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Infectious mononucleosis — Clinical Guidelines

Overview

Infectious mononucleosis, commonly known as "mono," is a lymphoproliferative disorder primarily caused by the Epstein-Barr virus (EBV), affecting predominantly adolescents and young adults with symptoms including fever, pharyngitis, lymphadenopathy, and fatigue 1 2.

Diagnosis

Clinical Presentation: Fever, sore throat, lymphadenopathy, and fatigue 1 2.

Laboratory Tests: Elevated white blood cell count with atypical lymphocytes, positive heterophile antibodies (Monospot test) 9 18.

Differential Diagnosis: Exclude streptococcal pharyngitis and other causes of tonsillitis using throat cultures and nasopharyngeal endoscopy 18 28.

Serological Testing: Confirm EBV infection via serological tests for EBV-specific antibodies 8 38.

Management

Supportive Care: Rest, hydration, analgesics (e.g., acetaminophen), and antipyretics 1 2.

Corticosteroids: Consider for severe symptoms like airway obstruction or peritonsillar abscess, though evidence is mixed regarding their role in preventing abscess formation 13 20.

Antibiotics: Not routinely indicated unless secondary bacterial infection is suspected 5 25.

Activity Restriction: Avoid strenuous activities and sports until full recovery to prevent splenic rupture 11 14.

Special Populations

Pediatrics: Classic presentation is uncommon; severe pharyngotonsillitis can occur 29.

Comorbidities: Monitor for complications like splenic rupture, especially in those with pre-existing conditions 16 35.

Key Recommendations

Use Monospot Test for Diagnosis: Positive Monospot test strongly supports the diagnosis of infectious mononucleosis (Evidence: Strong 9).

Supportive Care is Essential: Focus on rest, hydration, and symptomatic relief to manage fever and pain (Evidence: Moderate 1 2).

Consider Corticosteroids for Severe Symptoms: Use corticosteroids judiciously in cases of significant airway obstruction or peritonsillar abscess, despite mixed evidence (Evidence: Moderate 13 20).

Avoid Premature Return to Physical Activities: Delay return to strenuous activities until full recovery to minimize risk of splenic rupture (Evidence: Expert opinion).

Monitor for Complications: Closely observe for signs of severe complications such as splenic rupture and upper airway obstruction, particularly in high-risk individuals (Evidence: Moderate 16 35).

