) vs azithromycin/clindamycin (IDSA 2012 Shulman PMID 22965026)

Heterophile (Monospot) / EBV serology when mononucleosis suspected — drives amoxicillin avoidance + splenic precautions (Gottlieb PMID 29523424; Dibek Misirlioglu 2018 PMID 29617685)

Contrast neck CT (or lateral soft-tissue neck) when deep-space abscess / epiglottitis suspected — defines the surgical/airway target before routing OUT (Gottlieb PMID 29523424)

Oral-sex exposure → gonococcal pharyngitis (culture on Thayer-Martin, different regimen); acute febrile sore throat + high-risk exposure → acute retroviral syndrome (HIV) (Gottlieb PMID 29523424)

Unimmunised / under-immunised + pseudomembrane → diphtheria (notifiable, antitoxin) — a vaccine-preventable mimic (Gottlieb PMID 29523424)

Rapid antigen detection test — the pivotal GAS test; specificity ~95%, sensitivity ~85-90%; positive ⇒ treat, negative ⇒ back-up culture in children (IDSA 2012 Shulman PMID 22965026; McIsaac JAMA 2004 PMID 15069046)

Throat culture — criterion standard; back-up after negative RADT in children/adolescents (higher ARF risk), not routinely after negative RADT in adults (IDSA 2012 Shulman PMID 22965026)

Atypical lymphocytosis supports EBV; marked leukocytosis with left shift supports deep-space bacterial infection (Gottlieb PMID 29523424)

Antibiotic-safety and steroid-adjunct gating for the GAS regimen (penicillin/amoxicillin safe in pregnancy; tetracyclines avoided)

* = hard-required. Engine cannot meaningfully run until these are filled.

Severity triggers (7)

7 need judgement
  • informationallife_threateningepiglottitis_supraglottitis_airway
    Rapid-onset toxic patient, severe odynophagia out of proportion to oropharyngeal findings, drooling, muffled "hot-potato" voice, stridor, tripod/sniffing posture (Gottlieb J Emerg Med 2018 PMID 29523424)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationallife_threateningludwig_angina_floor_of_mouth
    Bilateral submandibular brawny induration, elevated/protruding tongue, floor-of-mouth swelling, trismus, drooling — rapidly progressive cellulitis of the submandibular space (Gottlieb PMID 29523424)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationallife_threateninglemierre_syndrome_septic_thrombophlebitis
    Recent/persistent pharyngitis in an adolescent/young adult, rigors, unilateral anterior neck tenderness/swelling along the sternocleidomastoid, septic pulmonary emboli — Fusobacterium necrophorum internal-jugular septic thrombophlebitis (Gottlieb PMID 29523424)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalsevereperitonsillar_or_retropharyngeal_abscess
    Trismus, unilateral tonsillar/pharyngeal bulge with contralateral uvular deviation, "hot-potato" voice (peritonsillar); neck stiffness/extension refusal, drooling, retropharyngeal bulge (retropharyngeal) (Gottlieb PMID 29523424)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalsevereunable_to_swallow_secretions_or_sepsis
    Inability to swallow secretions/pooling saliva, dehydration from odynophagia, or toxic appearance / qSOFA ≥2 / hypotension with a throat source
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalmoderateinfectious_mononucleosis_avoid_amoxicillin_splenic
    Marked fatigue, posterior cervical / generalised lymphadenopathy, splenomegaly, palatal petechiae, atypical lymphocytosis — infectious mononucleosis (EBV) (Gottlieb PMID 29523424; Dibek Misirlioglu 2018 PMID 29617685)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalmoderatescarlet_fever_and_rheumatic_fever_risk
    Diffuse sandpaper rash, strawberry tongue, circumoral pallor with GAS pharyngitis (scarlet fever — toxin-mediated GAS) OR rheumatic-fever-risk population / prior ARF (Spinks Cochrane 2021 PMID 34881426; IDSA 2012 Shulman PMID 22965026)
    Trigger could not be auto-evaluated — needs clinician judgement.

Workflow calculators

Run this disease's risk and dosing calculators inline.

