NP CHRONICLES
Clinical Practice Update for NP Students
& New Graduates
Acute Tonsillitis and Pharyngitis: A Clinical Reasoning Guide
for NPs
Sore throat is one of the most common chief complaints you'll
see — here's how to separate self-limited viral illness from GAS infection,
red-flag suppurative complications, and everything in between.
Clinical Reference: Acute tonsillitis and pharyngitis, consistent with 2012 IDSA and
2009 AHA/AAP guidelines on GAS pharyngitis (updated March 2026)
Why This Topic Deserves
More Than a Quick Glance
Sore throat visits feel routine — until they aren't. Most cases
of acute tonsillitis and pharyngitis are self-limited, but the differential
ranges from a garden-variety rhinovirus to a peritonsillar abscess that needs
an ENT consult today. Knowing which patients need a swab, which need
antibiotics, and which need to go straight to the emergency department is a
core skill you'll use in nearly every primary care, urgent care, or pediatric
setting.
Tonsillitis (inflammation of the tonsils) and pharyngitis
(inflammation of the pharynx) are often discussed together — and often occur
together — but they describe distinct anatomic sites. Most cases in children
and young adults are caused by either viruses or Group A Streptococcus (GAS),
and distinguishing between the two drives everything downstream: testing,
treatment, and patient counseling.
Who Gets What, and When
•
Viral
tonsillopharyngitis accounts for the majority of cases and peaks in children
under 5 and young adults.
•
GAS
tonsillopharyngitis is most common in children aged 5–15 and is rare under age
2 — keep that in mind before you swab a toddler.
•
GAS
infection peaks in winter and spring.
•
Bacterial
causes make up roughly 15–30% of cases overall, with GAS as the dominant
pathogen; less common bacterial causes include Fusobacterium necrophorum,
Mycoplasma pneumoniae, and Neisseria gonorrhoeae.
Telling Viral and
Bacterial Apart at the Bedside
Features That Point Toward
GAS
•
Sudden
onset of fever, sore throat, and painful swallowing
•
Marked
pharyngeal or tonsillar erythema, edema, and exudates
•
Tender,
swollen anterior cervical lymph nodes
•
Palatal
petechiae
•
Notably
absent: cough
•
Scarlet
fever presentation: strawberry tongue and a fine, sandpaper-like rash
Features That Point Toward
a Virus
•
Cough,
coryza, and rhinorrhea
•
Oral
ulcers or anterior stomatitis
•
Conjunctivitis
•
Diarrhea
•
Often no
significant fever
One clinical pearl worth committing to memory: children under 3
rarely develop true GAS pharyngitis. When GAS does affect this age group, it's
more likely to show up as fever, lymphadenopathy, mucopurulent rhinitis, and
excoriated skin around the nostrils — not the classic exudative tonsillitis
picture.
Red Flags You Cannot Miss
Certain features suggest a suppurative or invasive complication
— peritonsillar abscess, retropharyngeal abscess, cervical lymphadenitis,
mastoiditis, or, rarely, sepsis — and warrant urgent evaluation rather than
routine outpatient management.
•
Trismus
(difficulty opening the mouth)
•
Drooling
•
Asymmetric
tonsils or a displaced uvula
•
Unilateral
facial swelling
•
Muffled or
“hot potato” voice
•
Any signs
of sepsis or immunosuppression
Trismus plus a change in voice quality is the classic
combination for a peritonsillar abscess — treat this as a same-day ENT
referral, not a wait-and-see.
Diagnostic Approach: Test
Smart, Not Everyone
Diagnosis is primarily clinical. Testing exists to confirm GAS
infection when the clinical picture is ambiguous — not to be applied
reflexively to every sore throat.
•
If red
flags or airway compromise are present: skip outpatient workup and move
directly to urgent management.
•
If viral
features dominate: GAS testing is not routinely indicated.
•
If
bacterial features dominate: consider a clinical scoring tool (modified Centor
score) to decide who actually needs a rapid strep test.
