Acute Hemorrhagic Conjunctivitis: Understanding the Red, Itchy Eye

Understanding Acute Hemorrhagic Conjunctivitis (AHC) Acute Hemorrhagic Conjunctivitis (AHC) is a highly contagious viral infection that affects the eyes. It's a severe form of 'pink eye' (conjunctivitis), characterized by inflammation of the conjunctiva, the thin membrane covering the eyeball and inner eyelid. While most cases are temporary, AHC can cause significant discomfort and, in extremely rare instances, more serious complications. This blog post aims to provide a comprehensive understanding of AHC for Indian readers, covering its causes, symptoms, diagnosis, treatment, and prevention, all in clear, practical language. What is Conjunctivitis? Conjunctivitis, commonly known as pink eye, is an inflammation or infection of the conjunctiva. This inflammation can be triggered by various factors, including viruses, bacteria, allergies, or irritants. AHC is a specific type of viral conjunctivitis that is particularly aggressive and can lead to bleeding in the eye. What Causes Acute Hemorrhagic Conjunctivitis? AHC is primarily caused by specific types of viruses. The most common culprits are: Enterovirus 70 (EV-70): This is a major cause of AHC outbreaks worldwide. Coxsackievirus A24 variant (CA24v): This virus is also frequently implicated in AHC cases. Adenoviruses: While adenoviruses can cause common colds and other infections, certain types can also lead to AHC. The transmission of these viruses is highly efficient, making AHC prone to outbreaks, especially in crowded environments. The primary modes of transmission include: Hand-to-eye contact: This is the most common way AHC spreads. Touching contaminated surfaces or objects (like doorknobs, phones, or towels) and then touching your eyes can transfer the virus. Direct contact with infected fluids: Sharing personal items like towels, handkerchiefs, or makeup tools can spread the virus. Airborne particles: Some viruses, like certain adenoviruses, can spread through respiratory droplets in the air, which can then land on the eyes. Fecal-oral route: In some cases, viruses causing AHC can spread if infectious material from feces reaches the eyes, particularly through poor hygiene after using the toilet or changing diapers. Historically, AHC has been noted in specific regions. In parts of West Africa, it was nicknamed “Apollo 11 disease” due to its discovery in Ghana in 1969, the same year as the moon landing. Studies in China have shown that AHC cases tend to spread more easily in educational institutions during specific months, highlighting the role of close contact in its transmission. Who is Most at Risk? AHC is more prevalent in areas with limited access to clean water and sanitation, and where people live in close proximity. This is because viruses can spread more easily through shared water sources or airborne particles in densely populated areas. Individuals who frequently use public facilities like gyms, swimming pools, or public restrooms may also be at a higher risk due to the potential for contact with contaminated surfaces. Symptoms of Acute Hemorrhagic Conjunctivitis The onset of AHC symptoms is typically sudden and can be quite alarming. Common signs and symptoms include: Sudden redness of the eye(s): The eye(s) can become intensely red, often appearing bloodshot. Feeling of a foreign object: A sensation that something is stuck in the eye. Swelling of the eyelids: The eyelids may become puffy and swollen. Watery discharge: The eye may produce a watery discharge. Subconjunctival hemorrhage: This is a hallmark symptom where small blood vessels under the conjunctiva rupture, causing noticeable bleeding and a bright red appearance in parts or all of the white of the eye. This bleeding is usually painless and doesn't affect vision but can look severe. Chemosis: This refers to fluid accumulation under the conjunctiva, causing it to appear swollen, gelatinous, and sometimes blister-like. Blurred vision: Vision may become temporarily blurred, often due to discharge or swelling. Sensitivity to light (photophobia): Some individuals may experience discomfort in bright light. Itching and irritation: The affected eye(s) can feel itchy and irritated. While most symptoms are temporary and resolve within 5 to 7 days, the bleeding and swelling can be quite pronounced, making the eye appear severely affected. Diagnosis of AHC If you suspect you have AHC or any form of conjunctivitis, it is crucial to consult an eye doctor (ophthalmologist or optometrist) promptly. The diagnosis typically involves: Medical History: The doctor will ask about your symptoms, their onset, and any potential exposures. Eye Examination: A thorough examination of the eye using a slit lamp is performed. This specialized microscope allows the doctor to get a magnified view of the conjunctiva, cornea, and other eye structures to assess the extent of inflammation, bleeding, and discharge. Viral Testing (less common): In some cases, especially during outbreaks or if the diagnosis is unclear, a sample of eye discharge might be collected for laboratory testing to identify the specific virus. However, this is not always necessary for diagnosis and treatment. The characteristic symptoms of sudden onset, significant redness, discharge, and subconjunctival hemorrhage are often sufficient for a doctor to diagnose AHC. Treatment for Acute Hemorrhagic Conjunctivitis Currently, there is no specific antiviral cure for AHC. The treatment focuses on managing the symptoms and supporting the body's natural healing process. The virus typically clears on its own within a week to ten days. Recommended treatments include: Artificial Tears: Over-the-counter lubricating eye drops can help soothe irritation and dryness. Cool Compresses: Applying a clean, cool, damp cloth to the closed eyelids can help reduce swelling and provide comfort. Avoiding Eye Rubbing: It is essential to avoid rubbing the eyes, as this can worsen irritation and potentially spread the infection. Hygiene:

In summary, timely diagnosis, evidence-based treatment, and prevention-focused care improve long-term health outcomes.