RISK_STRATIFICATIONrequiredDrives risk stratification
Loading…

Recommended regimen

Confirmed-GAS targeted therapy, penicillin-allergy ladder, symptomatic care, and emergency routing
axis: pharyngitis_gas_targeted_and_symptomaticstep 1 - Step 1 — Confirm GAS before any antibiotic (test-directed gate)
Selected step "Step 1 — Confirm GAS before any antibiotic (test-directed gate)" — Centor/McIsaac ≥2-3 with RADT/throat-culture positive; low-score (0-1) or RADT/culture negative → NO antibiotic, symptomatic care only
  • no_antibiotic_if_low_score_or_negative_test_symptomatic_care_only
    first line
    decision_gate
    triggers: centor_mcisaac_0_1, radt_negative, viral_features_cough_coryza
    IDSA 2012 Shulman (PMID 22965026) + ACP/CDC 2016 Harris (PMID 26785402): treat ONLY confirmed GAS; do not test/treat asymptomatic carriers. Spinks Cochrane 2021 (PMID 34881426): 82% symptom-free by 1 wk untreated; NNT to prevent one sore throat at day-3 < 6, at 1 wk ≈ 18.

outpatient playbook — drug actions (4)

  1. 1. penicillin V (confirmed GAS)
    rxcui 7984
    adult 500 mg • PO • BID-TID × 10 d
    trigger: Centor/McIsaac ≥2-3 with RADT/culture positive, no penicillin allergy (IDSA 2012 Shulman PMID 22965026)
    Treatment of choice; full 10-day course for ARF prevention
  2. 2. amoxicillin (confirmed GAS, pediatric adherence)
    rxcui 723
    50 mg/kg (max 1000 mg) once daily • PO • once daily × 10 d
    trigger: Confirmed GAS in a child, mononucleosis excluded (IDSA 2012 Shulman PMID 22965026)
    Once-daily palatable suspension improves adherence; avoid if EBV plausible (PMID 29617685)
  3. 3. cephalexin / azithromycin / clindamycin (penicillin allergy)
    rxcui 2231
    cephalexin 500 mg BID (non-anaphylactic) • PO • × 10 d (azithromycin × 5 d)
    trigger: Penicillin allergy — cephalexin if non-severe, azithromycin/clindamycin if anaphylactic (IDSA 2012 Shulman PMID 22965026)
    Allergy-stratified GAS regimen; clindamycin where macrolide resistance is a concern
  4. 4. single-dose dexamethasone (severe odynophagia adjunct)
    rxcui 3264
    0.6 mg/kg (max 10 mg) • PO • single dose
    trigger: Severe pain limiting swallowing, abscess/airway emergency excluded (de Cassan Cochrane 2020 PMID 32356360)
    Increases 24 h pain resolution RR 2.4; adjunct only

Auto-drafted A&P note

outpatient

Subjective

- Possible entry pathways: Acute sore throat / odynophagia ± fever — the dominant presentation; most viral, ~5-15% GAS (IDSA 2012 Shulman PMID 22965026; ACP/CDC 2016 Harris PMID 26785402); Tonsillar exudate + tender anterior cervical nodes + fever + no cough — high-Centor picture (Centor Med Decis Making 1981 PMID 6763125; McIsaac JAMA 2004 PMID 15069046); Sore throat WITH trismus / drooling / muffled voice / stridor / neck swelling / unilateral bulge — deep-space/airway emergency entry, route OUT (Gottlieb J Emerg Med 2018 PMID 29523424).

Objective

- No vitals, labs, or imaging entered for this encounter.

