acute - Streptococcus pneumoniae; Haemophilus aegyptius (in tropical climates only); Neisseria gonorrhoeae and N. meningitidis; Haemophilus influenzae
chronic - Staphylococcus aureus, often as a complication of dacrocystitis or obstruction of the nasolacrimal duct
infection among children is caused by Streptococcus pneumoniae, Haemophilus influenzae, and Staphylococcus species
most adult cases of acute bacterial conjunctivitis are caused by gram-positive organisms. Staphylococcus species, including Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus species, and Gram-negative organisms such as Escherichia coli, and Pseudomonas species
Neisseria infection should be suspected when severe, bilateral, purulent conjunctivitis is present in a sexually active adult or in a neonate three to five days postpartum
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