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What Is Bacterial Conjunctivitis?

Bacterial conjunctivitis is an eye infection caused by bacteria that inflame the conjunctiva, the thin membrane covering the white part of the eye and inside of the eyelids. It leads to redness, swelling, and a sticky discharge that can make the eyelids stick together, especially in the morning. The condition is highly contagious and spreads easily through contact with infected hands or objects. It affects people of all ages but is common in children.

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What Is Bacterial Conjunctivitis?

Bacterial conjunctivitis is an eye infection caused by bacteria that inflame the conjunctiva, the thin membrane covering the white part of the eye and inside of the eyelids. It leads to redness, swelling, and a sticky discharge that can make the eyelids stick together, especially in the morning. The condition is highly contagious and spreads easily through contact with infected hands or objects. It affects people of all ages but is common in children.

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How Does Bacterial Conjunctivitis Develop?

The infection occurs when bacteria enter the eye through contact with contaminated surfaces or secretions. Common bacteria include Staphylococcus aureus, Streptococcus pneumoniae, and Haemophilus influenzae. Once inside, the bacteria irritate the conjunctiva, leading to inflammation and discharge. Both eyes can become infected, though it often starts in one eye first.

What Causes Bacterial Conjunctivitis?

Poor hand hygiene, sharing towels, or touching the eyes with dirty hands can spread the bacteria. It may also develop after upper respiratory infections or sinus issues. Contact lens wearers are at higher risk if lenses are not cleaned properly. Seasonal outbreaks often happen in schools and daycares due to close contact between individuals.

What Are the Symptoms of Bacterial Conjunctivitis?

Symptoms include red eyes, thick yellow or green discharge, and eyelid swelling. The eyes may feel gritty or irritated, and vision can blur temporarily from the discharge. Crusting around the lashes is common upon waking. Light sensitivity and mild itching can also occur.

How Is Bacterial Conjunctivitis Treated?

  • Antibiotic eye drops or ointments are prescribed to clear the infection.
  • Cleaning away discharge with a clean, damp cloth helps relieve irritation.
  • Avoid touching or rubbing the eyes to prevent spreading the bacteria.
  • Replace pillowcases, towels, and cosmetics to avoid reinfection.

When to Get Checked

If your eyes become red, sticky, or produce yellow or green discharge, see a doctor for proper treatment. Bacterial conjunctivitis can spread easily and often needs medication to clear. Early care helps relieve symptoms and prevents the infection from passing to others. Children and contact lens wearers should be evaluated quickly. Prompt treatment supports faster recovery.

Frequently Asked Questions

How can bacterial conjunctivitis be told apart from allergies?

Bacterial conjunctivitis often causes thick yellow or green discharge that crusts on the lashes, especially after sleep. Allergies more often cause intense itching and watery tears, with discharge that is clear and stringy. Bacterial cases can start in one eye and spread to the other quickly, while allergies often affect both eyes at the same time. An exam helps confirm the cause when symptoms overlap.

How long is bacterial conjunctivitis contagious?

It is contagious while there is active discharge and until treatment starts working. Many people become less contagious after using antibiotic drops for about 24 hours, but guidance can vary by clinician and setting. Good handwashing and avoiding shared towels reduce spread. If symptoms keep worsening, reevaluation is needed.

Should contact lenses be worn during bacterial conjunctivitis?

No, contact lenses should be avoided until the infection clears and the eye is comfortable again. Wearing lenses can trap bacteria and increase irritation or infection risk. Replace the lens case and consider discarding any lenses worn right before symptoms started. An eye doctor can advise when it is safe to restart lens wear.

What cleaning steps help prevent reinfection at home?

Wash hands often, especially before touching the face or applying drops. Use a clean cloth each time you wipe discharge and do not share towels or pillowcases. Replace eye makeup and avoid using old products around the eyes. These steps help prevent the infection from coming back or spreading to others.

References

1. Conjunctivitis (Pink Eye). Centers for Disease Control and Prevention. https://www.cdc.gov/conjunctivitis/. Accessed January 15, 2026.

2. Types of Conjunctivitis (including bacterial). Centers for Disease Control and Prevention. https://www.cdc.gov/conjunctivitis/about/index.html. Accessed January 15, 2026.

3. Pinkeye (Conjunctivitis). MedlinePlus. https://medlineplus.gov/pinkeye.html. Accessed January 15, 2026.

4. Conjunctivitis. American Academy of Ophthalmology. https://www.aao.org/eye-health/diseases/pink-eye-conjunctivitis. Accessed January 15, 2026.

5. Conjunctivitis. National Health Service (NHS). https://www.nhs.uk/conditions/conjunctivitis/. Accessed January 15, 2026.

6. Conjunctivitis (clinical overview). Merck Manual Consumer Version. https://www.merckmanuals.com/home/eye-disorders/conjunctival-and-scleral-disorders/conjunctivitis. Accessed January 15, 2026.