Continuing Education Activity

Tonsillitis is a common inflammatory condition affecting the palatine tonsils, accounting for approximately 1.3% of outpatient visits. The condition is typically caused by viral or bacterial infections and manifests with symptoms such as sore throat, fever, odynophagia, and tonsillar erythema or exudate. Viral tonsillitis is often self-limiting; however, bacterial causes—most notably group A Streptococcus—can lead to significant complications, including peritonsillar abscess, acute rheumatic fever, and poststreptococcal glomerulonephritis. Prompt and accurate diagnosis is essential to distinguish viral from bacterial etiologies. Clinical scoring systems, such as the Centor or McIsaac criteria and microbiological testing, help guide appropriate management and reduce unnecessary antibiotic use. Early identification and intervention are critical to preventing complications and promoting effective recovery.

This educational activity provides evidence-based guidance on the diagnosis and treatment of tonsillitis, emphasizing current recommendations for antimicrobial therapy and criteria for surgical referral. Learners gain knowledge of validated diagnostic tools and the principles of antimicrobial stewardship. The course highlights the role of interprofessional collaboration—among clinicians, nurses, pharmacists, and laboratory personnel—in improving diagnostic accuracy, optimizing treatment plans, and reducing unnecessary interventions. Through coordinated care, healthcare professionals enhance patient-centered outcomes and reduce the burden on healthcare systems by avoiding overtreatment and limiting the development of antimicrobial resistance.

Objectives:

• Identify common viral and bacterial pathogens responsible for tonsillitis, including high-risk cases caused by group A Streptococcus.
• Differentiate between viral and bacterial tonsillitis using validated clinical criteria and diagnostic tools.
• Implement evidence-based treatment strategies, including appropriate antibiotic selection and duration.
• Communicate effectively with patients affected by tonsillitis and their families about treatment plans, prognosis, and indications for tonsillectomy.

Introduction

Tonsillitis is inflammation of the palatine tonsils and typically presents with sore throat, odynophagia, fever, and erythematous or exudative tonsils. This condition causes frequent healthcare visits worldwide, comprising approximately 1.3% of outpatient encounters.[1] The palatine tonsils in the lateral oropharynx between the palatoglossal and palatopharyngeal arches comprise lymphoid tissue and are a key component of the Waldeyer ring.[2][3] These structures serve as a first-line immunologic barrier against inhaled or ingested pathogens.[2][3][4] See Image. Tonsillitis.

Acute tonsillitis is typically infectious in origin and diagnosed clinically. Viral pathogens are responsible for 70% to 95% of cases, while bacterial pathogens—particularly Streptococcus pyogenes (group A Streptococcus [GAS])—account for 5% to 15% of adult cases and 15% to 30% of pediatric cases, especially in children aged 5 to 15.[5][6] Timely differentiation between viral and bacterial tonsillitis is essential to guide appropriate antimicrobial use and reduce unnecessary antibiotic prescriptions. This distinction is crucial, as streptococcal tonsillitis can lead to complications such as peritonsillar abscess, acute rheumatic fever, and poststreptococcal glomerulonephritis.[7][8]

Etiology

Tonsillitis is primarily caused by infectious agents, with viral pathogens accounting for most cases (approximately 70%–95%).[5][6] Common viral etiologies include rhinovirus, respiratory syncytial virus, adenovirus, coronavirus, Epstein–Barr virus (EBV), cytomegalovirus, and human immunodeficiency virus.[9] These viruses manifest as part of broader upper respiratory tract infections, although systemic viruses like EBV may produce more severe or prolonged illness.[5][6]

Although less common, bacterial causes of tonsillitis are clinically significant due to their potential for complications. Group A beta-hemolytic Streptococcus, or S pyogenes, is the most prevalent bacterial pathogen, particularly in children aged 5 to 15.[10][11] Other implicated organisms include Staphylococcus aureus, Streptococcus pneumoniae, Haemophilus influenzae, Fusobacterium necrophorum (notably in adolescents and young adults), and Streptococcus dysgalactiae.[11][12]

Less common bacterial pathogens include Mycoplasma pneumoniae, Chlamydophila pneumoniae, and Neisseria gonorrhoeae, particularly in sexually active individuals.[10] Corynebacterium diphtheriae should be considered in unvaccinated individuals. Mycobacterium tuberculosis has also been implicated in chronic or recurrent tonsillitis, particularly in high-risk populations.[8][13][14] Recurrent tonsillitis is often polymicrobial, with biofilm-forming organisms such as S aureus and H influenzae contributing to its persistence.[15] Alterations in the tonsillar microbiota and reduced microbial diversity (dysbiosis) have also been associated with recurrence.[13][16]

Epidemiology

Tonsillitis is a common cause of outpatient visits, accounting for approximately 2% of ambulatory encounters in the United States.[17] While it can occur year-round, incidence peaks in winter and early spring.[17][18] Group A beta-hemolytic Streptococcus (GABHS) is the leading bacterial cause of tonsillitis in certain age groups, accounting for 15% to 30% of cases in children aged 5 to 15 and 5% to 15% in adults.

