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conjunctivitis is caused by :: Article Creator What Is Conjunctivitis (Pink Eye)? Symptoms, Diagnosis And Treatment There are four main types of conjunctivitis: viral, allergic, bacterial and chemical. However, there are other, less common types such as immune-mediated and contact lens-related conjunctivitis. Viral Conjunctivitis Viral conjunctivitis is the most common form of pink eye, accounting for around 80% of cases . It's caused by a virus, such as the common cold. It may affect both eyes and can be spread through contact with an infected person's discharge, coughing or sneezing. "Any virus that causes a cold or respiratory flu can also land in the eye and cause pink eye," explains Arthur Lavin, M.D., FAAP, a pediatrician at Akron Children's Hospital in Beachwood, Ohio. According to Dr. Lavin, some of the most common viruses causing viral conjunctivitis include: Adenovirus (a virus that typically causes colds)