Ophthalmology – Neonatal Conjunctivitis

Basics

Description

Neonatal conjunctivitis (ophthalmia neonatorum) is conjunctival inflammation occurring during the first 4 weeks of life.

It may be:

• Infectious
• Chemical/toxic
• Iatrogenic

Because some causes—particularly gonococcal and herpes simplex infection—can rapidly threaten the cornea, vision, or life, neonatal conjunctivitis requires prompt etiologic assessment.

Major Causes

Important infectious causes include:

• Neisseria gonorrhoeae
• Chlamydia trachomatis
• Herpes simplex virus (HSV)
• Staphylococcus aureus, including MRSA
• Streptococcus pneumoniae
• Gram-negative enteric organisms
• Other bacterial pathogens

Noninfectious causes include:

• Chemical conjunctivitis
• Toxic reaction to topical medications

Epidemiology

The incidence varies markedly according to:

• Maternal infection prevalence
• Quality of prenatal care
• STI screening programs
• Availability of neonatal prophylaxis

Gonococcal ophthalmia has become uncommon in countries with effective maternal screening and neonatal prophylaxis but remains a major preventable cause of severe ocular morbidity in some settings.

Risk Factors

Important risk factors include:

• Maternal sexually transmitted infection
• Inadequate prenatal care
• Premature rupture of membranes
• Prolonged rupture of membranes
• Low birth weight
• Prematurity
• Failure to receive indicated ocular prophylaxis
• Contaminated ophthalmic instruments
• Respiratory support devices
• Poor infection-control practices

Irritating topical substances or inappropriate traditional remedies may also cause conjunctival inflammation or secondary infection.

Genetics

There is no recognized genetic contribution to ordinary neonatal conjunctivitis.

Prevention

The most important preventive measure is appropriate prenatal screening and treatment of maternal infection, especially:

• Gonorrhea
• Chlamydia
• Syphilis
• HIV
• Genital herpes when clinically relevant

Strict hygiene and sterile technique should be used in neonatal care.

Ocular Prophylaxis

Where recommended by local public-health policy, neonatal ocular prophylaxis is directed primarily against gonococcal ophthalmia.

In the United States, the CDC recommends a single application of erythromycin 0.5% ophthalmic ointment to both eyes at birth. This prophylaxis does not reliably prevent chlamydial conjunctivitis, so prenatal maternal screening remains essential. 

Pathophysiology

Neonatal conjunctivitis usually results from inoculation of the conjunctiva through:

• Passage through an infected birth canal
• Ascending infection after ruptured membranes
• Postnatal contact
• Contaminated equipment or caregivers

Neonates have relatively immature immune defenses, which can allow rapid progression of infection.

Timing of Presentation

The timing of onset can provide an important diagnostic clue.

Chemical Conjunctivitis

Usually:

• Within the first 24 hours

Gonococcal Conjunctivitis

Usually:

• Approximately 2–5 days after birth

Chlamydial Conjunctivitis

Usually:

• Approximately 5–14 days after birth

Herpes Simplex Conjunctivitis

Often develops:

• During the first 1–2 weeks of life

There is overlap, so timing alone must not determine treatment.

Gonococcal Ophthalmia Neonatorum

Neisseria gonorrhoeae is the most immediately vision-threatening bacterial cause.

Typical findings include:

• Rapid onset
• Marked eyelid edema
• Severe conjunctival injection
• Chemosis
• Copious hyperpurulent discharge

The organism can penetrate intact corneal epithelium.

Gonococcal Corneal Disease

Serious complications include:

• Keratitis
• Corneal ulceration
• Corneal melting
• Corneal perforation
• Endophthalmitis
• Permanent blindness

Therefore, suspected gonococcal conjunctivitis is an ophthalmic and pediatric emergency.

Chlamydial Conjunctivitis

Chlamydia trachomatis is another major cause of neonatal conjunctivitis.

Typical manifestations include:

• Mucopurulent discharge
• Eyelid edema
• Conjunctival hyperemia
• Chemosis

Because newborns lack mature conjunctival lymphoid tissue, the classic follicular response seen in adults may be absent.