In contrast, viral pathogens predominate in children younger than 5, and GABHS is uncommon in those younger than 2.[17] A recent trend in some regions shows a rise in hospital admissions for severe or complicated tonsillitis, potentially linked to declining tonsillectomy rates following the adoption of stricter surgical criteria.[17] Recurrent tonsillitis, defined as 5 or more episodes annually, is associated with significant morbidity and reduced quality of life.[19]

History and Physical

Tonsillitis typically presents with the sudden onset of sore throat, fever, odynophagia, and pharyngeal erythema. Additional symptoms may include malaise, headache, halitosis, and a muffled ("hot potato") voice.[19]

 Key Physical Examination Findings

• Tonsillar erythema, hypertrophy, or purulent exudates [20]
• Tender anterior cervical lymphadenopathy
• Palatal petechiae
• Fever >38 °C/100.4 °F
• Absence of cough (supports bacterial etiology)[20]
• Uvular deviation (may indicate peritonsillar abscess)

Posterior cervical lymphadenopathy and splenomegaly suggest EBV infection, while a fine, sandpaper-like (scarlatiniform) rash may indicate GAS pharyngitis. Trismus, asymmetric tonsillar enlargement, or external neck swelling should raise suspicion for complications such as peritonsillar or deep neck space abscess.[19]

Historical Clues of Diagnostic Value

The clinical history should assess:

• Duration and severity of symptoms
• Presence of viral features (eg, cough, rhinorrhea, conjunctivitis)
• History of recurrent tonsillitis or similar episodes
• Immunocompromised status or chronic illnesses
• Recent sexual activity if sexually transmitted infections are suspected [19]

Evaluation

Tonsillitis is primarily diagnosed clinically, though structured scoring systems and microbiological testing can help distinguish bacterial from viral etiologies.[6][20] Tools such as the Centor and FeverPAIN (fever in the past 24 hours, purulence, attend rapidly [within 3 days], inflamed tonsils, and no cough or coryza) scores improve diagnostic accuracy and guide the need for further testing or antibiotic therapy.

Clinical Scoring Tools

The Centor score is a clinical tool used to estimate the likelihood of GAS pharyngitis based on criteria such as tonsillar exudates, tender anterior cervical lymphadenopathy, fever, and absence of cough (see Table. The Centor Score). Each positive finding contributes 1 point; a higher score increases the probability of bacterial infection and can guide decisions on testing or empiric antibiotic treatment.[21]

Table

Table. The Centor Score.

The McIsaac modification of the Centor score adjusts the original criteria by incorporating patient age, improving its applicability across a broader population (see Table. McIsaac Modification). This modification increases diagnostic accuracy, particularly in children and older adults. The total score helps determine the likelihood of streptococcal infection and whether testing or treatment is warranted (see Table. Interpretation of McIsaac Score).

Table

Table. McIsaac Modification.

Table

Table. Interpretation of McIsaac Score.

The FeverPAIN score, commonly used in the United Kingdom, evaluates 5 criteria: fever, purulence, rapid symptom onset, inflamed tonsils, and absence of cough; this aligns with the National Institute for Health and Care Excellence guidelines and promotes rational antibiotic use.[7]

Microbiological Testing

Microbiological confirmation helps differentiate bacterial from viral tonsillitis, especially in suspected cases of group GABHS infection. Accurate identification of the causative agent supports targeted treatment and helps prevent unnecessary antibiotic use. 

• Rapid antigen detection test Rapid antigen detection test (RADT) offers high specificity (88%–100%) but variable sensitivity (61%–95%) in children. A positive result supports the diagnosis of streptococcal pharyngitis, while a negative result in high-suspicion pediatric cases should be followed by further testing.

