Is conjunctivitis contagious?

Written by Peng Xi Feng
Ophthalmology
Updated on January 16, 2025
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Hyperacute bacterial conjunctivitis has a short incubation period and progresses rapidly. It can be transmitted through genital-eye contact. Acute or subacute bacterial conjunctivitis, commonly known as pink eye, is highly contagious, prevalent in the spring and autumn, and is generally spread through contact with items used by an infected person. Therefore, it is essential to take preventive measures.

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Written by Peng Xi Feng
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How many days can conjunctivitis heal?

Conjunctivitis can be categorized by the speed of onset into hyperacute, subacute, acute, and chronic types. It can also be classified by severity into mild, moderate, and severe. Acute conjunctivitis usually is self-limiting, with the condition lasting about two weeks. Effective localized treatment and administration of sensitive antibiotics can lead to recovery within a few days. In contrast, chronic conjunctivitis is not self-limiting and is more challenging to treat.

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Conjunctivitis symptoms

Conjunctivitis is an inflammation that occurs in the thin layer of structure on the surface of the white eyeball and the inner surface of the eyelid. Conjunctivitis can be caused by infections such as bacteria, viruses, chlamydia, fungi, parasites, etc., and by environmental factors like sand, smoke, ultraviolet exposure, and chemical injuries from acids, alkalis, or toxic gases. It can also be an inflammatory response of the conjunctiva due to allergic or systemic diseases including tuberculosis, syphilis, thyroid disorders, or surrounding tissues of the eye such as the cornea, sclera, eyelids, nasal cavity, and sinuses. Common symptoms of conjunctivitis include red eyes, a sensation of a foreign body in the eye, burning, itching, photophobia (sensitivity to light), tearing, and increased discharge. Sometimes it can also cause eye pain.

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How is conjunctivitis transmitted?

Conjunctivitis is one of the most common eye diseases. The causes of conjunctivitis can be divided into microbial and non-microbial categories, and based on different sources, it can be classified as exogenous or endogenous. It can also be caused by the spread of inflammation from adjacent tissues, with microbial infection being the most common. Transmission primarily occurs through contact, hence it is necessary to strictly disinfect washbasins, towels, and other items that the patient has used.

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Ophthalmology
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Can conjunctivitis be contagious?

Hyperacute bacterial conjunctivitis, acute or subacute bacterial conjunctivitis is highly contagious and requires isolation to prevent spread and epidemics. When one eye is infected, measures should be taken to prevent infection of the other eye. Strict attention should be paid to personal and communal hygiene, advocating frequent hand and face washing, and avoiding wiping eyes with hands or sleeves. Strict disinfection of face washing utensils, towels, and medical instruments used by the patient is also necessary.

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Does conjunctivitis require an IV drip?

Conjunctivitis generally does not require intravenous treatment; it is mainly treated according to the cause, with local administration of medication being the primary approach. Systemic medication may be required when necessary. Eye drops are the most basic method of administering medication for conjunctivitis. Eye ointment can also be applied to the eyes; since it remains in the conjunctival sac for a longer duration, it is advisable to use it before bedtime. When there is a lot of secretion in the conjunctival sac, a non-irritating rinse solution can be used to wash the conjunctival sac. In severe cases of conjunctivitis, such as gonococcal conjunctivitis and chlamydial conjunctivitis, systemic antibiotics or sulfa drugs are needed in addition to local treatment.