Conjunctivitis - Causes
Conjunctivitis can be caused by a bacterial or viral infection; by certain environmental factors, such as smoke, dust, or pollen; or by other factors. Viruses cause many kinds of infections, such as the common cold (see common cold entry), acute respiratory infections, or diseases such as measles (see measles entry). These infections can spread easily to the eye. If they infect the conjunctiva, conjunctivitis results.
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