• Throat culture Considered the gold standard for diagnosing GABHS, particularly in children with negative RADT results but high clinical suspicion. Per the Infectious Diseases Society of America guidelines, cultures are essential before initiating antibiotics.[6][22][23]

Testing considerations for tonsillitis should consider patient age, clinical presentation, and risk factors. Routine testing is generally not recommended in children under 3 years due to the low risk of streptococcal complications such as rheumatic fever.[6] Monospot or EBV serology is useful in suspected infectious mononucleosis. Nucleic acid amplification test or culture for Neisseria gonorrhoeae or Chlamydia trachomatis should be considered in sexually active individuals. Human immunodeficiency virus and rapid plasma reagin testing may be warranted in patients with atypical symptoms or high-risk exposures.[24]

Laboratory and Imaging Studies

Laboratory and imaging studies are not routinely required for uncomplicated tonsillitis, but may be warranted in select cases to assess for complications or alternative diagnoses. These investigations can help identify systemic involvement, confirm suspected pathogens, or evaluate for deep neck space infections. Clinical judgement should guide their use based on severity, duration, and associated findings. 

• Laboratory tests: Routine blood work, such as a complete blood count or metabolic panel, is typically unnecessary in uncomplicated tonsillitis. However, these tests may help evaluate patients with systemic toxicity or dehydration, or when considering alternative diagnoses.

• Imaging studies: Imaging is reserved for cases where complications are suspected. 

  • Peritonsillar abscess
  • Retropharyngeal or deep neck space infections
  • Signs of airway compromise (eg, stridor, drooling, trismus)

Computed tomography (CT) of the neck is the preferred modality, offering high sensitivity for detecting deep space infections and delineating abscess extent. In some cases, ultrasound may be considered an initial modality, especially in children or when CT is not readily available.

Treatment / Management

Managing tonsillitis depends on the underlying etiology, severity of symptoms, and risk of complications. Most cases are viral and self-limiting, requiring only supportive care. Bacterial infections, particularly those caused by GAS, may warrant antibiotic therapy to reduce symptom duration and prevent complications.

Supportive Care

Most cases of tonsillitis are viral and self-limiting, requiring only symptomatic management. Recommended measures include adequate hydration, rest, and analgesics such as acetaminophen or nonsteroidal anti-inflammatory drugs.[25][26] Throat lozenges and warm salt-water gargles may provide additional relief. Topical agents like viscous lidocaine are occasionally used, though supporting evidence remains limited.[27] Herbal remedies and zinc gluconate have demonstrated inconsistent benefits and are generally not recommended.[27] 

Adjunctive Corticosteroids

A single dose of corticosteroids (eg, dexamethasone) may accelerate symptom resolution and provide short-term pain relief, particularly in patients with severe odynophagia.[28] Use should be individualized, especially in patients with diabetes or immunocompromised states, where potential risks may outweigh the benefits.[28] 

Antibiotic Therapy

Antibiotics are indicated for confirmed or strongly suspected bacterial tonsillitis, most commonly caused by GAS.[29] First-line regimens include:

• Penicillin V or amoxicillin for 10 days
• Azithromycin, clarithromycin, or first-generation cephalosporins for patients with nonanaphylactic penicillin allergies [23][29][30]

While antibiotics may shorten symptom duration by approximately 16 hours, their primary benefit is the prevention of complications such as peritonsillar abscess and acute rheumatic fever, particularly in high-risk populations (eg, Indigenous Australians or underserved communities).[31][32] Potential risks include gastrointestinal upset, Clostridioides difficile infection, antibiotic resistance, and increased healthcare costs.[27][30] Chronic GAS carriers typically do not require treatment due to low transmission and complication risks.[33] Current Centers for Disease Control and Prevention and American College of Physicians guidelines recommend antibiotic therapy only when GAS is confirmed by rapid antigen detection testing or throat culture.[33] A delayed prescription or watchful waiting approach may be appropriate in low-risk cases.