Chlamydial Systemic Association

Neonatal chlamydial conjunctivitis may be associated with:

• Nasopharyngeal infection
• Genital infection
• Rectal colonization
• Chlamydial pneumonitis

Therefore, topical therapy alone is inadequate.

Herpes Simplex Virus

Neonatal HSV infection may involve:

• Conjunctiva
• Cornea
• Skin
• Mouth
• Central nervous system
• Multiple visceral organs

Ocular HSV should always raise concern for systemic neonatal herpes.

HSV Ocular Findings

Possible findings include:

• Watery or mucoid discharge
• Conjunctivitis
• Vesicular eyelid or skin lesions
• Dendritic epithelial keratitis
• Geographic epithelial ulcer
• Stromal keratitis

Absence of skin vesicles does not exclude neonatal herpes.

Chemical Conjunctivitis

Chemical conjunctivitis may follow exposure to irritating prophylactic or topical agents.

Typical features include:

• Conjunctival injection
• Chemosis
• Mucous discharge

It is generally:

• Early in onset
• Bilateral
• Self-limited

History

Maternal and Birth History

Ask about:

• Quality of prenatal care
• Maternal gonorrhea or chlamydia
• Genital herpes
• Other sexually transmitted infections
• Maternal genital discharge
• Partner STI history
• Premature rupture of membranes
• Duration of membrane rupture
• Mode of delivery
• Perinatal antibiotic treatment

Infant History

Ask about:

• Age at symptom onset
• Low birth weight
• Prematurity
• Fever
• Poor feeding
• Lethargy
• Respiratory symptoms
• Skin vesicles
• Ocular prophylaxis received
• Intensive-care procedures
• Respiratory support
• Previous eye examination or instrumentation

Physical Examination

A complete systemic and ophthalmic examination is required.

Assess:

• General appearance
• Temperature
• Feeding
• Respiratory status
• Skin
• Oral cavity
• Neurologic status

Eyelid Findings

Look for:

• Edema
• Erythema
• Vesicles
• Skin erosions
• Preseptal cellulitis

Marked tense lid edema with copious purulent discharge raises particular concern for gonococcus.

Conjunctiva

Assess for:

• Injection
• Chemosis
• Membranes or pseudomembranes
• Character of discharge

Important Pearl

Discharge without significant conjunctival injection should raise suspicion for congenital nasolacrimal duct obstruction rather than primary conjunctivitis.

Character of Discharge

Gonococcal

Typically:

Profuse, thick, hyperpurulent discharge

Chlamydial

Typically:

• Mucopurulent discharge

HSV

May produce:

• Watery
• Serous
• Mucoid discharge

The discharge pattern alone is not sufficiently reliable to establish the diagnosis.

Corneal Examination

The cornea must be examined carefully in every neonate with significant conjunctivitis.

Look for:

• Epithelial defect
• Infiltrate
• Ulcer
• Corneal thinning
• Perforation

Gonococcal Cornea

Possible findings include:

• Peripheral or central ulcer
• Rapid stromal thinning
• Perforation

Urgent corneal specialist involvement may be required.

HSV Cornea

Possible findings include:

• Dendritic epithelial lesion
• Geographic epithelial defect
• Stromal infiltrate

Topical corticosteroids should not be started empirically in suspected epithelial HSV disease.

Diagnostic Testing

Significant neonatal conjunctivitis should undergo microbiologic investigation rather than being treated empirically with topical drops alone.

Gram Stain

An urgent conjunctival Gram stain is particularly useful when gonorrhea is suspected.

Classic finding:

Intracellular gram-negative diplococci

A suspicious clinical presentation warrants immediate systemic treatment without waiting for final culture results.

Bacterial Culture

Conjunctival specimens should be obtained for:

• Gram stain
• Culture
• Antimicrobial susceptibility testing

Appropriate media must be used when gonococcus is suspected.

Chlamydial Testing

Conjunctival samples should contain epithelial cells, not simply surface discharge.

Testing may include:

• Culture
• Direct fluorescent antibody testing
• Validated nucleic-acid amplification testing depending on local laboratory capability

A neonate evaluated for chlamydial ophthalmia should also be evaluated for gonorrhea. 

