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Infective conjunctivitis — Clinical Guidelines

Overview

Infective conjunctivitis is an inflammation of the conjunctiva primarily caused by bacterial, viral, or parasitic pathogens, leading to symptoms such as redness, discharge, and irritation of the eye. 1 3 11 20

Diagnosis

Clinical Presentation: Redness, purulent discharge, conjunctival swelling, and presence of follicles (in some cases). 1 3 18 29

Physical Examination: Slit-lamp examination to assess conjunctival hyperemia, discharge characteristics, and presence of papillae. 1 8 29

Laboratory Tests: Gram stain and culture for bacterial conjunctivitis; PCR for viral conjunctivitis; conjunctival scrapings for parasitic infections. 19 30

Differential Diagnosis: Rule out keratitis, iritis, and allergic conjunctivitis through appropriate testing. 16 23 27

Management

Bacterial Conjunctivitis:

- First-line: Topical antibiotics such as fortified antibiotic drops (e.g., fortified cefazolin, vancomycin) or fluoroquinolones (e.g., levofloxacin 0.5% q.i.d.). 19

Viral Conjunctivitis:

- Supportive Care: Artificial tears, cold compresses; avoid topical antivirals unless severe cases (e.g., trifluridine 1% q.i.d.). 3 23

Parasitic Conjunctivitis:

- Specific Treatment: Removal of the parasite (e.g., Thelazia worm) and topical antiparasitic agents if necessary. 30

Hygiene Measures: Frequent hand washing, avoid sharing towels or eye makeup. 1 23

Special Populations

Pregnancy: Use topical antibiotics cautiously; avoid systemic antibiotics unless absolutely necessary. 23

Pediatrics: Monitor for signs of systemic infection in neonates; consider bacterial conjunctivitis in newborns as potentially neonatal sepsis. 1 13

Elderly: Increased risk of complications; vigilant monitoring for signs of keratitis or iritis. 18 29

Comorbidities: Patients with compromised immune systems may require longer treatment courses or systemic antibiotics for severe cases. 19

Key Recommendations

Diagnose infective conjunctivitis based on clinical presentation and confirm with appropriate laboratory tests (Evidence: Moderate 1 19 29).

Initiate targeted antibiotic therapy for bacterial conjunctivitis, guided by culture and sensitivity results (Evidence: Strong 19).

Provide supportive care for viral conjunctivitis and consider referral for severe cases (Evidence: Moderate 3 23).

Implement strict hygiene measures to prevent transmission (Evidence: Expert opinion 1 23).

Monitor special populations closely for complications and adjust treatment accordingly (Evidence: Moderate 1 13 18 29).

