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Acute tonsillitis — Clinical Guidelines

Overview

Acute tonsillitis is an inflammatory condition of the tonsils, commonly caused by bacterial pathogens such as Streptococcus pyogenes and Fusobacterium necrophorum, as well as viral agents. It often presents with sore throat, fever, and tonsillar exudates 1 10 11.

Diagnosis

Clinical Criteria: Sore throat, fever, tonsillar swelling, and exudates 1 10.

Laboratory Tests: Rapid antigen detection test (RADT) for Group A Streptococcus 13.

Biomarkers: Procalcitonin (PCT) and C-reactive protein (CRP) may aid in differentiating bacterial from viral causes 13.

Microbiological Culture: Essential for identifying specific pathogens, including dual infections 16 28.

Next-Generation Sequencing (NGS): Provides deeper insights into microbial involvement beyond conventional culture methods 1.

Management

First-Line Treatment: Penicillin V or amoxicillin for Group A Streptococcus infections 12 27.

Alternative Antibiotics: Erythromycin or clindamycin for penicillin-resistant strains 12.

Supportive Care: Symptomatic relief with analgesics (e.g., NSAIDs or acetaminophen) and hydration 2 7.

Monitoring for Complications: Regular assessment for signs of peritonsillar abscess or airway obstruction 3 21.

Homeopathic Remedies: Considered as adjunctive therapy in some integrative approaches, though efficacy is not well-established 14.

Special Populations

Pediatrics: Frequent use of RADT and empirical antibiotic therapy for suspected Group A Streptococcus infections 9.

Comorbidities: Increased vigilance for complications in patients with compromised immune systems 12.

Key Recommendations

Use RADT for Group A Streptococcus in pediatric patients to guide antibiotic therapy (Evidence: Moderate 9).

Consider NGS for complex cases to identify less common pathogens (Evidence: Expert opinion 1).

Monitor for signs of peritonsillar abscess in patients with severe symptoms (Evidence: Moderate 3).

Empiric antibiotic therapy should be tailored based on local resistance patterns (Evidence: Moderate 12).

Supportive care remains crucial alongside antimicrobial treatment (Evidence: Moderate 2 7).