HSV Testing

When HSV is suspected, testing may include:

• HSV PCR from ocular or mucosal specimens
• Surface cultures/PCR
• Blood PCR
• CSF evaluation when indicated

Evaluation should be coordinated urgently with pediatrics or pediatric infectious disease.

Additional STI Evaluation

When neonatal gonorrhea or chlamydia is identified, maternal infection and other perinatal infections must be considered.

Depending on the clinical situation, evaluation may include:

• Syphilis
• HIV
• Other sexually transmitted infections

The mother and her sexual partner(s) require evaluation and treatment.

Lumbar Puncture

Lumbar puncture should be considered when:

• HSV infection is suspected
• Meningitis is suspected
• The infant is systemically unwell
• Disseminated infection is possible

Neuroimaging

Brain MRI or other imaging may be indicated when there is concern for:

• HSV encephalitis
• Neurologic abnormalities
• Intracranial complications

Orbital imaging may be required if:

• Orbital cellulitis is suspected
• There is proptosis
• Ocular motility is impaired
• Significant periocular swelling is present

Differential Diagnosis

Important differential diagnoses include:

• Congenital nasolacrimal duct obstruction
• Dacryocystitis
• Neonatal blepharitis
• Blepharoconjunctivitis
• Congenital glaucoma
• Keratitis
• Corneal foreign body or trauma
• Uveitis secondary to congenital infection
• Rare infiltrative ocular disorders

Important Differential – Nasolacrimal Duct Obstruction

NLDO usually causes:

• Epiphora
• Mucous discharge
• Matted lashes

but typically:

Little or no conjunctival injection

Important Differential – Congenital Glaucoma

Congenital glaucoma typically presents with:

• Epiphora
• Photophobia
• Blepharospasm
• Corneal enlargement
• Corneal haze

This requires urgent ophthalmologic assessment.

Treatment

Treatment depends on the organism.

Because neonatal infection can progress rapidly, significant conjunctivitis should be managed jointly with:

• Ophthalmology
• Pediatrics
• Pediatric infectious disease when appropriate

Gonococcal Conjunctivitis

Emergency Treatment

Current CDC therapy for uncomplicated gonococcal ophthalmia neonatorum is:

Ceftriaxone 25–50 mg/kg IV or IM once, maximum 250 mg.

Cefotaxime can be used in neonates in whom ceftriaxone is unsuitable, such as certain situations involving hyperbilirubinemia or IV calcium exposure. Systemic treatment—not topical therapy alone—is essential. 

The infant should also be assessed for disseminated gonococcal infection, including:

• Sepsis
• Arthritis
• Meningitis

Ocular Irrigation in Gonococcal Disease

Frequent sterile saline irrigation may be useful to remove large amounts of purulent material.

This is adjunctive and never substitutes for systemic antibiotics.

Chlamydial Conjunctivitis

Systemic therapy is mandatory because infection can also involve the respiratory and nasopharyngeal tracts.

The CDC recommended regimen is:

Erythromycin base or ethylsuccinate 50 mg/kg/day orally in 4 divided doses for 14 days. 

A short-course azithromycin regimen may be used in selected circumstances, although evidence in neonates is more limited. 

Chlamydia – Important Medication Warning

Oral erythromycin and azithromycin in infants younger than approximately 6 weeks have been associated with:

Infantile hypertrophic pyloric stenosis

Parents should be advised to monitor for:

• Forceful vomiting
• Feeding intolerance
• Progressive vomiting

despite the need to treat the infection appropriately. 

Topical Therapy in Chlamydia

Topical antibiotics alone are inadequate because chlamydia is not limited to the conjunctiva.

When appropriate systemic therapy is given, routine topical treatment is generally unnecessary. 

Herpes Simplex Virus

Neonatal HSV requires urgent systemic acyclovir.

Standard systemic therapy is:

Acyclovir 20 mg/kg IV every 8 hours

with duration depending on disease extent:

• Approximately 14 days for disease limited to skin, eyes, and mouth
• 21 days for CNS or disseminated disease 

Ocular HSV should also be managed with a pediatric ophthalmologist, with topical antiviral treatment when indicated.

HSV and Steroids

Topical corticosteroids should not be used empirically in neonatal epithelial HSV keratitis.

Any steroid treatment for HSV-associated stromal disease requires specialist supervision and concurrent antiviral coverage.

