Causes of Conjunctivitis
Different types of pink eye have different causes. Bacteria such as Staphylococcus aureus and Streptococcus pneumoniae and several viruses can all cause conjunctivitis. Allergies to pollen, animal dander and other irritants can also cause pink eye. STDs are dangerous to newborns as they can cause conjunctivitis and even blindness as they are being born. Contact lenses and several other irritants can all result in pink eye.