Chronic Versus Recurrent Tonsillitis

Chronic tonsillitis is associated with an increased risk of developing immunoglobulin A nephropathy and may also be linked to Helicobacter pylori infection, suggesting broader systemic and local health implications.[34][35] Persistent inflammation and immune activation in chronic tonsillitis may contribute to these extra-tonsillar effects. Recurrent tonsillitis is often defined as 5 or more episodes annually.[36][37][38] Evaluation should include assessment for underlying conditions such as immunodeficiency. Medical therapy guidelines are as follows:

• Clindamycin or amoxicillin-clavulanate may be superior to penicillin in eradicating GAS in recurrent cases.[39]
• Prophylactic antibiotics such as long-acting benzathine penicillin or low-dose azithromycin can reduce recurrence frequency. Azithromycin is often preferred in children due to better adherence.[19][39][40][41]

Surgical Management

Tonsillectomy is indicated in patients with recurrent or chronic tonsillitis when the frequency or severity of episodes significantly impacts quality of life.[42] This surgery may also be considered when a patient is unresponsive to medical therapy or complications such as peritonsillar abscess recur. The Paradise criteria are evidence-based guidelines for determining eligibility for tonsillectomy in children with recurrent throat infections due to GAS. To meet the Paradise criteria for tonsillectomy, a child should have:

• ≥7 episodes of throat infection in 1 year, or
• ≥5 episodes annually for 2 consecutive years, or
• ≥3 episodes annually for 3 consecutive years [11]

Each episode must be well-documented and meet specific clinical features, including:

• Sore throat plus 1 or more of the following:

  • Fever ≥38.3 °C (101 °F)
  • Cervical lymphadenopathy (tender or >2 cm nodules)
  • Tonsillar exudate
  • Positive test for GABHS

The American Academy of Otolaryngology–Head and Neck Surgery notes that tonsillectomy offers short-term benefits, including reduced sore throat episodes and fewer school or work absences.[11] However, evidence supporting long-term benefits remains limited. The National Trial of Tonsillectomy in Adults trial demonstrated that adults undergoing tonsillectomy for 3 to 5 episodes per year experienced significantly fewer sore throat days and improved quality of life compared to those managed conservatively.[20] However, these benefits were offset by increased postoperative risks, most notably hemorrhage.

The Centers for Disease Control and Prevention and the American College of Physicians advise against tonsillectomy solely to reduce the frequency of GAS pharyngitis in adults.[19] Surgical decisions should be individualized, considering symptom severity, recurrence rate, and patient preferences. Judicious antibiotic use and adherence to evidence-based surgical criteria are essential to minimize complications, limit antimicrobial resistance, and reduce healthcare burden. Patient education and clinician awareness are critical to supporting guideline-concordant care and improving outcomes.

Guideline-Based Recommendations

Current clinical guidelines underscore the importance of accurate diagnosis, responsible antibiotic use, and clearly defined surgical indications to manage tonsillitis. These recommendations aim to balance effective treatment with preventing overtreatment and associated risks.

Infectious Diseases Society of America, 2012 Update on Streptococcal Pharyngitis 

This guideline outlines best practices for diagnosing and managing GAS pharyngitis and recommends microbiological confirmation using RADT or throat culture before initiating antibiotic therapy. Penicillin or amoxicillin is recommended as first-line treatment.

European Society for Clinical Microbiology and Infectious Diseases, 2012 Guideline for Acute Sore Throat

The European Society for Clinical Microbiology and Infectious Diseases promotes an evidence-based approach, using clinical scoring systems such as Centor or FeverPAIN in conjunction with RADT to guide antibiotic prescribing. Antibiotic use is discouraged in low-risk cases, and the modest benefit of antibiotics in more severe presentations is stressed. 

American Academy of Otolaryngology–Head and Neck Surgery, 2019 Clinical Practice Guideline: Tonsillectomy in Children (Update)

This updated guideline delivers evidence-based recommendations for tonsillectomy in pediatric patients. Preoperative, intraoperative, and postoperative management, focusing on indications such as recurrent throat infections and obstructive sleep-disordered breathing, are addressed. The guideline also highlights the importance of shared decision-making between clinicians and caregivers.

Differential Diagnosis

The clinical presentation of tonsillitis can overlap with several other conditions affecting the oropharynx and upper respiratory tract. A thorough evaluation is essential to distinguish tonsillitis from other infectious, inflammatory, or systemic causes of pharyngitis (see Table. Differential Diagnosis of Tonsillitis). Accurate diagnosis ensures appropriate management and helps avoid unnecessary antibiotic use or missed pathology. 

Table

Table. Differential Diagnosis of Tonsillitis.

Prognosis

The prognosis of acute tonsillitis is generally excellent, especially in otherwise healthy individuals. Most cases, particularly viral, are self-limiting and resolve within 2 to 8 days. Fever typically subsides within 2 to 3 days, and supportive care is sufficient for most patients.[5][6] In bacterial tonsillitis caused by GABHS, prompt antibiotic therapy shortens symptom duration, reduces transmissibility, and helps prevent complications such as acute rheumatic fever and peritonsillar abscess.[47] Timely treatment is essential in high-risk populations to minimize morbidity and long-term sequelae.