References

1 Andersen C, Ebsen TS, Thorup CA, Reinholdt KB, Kjaerulff AMG, Udholm N et al.. Next-generation sequencing of the tonsillar microbiome in severe acute tonsillitis: comparison with healthy controls and culture-based findings. European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology 2025. link 2 Büttner R, Schwermer M, Ostermann T, Längler A, Zuzak T. Expert consensus-based clinical recommendation for an integrative anthroposophic treatment approach to acute tonsillitis in childhood. Complementary therapies in medicine 2024. link 3 Unal O, Kumbul YC, Akin V. Importance of biomarkers in streptococcal acute tonsillitis & peritonsillar abscess. The Indian journal of medical research 2024. link 4 Sørensen TL, Greve T, Klug TE. The impact of social restrictions on the incidence and microbiology of severe acute tonsillitis. Danish medical journal 2024. link 5 Findlay C, Fong WCG, Goldie S, Jones H. Implementing criteria-led discharge for acute admissions to facilitate the elective recovery from COVID-19: an example in acute tonsillitis. BMJ open quality 2023. link 6 Andersen C, Greve T, Reinholdt KB, Kjaerulff AMG, Udholm N, Khalid V et al.. Bacterial findings in patients referred to hospital for the treatment of acute tonsillitis with or without peritonsillar phlegmon. BMC infectious diseases 2023. link 7 Keskin H, Guvenmez O. A NEW TREATMENT MODALITY TO REDUCE ACUTE TONSILLITIS HEALING TIME. Journal of population therapeutics and clinical pharmacology = Journal de la therapeutique des populations et de la pharmacologie clinique 2019. link 8 Andreychyn M, Kopcha V, Klymnyuk S, Andreichyn I, Kopcha Y. THERMOSEMIOTICS OF ACUTE TONSILLITIS. Georgian medical news 2018. link 9 Chang LY, Lai CC, Chen CJ, Cho CY, Luo YC, Jeng MJ et al.. Recent trends in prescribing antibiotics for acute tonsillitis in pediatric ambulatory care in Taiwan, 2000-2009: A nationwide population-based study. Journal of microbiology, immunology, and infection = Wei mian yu gan ran za zhi 2017. link 10 Klug TE, Rusan M, Fuursted K, Ovesen T, Jorgensen AW. A systematic review of Fusobacterium necrophorum-positive acute tonsillitis: prevalence, methods of detection, patient characteristics, and the usefulness of the Centor score. European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology 2016. link 11 Kjærulff AM, Thomsen MK, Ovesen T, Klug TE. Clinical and biochemical characteristics of patients with Fusobacterium necrophorum-positive acute tonsillitis. European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery 2015. link 12 Chazan B, Raz R, Edelstein H, Kennes Y, Gal V, Colodner R. Susceptibility of Group A Streptococcus to Antimicrobial Agents in Northern Israel: A Surveillance Study. Microbial drug resistance (Larchmont, N.Y.) 2015. link 13 Christensen AM, Thomsen MK, Ovesen T, Klug TE. Are procalcitonin or other infection markers useful in the detection of group A streptococcal acute tonsillitis?. Scandinavian journal of infectious diseases 2014. link 14 Malapane E, Solomon EM, Pellow J. Efficacy of a homeopathic complex on acute viral tonsillitis. Journal of alternative and complementary medicine (New York, N.Y.) 2014. link 15 Carlson ML, Archibald DJ, Sorom AJ, Moore EJ. Under the microscope: assessing surgical aptitude of otolaryngology residency applicants. The Laryngoscope 2010. link 16 Fujimoto T, Shinohara M, Ito M, Okafuji T, Okafuji T, Nishio O et al.. Detection of dual-infected cases of adenoviruses and coxsackieviruses type B by real-time PCR but not by the conventional viral culture technique. Clinical laboratory 2007. link 17 Stenfors LE, Bye HM, Räisänen S. Noticeable differences in bacterial defence on tonsillar surfaces between bacteria-induced and virus-induced acute tonsillitis. International journal of pediatric otorhinolaryngology 2003. link00194-0) 18 Sun J, Keh-Gong W, Hwang B. Evaluation of the etiologic agents for acute suppurative tonsillitis in children. Zhonghua yi xue za zhi = Chinese medical journal; Free China ed 2002. link 19 Lilja M, Räisänen S, Stenfors LE. Initial events in the pathogenesis of acute tonsillitis caused by Streptococcus pyogenes. International journal of pediatric otorhinolaryngology 1998. link00071-8) 20 Sdralis T, Berkowitz RG. Early adenotonsillectomy for relief of acute upper airway obstruction due to acute tonsillitis in children. International journal of pediatric otorhinolaryngology 1996. link01278-8) 21 Jawad J, Blayney AW. Spontaneous tonsillar haemorrhage in acute tonsillitis. The Journal of laryngology and otology 1994. link 22 Shatz A. Spontaneous tonsillar bleeding; secondary to acute tonsillitis in children. International journal of pediatric otorhinolaryngology 1993. link90025-x) 23 Chowdhury CR, Bricknell MC. The management of quinsy--a prospective study. The Journal of laryngology and otology 1992. link 24 Stenfors LE, Räisänen S. Attachment of bacteria to tonsillar epithelium during acute tonsillitis. The Journal of laryngology and otology 1991. link 25 Stenfors LE, Räisänen S, Rantala I. In vivo attachment of group A streptococci to tonsillar epithelium during acute tonsillitis. Scandinavian journal of infectious diseases 1991. link 26 Sasaki Y, Abe H, Tokunaga E, Tsuzuki T, Fujioka T. Ciliocytophthoria (ccp) in nasopharyngeal smear from patients with acute tonsillitis. Acta oto-laryngologica. Supplementum 1988. link 27 Brook I. Role of beta-lactamase-producing bacteria in the failure of penicillin to eradicate group A streptococci. Pediatric infectious disease 1985. link 28 Brook I, Gober AE. Rapid method for detecting beta-lactamase producing bacteria in clinical specimens. Journal of clinical pathology 1984. link

Acute tonsillitis