Assessment

**Acute pharyngitis & tonsillitis (Centor/McIsaac, GAS vs viral, airway-emergency triage)** (ent.pharyngitis.core.v1).
Phenotype framing: Terminal differential with pivot findings: GAS pharyngitis (high Centor/McIsaac + RADT/culture positive + no cough/coryza pivot) vs viral pharyngitis (cough, coryza, conjunctivitis, low score pivot) vs infectious mononucleosis (marked fatigue + posterior/generalised nodes + splenomegaly + atypical lymphocytes + amoxicillin-rash pivot) vs peritonsillar abscess (trismus + unilateral bulge + uvular deviation + "hot-potato" voice pivot) vs epiglottitis (rapid toxic + drooling + stridor + minimal oropharyngeal findings pivot) vs Lemierre (recent pharyngitis + rigors + unilateral neck tenderness + septic pulmonary emboli pivot) vs gonococcal/diphtheritic/scarlet-fever/acute-retroviral pharyngitis (exposure/immunisation/rash pivots)
Scope: Frame as a THREE-TIER decision: (1) is this an airway/deep-space emergency masquerading as sore throat (epiglottitis, peritonsillar/retropharyngeal/parapharyngeal abscess, Ludwig's angina, Lemierre's) — recognise & route OUT; (2) is this the ~5-15% GAS that benefits from antibiotics vs the viral majority; (3) is this a non-GAS bacterial cause or infectious mononucleosis. Most pharyngitis is viral and self-limited (Spinks Cochrane 2021 PMID 34881426 — 82% symptom-free by 1 wk untreated). Sepsis, abscess drainage, airway control, and the EBV long-tail are routed OUT, not authored here.

No severity triggers fired against current inputs.

Plan

Regimen axis: **Confirmed-GAS targeted therapy, penicillin-allergy ladder, symptomatic care, and emergency routing** — step "Step 1 — Confirm GAS before any antibiotic (test-directed gate)".
1. no_antibiotic_if_low_score_or_negative_test_symptomatic_care_only (decision_gate, first line) — IDSA 2012 Shulman (PMID 22965026) + ACP/CDC 2016 Harris (PMID 26785402): treat ONLY confirmed GAS; do not test/treat asymptomatic carriers. Spinks Cochrane 2021 (PMID 34881426): 82% symptom-free by 1 wk untreated; NNT to prevent one sore throat at day-3 < 6, at 1 wk ≈ 18.

Setting playbook (outpatient) — Apply Centor/McIsaac to decide test-vs-treat-vs-neither, treat only confirmed GAS with penicillin V/amoxicillin, give symptomatic care to the viral majority, and explicitly exclude the airway/deep-space emergency before discharge (IDSA 2012 Shulman PMID 22965026; ACP/CDC 2016 Harris PMID 26785402; McIsaac JAMA 2004 PMID 15069046)
2. penicillin V (confirmed GAS) adult 500 mg PO BID-TID × 10 d — Centor/McIsaac ≥2-3 with RADT/culture positive, no penicillin allergy (IDSA 2012 Shulman PMID 22965026) (Treatment of choice; full 10-day course for ARF prevention)
3. amoxicillin (confirmed GAS, pediatric adherence) 50 mg/kg (max 1000 mg) once daily PO once daily × 10 d — Confirmed GAS in a child, mononucleosis excluded (IDSA 2012 Shulman PMID 22965026) (Once-daily palatable suspension improves adherence; avoid if EBV plausible (PMID 29617685))
4. cephalexin / azithromycin / clindamycin (penicillin allergy) cephalexin 500 mg BID (non-anaphylactic) PO × 10 d (azithromycin × 5 d) — Penicillin allergy — cephalexin if non-severe, azithromycin/clindamycin if anaphylactic (IDSA 2012 Shulman PMID 22965026) (Allergy-stratified GAS regimen; clindamycin where macrolide resistance is a concern)
5. single-dose dexamethasone (severe odynophagia adjunct) 0.6 mg/kg (max 10 mg) PO single dose — Severe pain limiting swallowing, abscess/airway emergency excluded (de Cassan Cochrane 2020 PMID 32356360) (Increases 24 h pain resolution RR 2.4; adjunct only)

Non-pharmacologic actions:
- Symptomatic core: analgesia/antipyretic, hydration, salt-water gargle, throat lozenges (ACP/CDC 2016 Harris PMID 26785402)
- Counsel: most sore throat is viral and self-limited (~1 wk); antibiotics shorten symptoms only ~16 h (Del Mar Cochrane 2006 PMID 17054126)
- Delayed/back-up prescription strategy where score intermediate and follow-up reliable (NICE NG84)
- Return precautions: trismus, drooling, neck swelling, voice change, inability to swallow secretions, breathing difficulty → emergency reassessment (Gottlieb PMID 29523424)