References

1 Scannapiecoro S, Indolfi G, Temperino V, Trapani S. Hypoglossal nerve palsy in infectious mononucleosis and Fusobacterium necrophorum tonsillitis: a case report and literature review. Italian journal of pediatrics 2025. link 2 Wang C, Duan L, Li P, Zhao W, Cao X. A case of suppurative tonsillitis as a complication of acute infectious mononucleosis. Science progress 2025. link 3 Rostgaard K, Stensballe LG, Søegaard SH, Kamper-Jørgensen M, Hjalgrim H. Childcare attendance and risk of infectious mononucleosis: A population-based Danish cohort study. PloS one 2021. link 4 Levi JM, Nassif SJ, Shetty K, McKee-Cole KM, Barth PC. A pilot study on pediatric mononucleosis presenting with abscess. American journal of otolaryngology 2020. link 5 Danstrup CS, Klug TE. Low rate of co-infection in complicated infectious mononucleosis. Danish medical journal 2019. link 6 Lennon P, Saunders J, Fenton JE. A longer stay for the kissing disease: epidemiology of bacterial tonsillitis and infectious mononucleosis over a 20-year period. The Journal of laryngology and otology 2013. link 7 Piessens P, Indesteege F, Lemkens P. Alice in Wonderland syndrome and upper airway obstruction in infectious mononucleosis. B-ENT 2011. link 8 Ahmad UA, Anari S. Infectious mononucleosis screening in quinsy patients. 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 2010. link 9 McCormack R, O'Shea T. The uptake and use of the Monospot test in patients with tonsillitis. Irish medical journal 2009. link 10 Petersen I, Thomas JM, Hamilton WT, White PD. Risk and predictors of fatigue after infectious mononucleosis in a large primary-care cohort. QJM : monthly journal of the Association of Physicians 2006. link 11 Waninger KN, Harcke HT. Determination of safe return to play for athletes recovering from infectious mononucleosis: a review of the literature. Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine 2005. link 12 Auwaerter PG. Infectious mononucleosis: return to play. Clinics in sports medicine 2004. link 13 Hanna BC, McMullan R, Hall SJ. Corticosteroids and peritonsillar abscess formation in infectious mononucleosis. The Journal of laryngology and otology 2004. link 14 Kinderknecht JJ. Infectious mononucleosis and the spleen. Current sports medicine reports 2002. link 15 Stenfors LE, Bye HM, Räisänen S. Immunocytochemical localization of lysozyme and lactoferrin attached to surface bacteria of the palatine tonsils during infectious mononucleosis. The Journal of laryngology and otology 2002. link 16 Rothwell S, McAuley D. Spontaneous splenic rupture in infectious mononucleosis. Emergency medicine (Fremantle, W.A.) 2001. link 17 Taga K, Taga H, Tosato G. Diagnosis of atypical cases of infectious mononucleosis. Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2001. link 18 Weber R, Hegenbarth V, Kaftan H, Krüpe H, Jaspersen D, Keerl R. Nasopharyngeal endoscopy adds to reliability of clinical diagnosis of infectious mononucleosis. The Journal of laryngology and otology 2001. link 19 Stenfors LE, Bye HM, Räisänen S. Bacterial coating with immunoglobulins on the palatine tonsils during infectious mononucleosis: immunocytochemical study with gold markers. The Journal of laryngology and otology 2001. link 20 Chan SC, Dawes PJ. The management of severe infectious mononucleosis tonsillitis and upper airway obstruction. The Journal of laryngology and otology 2001. link 21 Stenfors LE, Bye HM, Räisänen S, Myklebust R. Bacterial penetration into tonsillar surface epithelium during infectious mononucleosis. The Journal of laryngology and otology 2000. link 22 Lupton JR, Figueroa P, Tamjidi P, Berberian BJ, Sulica VI. An infectious mononucleosis-like syndrome induced by minocycline: a third pattern of adverse drug reaction. Cutis 1999. link 23 Monem SA, O'Connor PF, O'Leary TG. Peritonsillar abscess and infectious mononucleosis: an association or a different presentation of the same condition. Irish medical journal 1999. link 24 Boglioli LR, Taff ML. Sudden asphyxial death complicating infectious mononucleosis. The American journal of forensic medicine and pathology 1998. link 25 Arkkila E, Sipilä J, Laurikainen E, Suonpää J. Peritonsillar abscess associated with infectious mononucleosis. ORL; journal for oto-rhino-laryngology and its related specialties 1998. link 26 Burstin PP, Marshall CL. Infectious mononucleosis and bilateral peritonsillar abscesses resulting in airway obstruction. The Journal of laryngology and otology 1998. link 27 Karajannis MA, Hummel M, Anagnostopoulos I, Stein H. Strict lymphotropism of Epstein-Barr virus during acute infectious mononucleosis in nonimmunocompromised individuals. Blood 1997. link 28 Stenfors LE, Räisänen S. Immunoglobulin-coated bacteria on the tonsillar surface during infectious mononucleosis. The Journal of laryngology and otology 1996. link 29 Ganzel TM, Goldman JL, Padhya TA. Otolaryngologic clinical patterns in pediatric infectious mononucleosis. American journal of otolaryngology 1996. link90073-3) 30 Brook I, de Leyva F. Microbiology of tonsillar surfaces in infectious mononucleosis. Archives of pediatrics & adolescent medicine 1994. link 31 Stenfors LE, Räisänen S. The membranous tonsillitis during infectious mononucleosis is nevertheless of bacterial origin. International journal of pediatric otorhinolaryngology 1993. link90020-4) 32 Stevenson DS, Webster G, Stewart IA. Acute tonsillectomy in the management of infectious mononucleosis. The Journal of laryngology and otology 1992. link 33 Har-El G, Josephson JS. Infectious mononucleosis complicated by lingual tonsillitis. The Journal of laryngology and otology 1990. link 34 Benoliel R, Katz J. Infectious mononucleosis first manifest by pericoronitis: two case reports. Annals of dentistry 1989. link 35 Robinson RG. Abdominal complications of infectious mononucleosis. The Journal of the American Board of Family Practice 1988. link 36 Takimoto T, Tanaka S, Ishikawa S, Umeda R. Infectious mononucleosis in the nasopharynx with a histological picture of malignant lymphoma. Archives of oto-rhino-laryngology 1988. link 37 Sheehan T, McClymont L, O'Donnell JR. Infectious mononucleosis presenting as thrombocytopenic haemorrhage. Scottish medical journal 1986. link 38 Honigman B. Selected serology: pregnancy testing, hepatitis A and B, and infectious mononucleosis. Emergency medicine clinics of North America 1986. link 39 Dommerby H, Stangerup SE, Stangerup M, Hancke S. Hepatosplenomegaly in infectious mononucleosis, assessed by ultrasonic scanning. The Journal of laryngology and otology 1986. link 40 Catling SJ, Asbury AJ, Latif M. Airway obstruction in infectious mononucleosis. A case report. Anaesthesia 1984. link 41 Johnsen T, Katholm M, Stangerup SE. Otolaryngological complications in infectious mononucleosis. The Journal of laryngology and otology 1984. link 42 Johnsen T. Infectious mononucleosis and peritonsillar abscess. The Journal of laryngology and otology 1981. link 43 Wright GD, Lee KD. An isolated right hypoglossal nerve palsy in association with infectious mononucleosis. Postgraduate medical journal 1980. link 44 Ho-Yen DO, Pennington CR. Pseudohyperkalaemia and infectious mononucleosis. Postgraduate medical journal 1980. link 45 Resková D, Kubiková A, Macku M. T and B lymphocytes in peripheral blood of children with infectious mononucleosis and tonsillitis. Acta paediatrica Academiae Scientiarum Hungaricae 1980. link 46 Hedström SA. Treatment of anginose infectious mononucleosis with metronidazole. A controlled clinical and laboratory study. Scandinavian journal of infectious diseases 1980. link 47 Neuberger J, Bone I. Bilateral sixth cranial nerve palsy in infectious mononucleosis. Postgraduate medical journal 1979. link 48 Morgan DG, Niederman JC, Miller G, Smith HW, Dowaliby JM. Site of Epstein-Barr virus replication in the oropharynx. Lancet (London, England) 1979. link92384-5) 49 Rubin RL. Adolescent infectious mononucleosis with psychosis. The Journal of clinical psychiatry 1978. link 50 Kantor RJ, Norden CW, Wein TP. Infectious mononucleosis associated with rhabdomyolysis and renal failure. Southern medical journal 1978. link 51 Evans AS. Infectious mononucleosis and related syndromes. 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Infectious mononucleosis