Considering the popular use of antibiotic-containing eyedrops in Korea, it is important to know the emerging antibiotic-resistant strains of bacteria before treating infectious eye diseases. This is especially important in high-risk groups because of the high incidence of resistant infections and the subsequent treatment requirements. We report two cases of methicillin-resistant Staphylococcus aureus (MRSA) corneal ulcers in high-risk groups. The first case involved a patient who had keratitis after using antibiotic- and steroid-containing eyedrops to treat a corneal opacity that developed after repeated penetrating keratoplasty. The second case involved a patient who used antibiotic-containing eyedrops and a topical lubricant on a regular basis for >1 month to treat exposure keratitis due to lagophthalmos. The second patient's problems, which included a persistent superficial infiltration, developed after brain tumor surgery. Both cases showed MRSA on corneal culture, and the corneal ulcers improved in both patients after the application of vancomycin-containing eyedrops. In conclusion, MRSA infection should be considered in corneal ulcers that have a round shape, mild superficial infiltration, and slow progression, especially in high-risk groups. This report includes descriptions of the characteristic features, antibiotic sensitivities, prevention, and successful treatment with vancomycin-containing eyedrops for MRSA corneal ulcers.
Cornea/*microbiology/pathology ; Corneal Ulcer/diagnosis/*microbiology ; Diagnosis, Differential ; Eye Infections, Bacterial/diagnosis/*microbiology ; Female ; Follow-Up Studies ; Humans ; Male ; Methicillin-Resistant Staphylococcus aureus/*isolation & purification ; Middle Aged ; Staphylococcal Infections/diagnosis/*microbiology

Although there have been a few reported cases of Enterococcal endophthalmitis, this is an unusual case of endophthalmitis complicated with corneal ulcer caused by Enterococcus faecalis. A 67-year-old male patient with diabetes mellitus underwent secondary intraocular lens implantation. Post-operative recovery was uneventful until a wound rupture was noted 3 weeks after the operation. On day 12 after the repair of the wound, endophthalmitis accompanied by wound necrosis and a fullthickness corneal ulcer was detected. His vision was light perception, and Enterococcus faecalis was identified by culture in samples of conjunctival sac, anterior chamber and vitreous humor. After 3 rounds of intravitreal antibiotics injection, the vitreous opacity disappeared on ultrasonographic finding but corneal opacity and corneal neovascularization still remained.
Aged ; Anti-Bacterial Agents/administration & dosage ; Corneal Ulcer/diagnosis/drug therapy/*microbiology ; Endophthalmitis/diagnosis/drug therapy/*microbiology ; Enterococcus faecalis/drug effects/*isolation & purification ; *Eye Infections, Bacterial/diagnosis/drug therapy/microbiology ; Gram-Positive Bacterial Infections/diagnosis/drug therapy/*microbiology ; Humans ; Lens Implantation, Intraocular ; Male ; Microbial Sensitivity Tests ; Surgical Wound Infection/diagnosis/drug therapy/*microbiology ; Treatment Outcome

PURPOSE: To report 2 cases of Comamonas acidovorans keratitis in immunocompromised cornea. METHODS: A complete review of the medical records of the two cases of Comamonas acidovorans keratitis. RESULTS: We found some similarities in clinical courses of two cases. Both of them showed development of keratitis during the management with corticosteroids, delayed onset, slow response to antibiotics, and relatively less affected corneal epithelium. CONCLUSIONS: Comamonas acidovorans is known as a less virulent organism. However it can cause an indolent infection that responds slowly even to adequate antibiotics therapy in immunocompromised corneas.
Amikacin/therapeutic use ; Anti-Bacterial Agents/therapeutic use ; Ceftazidime/therapeutic use ; Ciprofloxacin/therapeutic use ; Corneal Ulcer/diagnosis/drug therapy/*microbiology ; Delftia acidovorans/*isolation & purification ; Drug Therapy, Combination ; Eye Infections, Bacterial/diagnosis/drug therapy/*microbiology ; Gram-Negative Bacterial Infections/diagnosis/drug therapy/*microbiology ; Humans ; *Immunocompromised Host ; Male ; Microbial Sensitivity Tests ; Middle Aged

PURPOSE: To report 2 cases of Comamonas acidovorans keratitis in immunocompromised cornea. METHODS: A complete review of the medical records of the two cases of Comamonas acidovorans keratitis. RESULTS: We found some similarities in clinical courses of two cases. Both of them showed development of keratitis during the management with corticosteroids, delayed onset, slow response to antibiotics, and relatively less affected corneal epithelium. CONCLUSIONS: Comamonas acidovorans is known as a less virulent organism. However it can cause an indolent infection that responds slowly even to adequate antibiotics therapy in immunocompromised corneas.
Amikacin/therapeutic use ; Anti-Bacterial Agents/therapeutic use ; Ceftazidime/therapeutic use ; Ciprofloxacin/therapeutic use ; Corneal Ulcer/diagnosis/drug therapy/*microbiology ; Delftia acidovorans/*isolation & purification ; Drug Therapy, Combination ; Eye Infections, Bacterial/diagnosis/drug therapy/*microbiology ; Gram-Negative Bacterial Infections/diagnosis/drug therapy/*microbiology ; Humans ; *Immunocompromised Host ; Male ; Microbial Sensitivity Tests ; Middle Aged