AVOID / contraindication checks:
- Penicillin anaphylaxis or severe reaction block penicillinV amoxicillin and cephalexin (IDSA 2012 Shulman PMID 22965026 — use azithromycin or clindamycin)
- Avoid amoxicillin and aminopenicillins if infectious mononucleosis plausible (Dibek Misirlioglu 2018 PMID 29617685 — antibiotic associated morbilliform rash in EBV; route EBV to id.infectious mononucleosis.core.v1)
- Clindamycin c difficile counsel (IDSA 2012 Shulman PMID 22965026)
- Do not give corticosteroid as monotherapy for undrained abscess or airway emergency (de Cassan Cochrane 2020 PMID 32356360 — adjunct only)
- Do not antibiotic monotherapy a drainable deep space abscess (Gottlieb J Emerg Med 2018 PMID 29523424 — route to drainage/airway engine)
- Check local GAS macrolide resistance before azithromycin (IDSA 2012 Shulman PMID 22965026)

Monitoring

Regimen monitoring:
- clinical improvement expected within 24-48h of GAS therapy (Del Mar Cochrane 2006 PMID 17054126 — ~16 h overall symptom shortening)
- complete full 10 day GAS course even after symptom resolution ARF prevention (Spinks Cochrane 2021 PMID 34881426)
- reassess at 48-72h if not improving for evolving abscess mononucleosis Lemierre or wrong dx (Gottlieb J Emerg Med 2018 PMID 29523424)
- no routine test of cure (IDSA 2012 Shulman PMID 22965026)
- splenic rupture precautions and contact sport restriction if EBV (Gottlieb PMID 29523424)

Setting (outpatient) monitoring:
- Improvement expected within 24-48 h of GAS therapy (Del Mar Cochrane 2006 PMID 17054126)
- Reassess at 48-72 h if not improving — evolving abscess / missed mononucleosis / Lemierre / wrong dx (Gottlieb PMID 29523424)

Follow-up plan: GAS: complete the full 10-day course (rheumatic-fever-prevention rationale even after symptoms resolve — Spinks Cochrane 2021 PMID 34881426, ARF Peto OR 0.36). Test-of-cure NOT routine (IDSA 2012). RECURRENT TONSILLITIS: apply Paradise criteria (≥7 episodes/1 y, ≥5/y × 2 y, or ≥3/y × 3 y, each well-documented) → ENT referral for tonsillectomy candidacy. Post-streptococcal sequelae counselling (ARF, PSGN). Penicillin-allergy de-labelling referral for reported (non-verified) allergy. Recurrent GAS / household-source / carrier-state considerations per IDSA 2012.
- Close-out criterion: course-completion + recurrence/Paradise + sequelae-counselling plan documented

Monitoring phase: Expect clinical improvement within 24-48 h of GAS therapy; antibiotics shorten symptoms only ~16 h overall (Del Mar Cochrane 2006 PMID 17054126). Counsel that most viral sore throat resolves in ~1 week regardless (Spinks Cochrane 2021 PMID 34881426). NON-RESOLUTION or worsening at 48-72 h, new trismus/neck swelling/voice change → re-evaluate for evolving peritonsillar/deep-space abscess, missed mononucleosis, Lemierre, or wrong diagnosis before extending antibiotics.

