what is the cause of conjunctivitis
Conjunctivitis when caused by an infection is most commonly caused by a viral infection. Bacterial infections, allergies, other irritants and dryness are also common causes. Both bacterial and viral infections are contagious and passed from person to person, but can also spread through contaminated objects or water.onjunctivitis, also known as pink eye is inflammation of the conjunctiva (the outermost layer of the eye and the inner surface of the eyelids).
Conjunctivitis is often called pink eye or red eye because it can cause the white of the eye to take on a pink or red color. The most common causes of conjunctivitis are viruses, bacteria, and allergens.iral conjunctivitis. 1  Can be caused by a number of different viruses, many of which may be associated with an upper respiratory tract infection, cold, or sore throat. 2  Usually begins in one eye and may progress to the second eye within days. 3  Spreads easily and rapidly between people and can result in epidemics.