•
Children
under 3: routine GAS testing is not recommended given the low prevalence and
low risk of rheumatic fever in this age group, unless there's a specific
exposure risk (e.g., a household contact with confirmed GAS).
The Modified Centor Score
|
Criterion |
Finding |
Points |
|
Age |
3–14 years |
+1 |
|
|
15–44 years |
0 |
|
|
> 44 years |
−1 |
|
Tonsillar
exudate/swelling |
Yes |
+1 |
|
|
No |
0 |
|
Tender
anterior cervical nodes |
Yes |
+1 |
|
|
No |
0 |
|
Temperature
> 100.4°F (38°C) |
Yes |
+1 |
|
|
No |
0 |
|
Cough |
Absent |
+1 |
|
|
Present |
0 |
Mnemonic: M-CENTOR — Must be older than 3 years, Cough absent,
Exudate on tonsils, Node enlargement, Temperature elevation, OR young/old
(age-based point adjustment).
•
Score ≤ 1:
no further testing needed
•
Score ≥ 2:
consider rapid strep test and/or throat culture
•
Score ≥ 4:
empiric antibiotics are sometimes considered, but this remains controversial
and is not routinely recommended
A pediatric caveat worth remembering: the AAP's guidance,
aligned with IDSA, holds that clinical scoring systems like the Centor or
McIsaac criteria are not reliable enough on their own to diagnose GAS in
children. Physical exam findings alone can't reliably separate viral from
bacterial disease in this population — use the score to help triage who needs
testing, not as a substitute for it.
Rapid Strep Test and
Throat Culture
A rapid antigen detection test (RADT) is first-line in suspected
bacterial disease, with results in 5–10 minutes. A positive RADT is treated as
confirmatory. A negative RADT in children and adolescents should be followed by
a throat culture to definitively rule out GAS — this back-up culture step is
not routinely necessary in adults, given their lower risk of rheumatic fever.
Throat culture is also the right call when a patient isn't
improving after 3–4 days of antibiotics, when tonsillitis is recurrent or
chronic, or in adults with risk factors for invasive GAS disease.
Treatment: Supportive Care
First, Antibiotics With a Reason
Every patient benefits from supportive care regardless of
etiology: hydration, analgesia with acetaminophen or NSAIDs (avoid aspirin in
children due to Reye syndrome risk), and consideration of a single low-dose
corticosteroid in patients over age 3 to shorten symptom duration.
Antibiotics are reserved for laboratory-confirmed GAS infection.
The goal isn't just symptom relief — GAS is normally self-limited on its own —
it's preventing suppurative complications and, notably, acute rheumatic fever,
plus reducing transmission.
Recommended Antibiotic
Regimens for GAS Pharyngitis
|
Scenario |
Drug |
Duration |
|
No penicillin
allergy |
Penicillin V
(treatment of choice) |
10 days |
|
|
Amoxicillin |
10 days |
|
|
Benzathine
penicillin G |
Single dose |
|
Penicillin
allergy (non-anaphylactic) |
Cephalexin |
10 days |
|
|
Cefadroxil |
10 days |
|
History of
anaphylaxis to penicillin |
Clindamycin |
10 days |
|
|
Azithromycin |
5 days |
|
|
Clarithromycin |
10 days |
A practical trap to avoid: amoxicillin given empirically to a
patient with undiagnosed infectious mononucleosis can trigger a diffuse
maculopapular rash. Reserve antibiotics for confirmed bacterial disease
whenever possible, and keep EBV on your differential in an adolescent with
prominent fatigue, splenomegaly, or a negative RADT.