While not usually life-threatening, recurrent tonsillitis can significantly impair quality of life, causing frequent school or work absences and sleep disturbances. Patients who meet criteria and undergo tonsillectomy may experience symptomatic relief, although the long-term benefits can be variable.[48] Nonsuppurative complications of GABHS, such as acute rheumatic fever and poststreptococcal glomerulonephritis, have become rare in high-income countries due to early antibiotic treatment. However, they remain a concern in low-resource settings.[49]

If symptoms persist or worsen despite standard treatment, clinicians must consider alternative or coexisting diagnoses such as:

• Infectious mononucleosis
• Human immunodeficiency virus
• Tuberculosis
• Gonorrhea
• Syphilis
• Kawasaki disease
• Deep space infections (eg, peritonsillar or retropharyngeal abscess, Lemierre syndrome)

When tonsillitis is appropriately managed, the outcome is excellent, whether viral or bacterial. Complications are uncommon in modern clinical practice with proper diagnostic evaluation and treatment.

Complications

While tonsillitis is usually self-limited with a favorable prognosis, local and systemic complications can occur, particularly when caused by GABHS or delayed treatment.[45] Early recognition and appropriate management are essential to prevent adverse outcomes and ensure optimal patient recovery.

Local Complications

Local complications of tonsillitis arise when infection extends beyond the tonsillar tissue into adjacent structures. Though uncommon with timely treatment, these complications can be serious and require prompt recognition and intervention.

• Peritonsillar abscess (quinsy)

  • This is the most common suppurative complication of tonsillitis, characterized by pus accumulation between the tonsillar capsule and pharyngeal constrictor muscle.[41][50] This condition typically presents with unilateral sore throat, trismus, uvular deviation, and a muffled “hot potato” voice. Most cases are polymicrobial, with risk factors including smoking and prior tonsillitis. Treatment involves needle aspiration, incision, drainage, and antibiotics and corticosteroids.[51][47] In a few instances, patients develop suppurative tonsillitis and necrotizing tonsillitis caused by S pyogenes superinfection in a patient with EBV-associated mononucleosis.[52][53] The Pediatric Appropriate Antibiotic Therapy–1 is the first validated patient-reported tool to assess symptom severity, duration, and treatment efficacy in peritonsillar abscess from the patient’s perspective.[54][55]
• Deep space infections

  • Infection may extend to adjacent fascial planes, leading to retropharyngeal or parapharyngeal abscesses, which can cause airway compromise, septicemia, or descending necrotizing mediastinitis—conditions with high morbidity and mortality.[48][49][56][57][58][59]
• Airway Obstruction

  • This is seen predominantly in children with significant tonsillar hypertrophy, leading to partial or complete airway compromise.[60]
• Tonsillar hemorrhage

  • This rare event results from erosion into nearby blood vessels, often triggered by trauma, inflammation, or infection.[60] 

Systemic Complications

Systemic complications of tonsillitis occur when the infection triggers immune-mediated responses or spreads beyond the oropharynx. Though rare in high-resource settings, conditions such as acute rheumatic fever and poststreptococcal glomerulonephritis remain important considerations, particularly in untreated or high-risk individuals. 

• Acute rheumatic fever

  • This is an autoimmune complication of GABHS pharyngitis, typically affecting children aged 5 to 18. Clinical signs include migratory arthritis, carditis (especially mitral valve involvement), Sydenham chorea, subcutaneous nodules, and erythema marginatum. While uncommon in high-income countries, it remains prevalent in resource-limited settings.[46]
• Poststreptococcal glomerulonephritis

  • This is an immune-mediated renal condition following GABHS infection. Presents with hematuria, edema, hypertension, and low complement levels. Prognosis is generally favorable in children, but outcomes may worsen in older individuals.[24]
• Lemierre syndrome

  • This syndrome is a rare but serious condition caused by Fusobacterium necrophorum, involving septic thrombophlebitis of the internal jugular vein. This condition typically presents with fever, neck pain, and signs of septic emboli, most commonly to the lungs. Complications can include ARDS, osteomyelitis, and meningitis.[49]
• Scarlet fever

  • This toxin-mediated illness from GABHS is characterized by a fine sandpaper-like rash and a “strawberry” tongue and may coexist with streptococcal tonsillitis.[45]
• Acute myopericarditis

