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(A to C) Gram staining of cornea tissue infected with pathogens requiring rapid medical intervention. (A) Neisseria gonorrhoeae; (B) Bacillus cereus (note the iris melanin granules [reprinted from reference 394]); (C) hyaline septate mold (scopulariopsis). (D) Papanicolaou stain of HSV infection in the cornea.