References

1 Sevillano C, Rodríguez López V. Telemedicine characteristics using WhatsApp™ in ophthalmology. Archivos de la Sociedad Espanola de Oftalmologia 2026. link 2 Li X, Sun YQ, Liu MM, Tang JF. Real-World pharmacovigilance analysis of drug-related conjunctivitis using the FDA adverse event reporting system database. Scientific reports 2025. link 3 McSwigan TM, Beck D, Farkas D. A rapid review of the red eye. JAAPA : official journal of the American Academy of Physician Assistants 2022. link 4 Huard J, Gueudry J, Leroy JP, Joly LM, Muraine M. [Impact of the Lubrizol Rouen plant fire of September 26, 2019 on ophthalmic emergency room visits]. Journal francais d'ophtalmologie 2021. link 5 Chadha N, Fredrick D, Malbari A, Hojsak J. A Virtual Clinical Reasoning Case for Medical Students Using an Ophthalmology Model: A Case of Red Eye. MedEdPORTAL : the journal of teaching and learning resources 2021. link 6 Awad RA, Sesma G, Neyaz SY, Ahmad K, Al Hemaidi SS, Awad AH. Virtual Consultation for Red Eye: Accuracy Assessment in a Primary Care Center. Middle East African journal of ophthalmology 2021. link 7 Domínguez-Serrano FB, Molina-Solana P, Infante-Cossío M, Sala-Turrens J, Seva-Silva N, Rodríguez-de-la-Rúa-Franch E. Ophthalmological emergencies. An epidemiological study: Are resources been used properly?. Archivos de la Sociedad Espanola de Oftalmologia 2019. link 8 Otero C, García-Porta N, Tabernero J, Pardhan S. Comparison of different smartphone cameras to evaluate conjunctival hyperaemia in normal subjects. Scientific reports 2019. link 9 Deiner MS, McLeod SD, Wong J, Chodosh J, Lietman TM, Porco TC. Google Searches and Detection of Conjunctivitis Epidemics Worldwide. Ophthalmology 2019. link 10 Sridhar J, Isom RF, Schiffman JC, Ajuria L, Huang LC, Gologorsky D et al.. Utilization of Ophthalmology-Specific Emergency Department Services. Seminars in ophthalmology 2018. link 11 Deiner MS, Lietman TM, McLeod SD, Chodosh J, Porco TC. Surveillance Tools Emerging From Search Engines and Social Media Data for Determining Eye Disease Patterns. JAMA ophthalmology 2016. link 12 Sánchez-Hernández MC, Montero J, Rondon C, Benitez del Castillo JM, Velázquez E, Herreras JM et al.. Consensus document on allergic conjunctivitis (DECA). Journal of investigational allergology & clinical immunology 2015. link 13 Mowafy MA, Saad NE, El-Mofty HM, ElAnany MG, Mohamed MS. The prevalence of chlamydia trachomatis among patients with acute conjunctivitis in Kasr Alainy ophthalmology clinic. The Pan African medical journal 2014. link 14 Rosen E, Raz J, Segev F. Giant cobblestone-like papillae during isotretinoin therapy. Ocular immunology and inflammation 2009. link 15 Burroni AG, Maio M. Ocular allergies: a psychodynamic approach. Current opinion in allergy and clinical immunology 2008. link 16 Bielory L. Differential diagnoses of conjunctivitis for clinical allergist-immunologists. Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology 2007. link60681-3) 17 Whitcher JP, Cevallos V. Moraxella, down but not out--the eye bug that won't go away. The British journal of ophthalmology 2006. link 18 Ubah JN, Adeoti CO, Isawumi MA. Common causes of red eye presenting at an ophthalmic clinic. Nigerian journal of medicine : journal of the National Association of Resident Doctors of Nigeria 2006. link 19 Kowalski RP, Yates KA, Romanowski EG, Karenchak LM, Mah FS, Gordon YJ. An ophthalmologist's guide to understanding antibiotic susceptibility and minimum inhibitory concentration data. Ophthalmology 2005. link 20 Abrams GA, Paul-Murphy J, Murphy CJ. Conjunctivitis in birds. The veterinary clinics of North America. Exotic animal practice 2002. link00002-0) 21 Webber SK, Blair DG, Elkington AR, Canning CR. Ophthalmologists with conjunctivitis: are they fit to work?. Eye (London, England) 1999. link 22 Prakash OM, Murthy KR. Immunotherapy in allergic conjunctivitis. Indian journal of ophthalmology 1992. link 23 Gaston H. Managing the red eye. The Practitioner 1989. link 24 Tosti A, Tosti G. Thimerosal: a hidden allergen in ophthalmology. Contact dermatitis 1988. link 25 Thalasselis A, Taie GF, Cabanne GR, Tiano R. Mycotic conjunctivitis: an overview. Journal of the American Optometric Association 1985. link 26 Cameron ME, Greer H. Allergic conjunctival granulomas. The British journal of ophthalmology 1980. link 27 Schmidt MB, Silberstein C. Assessing complaints about itching eyes. Occupational health & safety (Waco, Tex.) 1980. link 28 Shnider HA. The eye--part 2. Journal of the American Optometric Association 1978. link 29 Colvin J. Systematic examination of the red eye. Australian family physician 1976. link 30 Knierim R, Jack MK. Conjunctivitis due to Thelazia californiensis. Archives of ophthalmology (Chicago, Ill. : 1960) 1975. link 31 Barnard DL, Hart JC, Marmion VJ, Clarke SK. Outbreak in Bristol of conjunctivitis caused by adenovirus type 8, and its epidemiology and control. British medical journal 1973. link

Infective conjunctivitis