Other Bacterial Conjunctivitis

Treatment should be guided by:

• Gram stain
• Culture
• Sensitivities
• Clinical severity

Coverage should reflect local resistance patterns, including MRSA where appropriate.

Systemically ill neonates require systemic evaluation and treatment.

Chemical Conjunctivitis

Management consists primarily of:

• Discontinuing the offending agent
• Gentle ocular cleansing or irrigation
• Supportive care

Most cases are self-limited.

Persistent or worsening inflammation should prompt reconsideration of an infectious cause.

Corneal Involvement

Urgent corneal or pediatric ophthalmology consultation is required for:

• Corneal ulcer
• Stromal infiltrate
• Progressive thinning
• Impending perforation
• Actual perforation
• Persistent HSV keratitis

Hospital Admission

Admission should be strongly considered for neonates with:

• Suspected gonococcal disease
• Suspected neonatal HSV
• Severe purulent conjunctivitis
• Corneal involvement
• Dacryocystitis with systemic illness
• Preseptal or orbital cellulitis
• Fever or sepsis
• Poor feeding
• Neurologic symptoms

A systemically ill neonate should be managed as a medical emergency.

Infection-Control Precautions

Appropriate contact and infection-control precautions should be used according to the suspected organism and hospital protocol.

Maternal and Partner Management

If gonorrhea or chlamydia is identified:

• The mother requires evaluation and treatment.
• Sexual partner(s) require evaluation and treatment.
• Other STIs should be considered.

This reduces maternal complications and future transmission.

Follow-Up

Close follow-up is required until:

• Discharge resolves
• Conjunctival inflammation clears
• Corneal integrity is confirmed
• Systemic infection has been excluded or treated

Chlamydial disease requires follow-up because treatment failure can occur.

Long-Term Ophthalmic Follow-Up

If corneal scarring develops, the infant should be monitored for:

• Refractive error
• Irregular astigmatism
• Anisometropia
• Deprivation amblyopia

Early amblyopia management may be essential.

Patient Education

Parents should understand that neonatal conjunctivitis can occasionally represent a serious systemic infection.

Urgent reassessment is needed for:

• Increased eyelid swelling
• Copious purulent discharge
• Corneal clouding
• Poor feeding
• Fever
• Lethargy
• Skin vesicles
• Seizures
• Respiratory symptoms

Unsterile traditional remedies, including substances such as urine, should not be placed into the infant’s eyes.

Prognosis

Uncomplicated Disease

Prognosis is generally:

Excellent

when the cause is identified and treated promptly.

Corneal Scarring

Visual prognosis becomes variable because of:

• Optical distortion
• Anisometropia
• Amblyopia

Gonococcal Corneal Perforation

Prognosis can be poor because of:

• Dense corneal scarring
• Endophthalmitis
• Structural ocular damage
• Severe amblyopia

Complications

Important complications include:

• Corneal ulceration
• Corneal perforation
• Corneal scarring
• Keratitis
• Endophthalmitis
• Amblyopia
• Preseptal cellulitis
• Orbital cellulitis
• Sepsis
• Chlamydial pneumonitis
• HSV encephalitis
• Disseminated neonatal HSV

Ophthalmology Pearls

• Neonatal conjunctivitis = conjunctivitis during the first 4 weeks of life.
• Timing is helpful: chemical first day, gonococcus approximately 2–5 days, chlamydia approximately 5–14 days, HSV commonly during the first 1–2 weeks.
• Copious hyperpurulent discharge = gonococcus until proven otherwise.
• Gonococcus can invade an intact cornea and rapidly cause ulceration and perforation.
• Chlamydial conjunctivitis requires systemic therapy because of associated nasopharyngeal and pulmonary infection.
• Neonatal HSV requires systemic IV acyclovir, even when ocular disease appears localized.
• Dendritic keratitis in a neonate should immediately raise concern for HSV.
• Discharge with little or no conjunctival injection favors nasolacrimal duct obstruction.
• Epiphora with photophobia, blepharospasm, and corneal haze suggests congenital glaucoma rather than simple conjunctivitis.
• Any systemically unwell neonate with conjunctivitis requires urgent pediatric evaluation.