Can conjunctivitis be contagious?

Written by Peng Xi Feng
Ophthalmology
Updated on September 08, 2024
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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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Written by Peng Xi Feng
Ophthalmology
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Precautions for Conjunctivitis

For conjunctivitis, strict attention must be paid to personal and public hygiene. Second, patients in the acute phase need to be isolated to avoid contagion and prevent an epidemic. Third, strict disinfection is required for face-washing items, towels, and medical instruments that have been used by the patient. Fourth, medical staff must wash and disinfect their hands after contact with patients to prevent cross-infection. Fifth, newborns should routinely be given antibiotic eye drops immediately after birth.

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Ophthalmology
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Trachoma conjunctivitis symptoms

Trachoma is a chronic infectious conjunctivitis and keratitis caused by Chlamydia trachomatis, which can lead to blindness. During the acute phase in both eyes, symptoms include redness, pain, foreign body sensation, tearing, and purulent discharge, along with swollen lymph nodes, increased papillary formation in the palpebral conjunctiva, and multiple follicles covering the superior and inferior fornices. After the acute phase, which lasts one to two months, it enters a chronic phase where conjunctival congestion decreases, and the conjunctiva thickens with increased papillary and follicular formation. Complications in the later chronic stage mainly include entropion and trichiasis, eyelid ptosis, symblepharon, essential keratoconjunctivitis sicca, and chronic dacryocystitis leading to corneal opacity, among others.

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Ophthalmology
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What are the symptoms of conjunctivitis?

According to the onset speed of conjunctivitis, it can be divided into hyperacute conjunctivitis, acute or subacute conjunctivitis, and chronic conjunctivitis. The symptoms of conjunctivitis mainly include foreign body sensation, burning sensation, itching eyes, photophobia, tearing, and significant signs include conjunctival congestion, edema, increased secretions, papillary hyperplasia, follicles, pseudomembranes and true membranes, granuloma, and so on.

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Ophthalmology
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Conjunctivitis and Keratitis Differences

Under normal circumstances, bacteria can reside in the conjunctival sac. Infection can occur when the pathogenicity of infecting bacteria is stronger than the host's defense capabilities, or when the host's defense capabilities are compromised. Patients with varying degrees of conjunctival hyperemia and purulent, mucoid, or mucopurulent secretions in the conjunctival sac should be suspected of bacterial conjunctivitis. Keratitis refers to the condition where the cornea's defense capabilities are reduced, and inflammation of the corneal tissue occurs due to external or endogenous pathogenic factors invading the cornea.

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Written by Peng Xi Feng
Ophthalmology
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Is conjunctivitis prone to recurrence?

Conjunctivitis is a type of localized inflammation, similar to other inflammations. This disease may recur frequently, especially in children, infants, elderly or frail patients, or those with chronic debilitating diseases such as diabetes. Due to weaker bodily resistance, these individuals are more susceptible to repeated bacterial infections. To avoid such situations, it is advised to pay attention to healthy dietary habits, avoid spicy and irritating foods, and appropriately increase physical exercise to enhance resistance, thereby minimizing the chances of disease recurrence.