  • Though rare, this condition has been reported in young males with severe bacterial tonsillitis, particularly those presenting with chest pain.[47]
• Other rare complications

  • These include sepsis, necrotizing fasciitis, superior sagittal sinus thrombosis, and Guillain-Barré syndrome, particularly in immunocompromised individuals.[60]

Deterrence and Patient Education

Effective patient education is a cornerstone in managing tonsillitis, particularly in curbing unnecessary antibiotic use and alleviating the overall burden on healthcare systems. Clinicians should communicate that most cases of tonsillitis are viral and self-limiting, resolving without the need for antimicrobial therapy.[45] Using structured clinical decision tools, such as the Centor and McIsaac criteria, can help stratify the likelihood of GAS infection. These tools also support shared decision-making by providing a clear rationale for diagnostic testing or withholding antibiotics.[45]

While antibiotics may modestly reduce symptom duration in GAS tonsillitis (typically by less than 24 hours), their primary benefit lies in preventing complications such as peritonsillar abscess and acute rheumatic fever, which have become uncommon in high-income countries.[45] Nevertheless, patients must be informed of the potential risks associated with antibiotic use, including gastrointestinal side effects, allergic reactions, Clostridioides difficile infection, and antimicrobial resistance.[45]

Pearls and Other Issues

Key facts to keep in mind about tonsillitis include the following:

• Tonsillitis is most commonly viral, and supportive care remains the cornerstone of treatment. Avoid unnecessary antibiotics in low-risk individuals.
• GABHS is the primary bacterial cause; Centor or McIsaac criteria guide testing and antibiotic decisions.
• RADTs have high specificity but variable sensitivity; in high-suspicion cases, particularly in children, follow up with a throat culture.
• Consider EBV (infectious mononucleosis) in adolescents and young adults with significant fatigue, posterior cervical lymphadenopathy, or hepatosplenomegaly.
• Watch for complications such as peritonsillar abscess, retropharyngeal abscess, Lemierre syndrome, and airway compromise—these require urgent escalation of care. 
• Corticosteroids (eg, dexamethasone) can offer rapid symptom relief in severe cases but should be used judiciously, particularly in patients with diabetes or immunosuppression. 
• Antibiotics modestly reduce symptom duration and primarily serve to prevent rheumatic fever, glomerulonephritis, and suppurative complications in high-risk populations. 
• Recurrent tonsillitis should prompt evaluation for surgical referral; tonsillectomy is considered based on established frequency thresholds and impact on quality of life.
• Patient education is essential. Discuss the expected disease course, treatment rationale, and signs of complications to reduce unnecessary return visits and promote adherence.
• Maintain a high index of suspicion for rare but serious diagnoses (eg, human immunodeficiency virus, tuberculosis, diphtheria, gonococcal pharyngitis) in appropriate clinical contexts or high-risk populations.

Enhancing Healthcare Team Outcomes

Effective management of tonsillitis relies on a coordinated interprofessional approach involving clinicians, nurses, pharmacists, radiologists, and specialists. Primary care clinicians serve as the initial point of contact, utilizing validated clinical tools (eg, Centor or McIsaac criteria) to differentiate viral from bacterial etiologies and guide appropriate antibiotic use. Shared decision-making is essential, particularly in discussing risks, benefits, and antibiotic stewardship.[45]

Nurses contribute through patient education, monitoring, and care coordination.[61] Pharmacists ensure appropriate antibiotic selection, dosing, and adherence counseling. Radiologists assist in identifying complications, such as deep neck space infections, through context-informed imaging interpretation. Specialist input—including otolaryngology, infectious disease, and nephrology—is warranted in recurrent or atypical cases.

Evidence of treatment effectiveness includes multiple large randomized controlled trials and Cochrane reviews supporting antibiotic use in confirmed GAS tonsillitis. The decision-to-treat model, including the Centor criteria, has been validated in several extensive studies for its diagnostic utility and risk stratification.[45][47] While high-level evidence supports these practices, rare conditions such as Lemierre syndrome and tuberculous tonsillitis are guided primarily by Level 5 evidence from case reports and expert opinion. Collaborative communication and role clarity across the care continuum are essential to achieving accurate diagnoses, timely interventions, and improved patient outcomes. Interdisciplinary coordination also helps minimize delays, reduce redundancies, and ensure that care is aligned with best practices and patient needs.

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Disclosure: Bala Nimmana declares no relevant financial relationships with ineligible companies.

Disclosure: Elizabeth Paterek declares no relevant financial relationships with ineligible companies.