Disposition

Current setting: outpatient — Apply Centor/McIsaac to decide test-vs-treat-vs-neither, treat only confirmed GAS with penicillin V/amoxicillin, give symptomatic care to the viral majority, and explicitly exclude the airway/deep-space emergency before discharge (IDSA 2012 Shulman PMID 22965026; ACP/CDC 2016 Harris PMID 26785402; McIsaac JAMA 2004 PMID 15069046)

Disposition criteria:
- Discharge with symptomatic care ± GAS antibiotic + return precautions if no emergency features (IDSA 2012 Shulman PMID 22965026)
- No antibiotic if low Centor/McIsaac or negative test (ACP/CDC 2016 Harris PMID 26785402)
- Refer ENT for tonsillectomy assessment if Paradise recurrent-tonsillitis criteria met

Escalation triggers (move to higher acuity):
- Airway/deep-space red flag → ED, route to ent.epiglottitis.core.v1 / ent.peritonsillar-abscess.core.v1 / ent.deep-neck-space-infection.core.v1 (Gottlieb PMID 29523424)
- Toxic / hypotensive / qSOFA ≥2 → route to id.sepsis.core.v1
- Persistent/worsening sore throat in a 15-30 y patient with rigors + unilateral neck tenderness → Lemierre — route to ent.deep-neck-space-infection.core.v1 (Gottlieb PMID 29523424)

Earlier-Return Triggers

Return-precaution thresholds (watch for):
- [LIFE_THREATENING] Rapid-onset toxic patient, severe odynophagia out of proportion to oropharyngeal findings, drooling, muffled "hot-potato" voice, stridor, tripod/sniffing posture (Gottlieb J Emerg Med 2018 PMID 29523424)
- [LIFE_THREATENING] Bilateral submandibular brawny induration, elevated/protruding tongue, floor-of-mouth swelling, trismus, drooling — rapidly progressive cellulitis of the submandibular space (Gottlieb PMID 29523424)
- [LIFE_THREATENING] Recent/persistent pharyngitis in an adolescent/young adult, rigors, unilateral anterior neck tenderness/swelling along the sternocleidomastoid, septic pulmonary emboli — Fusobacterium necrophorum internal-jugular septic thrombophlebitis (Gottlieb PMID 29523424)

Citations

- IDSA 2012 Clinical Practice Guideline — Diagnosis & Management of Group A Streptococcal Pharyngitis (Shulman et al, CID, PMID 22965026) + ACP/CDC 2016 Appropriate Antibiotic Use for ARTI in Adults (Harris, Ann Intern Med, PMID 26785402) + NICE NG84 Sore throat (acute) 2018 (FeverPAIN/Centor) + Centor 1981 / McIsaac 2004 score validation (PMID 6763125, 15069046) + Cochrane antibiotics for sore throat (Spinks 2021 PMID 34881426; Del Mar 2006 PMID 17054126) + Cochrane corticosteroids for sore throat (de Cassan 2020 PMID 32356360) [PMID:22965026](https://pubmed.ncbi.nlm.nih.gov/22965026/)
- Cited evidence (PMID 26785402) [PMID:26785402](https://pubmed.ncbi.nlm.nih.gov/26785402/)
- Cited evidence (PMID 34881426) [PMID:34881426](https://pubmed.ncbi.nlm.nih.gov/34881426/)
- Cited evidence (PMID 17054126) [PMID:17054126](https://pubmed.ncbi.nlm.nih.gov/17054126/)
- Cited evidence (PMID 6763125) [PMID:6763125](https://pubmed.ncbi.nlm.nih.gov/6763125/)

Last reconciled with current guidelines: 2026-05-17.
References
  • IDSA 2012 Clinical Practice Guideline — Diagnosis & Management of Group A Streptococcal Pharyngitis (Shulman et al, CID, PMID 22965026) + ACP/CDC 2016 Appropriate Antibiotic Use for ARTI in Adults (Harris, Ann Intern Med, PMID 26785402) + NICE NG84 Sore throat (acute) 2018 (FeverPAIN/Centor) + Centor 1981 / McIsaac 2004 score validation (PMID 6763125, 15069046) + Cochrane antibiotics for sore throat (Spinks 2021 PMID 34881426; Del Mar 2006 PMID 17054126) + Cochrane corticosteroids for sore throat (de Cassan 2020 PMID 32356360) — PMID:22965026
  • Cited evidence (PMID 26785402) — PMID:26785402
  • Cited evidence (PMID 34881426) — PMID:34881426
  • Cited evidence (PMID 17054126) — PMID:17054126
  • Cited evidence (PMID 6763125) — PMID:6763125