When Tonsillectomy Enters
the Conversation
Tonsillectomy remains one of the most common pediatric
ambulatory procedures. Indications include:
•
Severe
tonsillar hypertrophy (“kissing tonsils”) causing obstructive sleep-disordered
breathing
•
Documented
recurrent throat infections or chronic tonsillitis
•
Suspected
tonsillar neoplasm
•
Consideration
in patients with a history of peritonsillar abscess, multiple antibiotic
allergies/intolerances, or PFAPA syndrome
Defining “Recurrent”: The
Paradise Criteria
“Documented recurrent throat infections” isn't just a judgment
call — the AAO-HNS clinical practice guideline operationalizes it using the
Paradise Criteria, which set a minimum episode frequency before tonsillectomy
is considered for children ages 1–18. A child meets criteria with any one of
the following patterns:
•
≥ 7
episodes of throat infection in the past year
•
≥ 5
episodes per year in each of the past 2 years
•
≥ 3
episodes per year in each of the past 3 years
Each counted episode must be documented with at least one
objective finding: a temperature greater than 100.9°F (38.3°C), tender cervical
adenopathy, tonsillar exudate, or a positive GAS test. Note that this
temperature threshold is higher than the one used in the Modified Centor score
(100.4°F/38°C) — the two tools serve different purposes and shouldn't be
conflated.
Children who don't meet these thresholds are managed with
watchful waiting, typically for at least 12 months, before tonsillectomy is
reconsidered. Surgery may still be offered to less severely affected children
with modifying factors — multiple antibiotic allergies, a history of
peritonsillar abscess, or a family history of rheumatic fever — after
caregivers are counseled on the modest, time-limited benefit tonsillectomy
provides (improvement in throat infection frequency for roughly 1–2 years
post-surgery) weighed against surgical risk.
Post-operatively, avoid aspirin (bleeding risk) and counsel
patients on the two windows for post-tonsillectomy hemorrhage: primary bleeding
within 24 hours of surgery, and secondary bleeding roughly a week out, when the
eschar sloughs. Any visible bleeding warrants urgent ENT evaluation — this is
not a “watch and call if it worsens” situation.
Complications Worth
Remembering
Suppurative
•
Peritonsillar,
parapharyngeal, and retropharyngeal abscess
•
Otitis
media, sinusitis, mastoiditis
•
Lemierre
syndrome — septic thrombophlebitis of the internal jugular vein, classically
from Fusobacterium necrophorum, presenting with fever, neck pain, and
respiratory distress. Rare, but it's the diagnosis you don't want to miss in a
young adult who isn't getting better.
Nonsuppurative
(Post-Streptococcal)
•
Acute
rheumatic fever — the primary reason we treat confirmed GAS with antibiotics
•
Poststreptococcal
glomerulonephritis (PSGN) — antibiotic therapy does not reduce this risk,
unlike rheumatic fever
•
PANDAS —
abrupt-onset OCD and/or tic symptoms temporally linked to GAS infection in
children; uncommon, but worth knowing the pattern
Clinical Pearls for
Practice
•
Cough
presence is one of your most useful discriminators — its absence raises
suspicion for GAS, its presence favors a viral process.
•
Don't
reflexively swab children under 3 — low pretest probability means testing does
more harm than good in this group.
•
A negative
RADT in a child or teen isn't the end of the workup — send the confirmatory
throat culture.
•
Empiric
antibiotics based on Centor score alone remain controversial; when in doubt,
test before you treat.
•
Trismus +
voice change = urgent same-day referral, not a routine follow-up.
•
Watch for
the amoxicillin-mono rash trap in adolescents and young adults with atypical or
prolonged pharyngitis.
Bottom Line
Most sore throats are viral, self-limited, and need nothing more
than supportive care and good patient education about when to return. The
clinical work is in reliably identifying the minority that need testing,
antibiotics, or urgent referral — and in not over-treating everyone else. A
careful history, a quick look for red flags, and judicious use of the modified
Centor score will get you there in the vast majority of visits.
Reference
Acute tonsillitis and pharyngitis. Clinical reference consistent
with the 2012 Infectious Diseases Society of America (IDSA) guideline and the
2009 American Heart Association (AHA)/American Academy of Pediatrics (AAP)
guidelines on Group A streptococcal pharyngitis. Last updated March 2026.
NP Chronicles — Clinical education for NP
students and new graduates since 2012.
