**7. Bacteria and bacteria**

Several reports in the literature have described this coinfection. Fröhlich *et. al*. studied patients with and without clinical history of contact lens use and showed that 51 of the 275 samples (18.5 %) from patients with bacteria keratitis were coinfections. The most common pathogens isolated were *Staphylococcus epidermidis* (44 %), *Staphylococcus aureus* (18 %), *Streptococcus* spp. (10 %), *Propionibacterium acnes* (7 %), and *Pseudomonas aeruginosa* (6 %) [20]. Yeh *et. al*. presented a study of 307 samples, of which 21 % were keratitis bacteria-bacteria coinfections with similar bacterial genera [21]. Jones reported coinfections between *Streptococcus pneumoniae* with *Corynebacterium* spp. or *Staphylococcus epidermidis* and isolated three microorganisms from one case, *Staphylococcus aureus* and *Streptococcus pneumoniae*, *Corynebacterium* spp., and *Micrococ‐ cus* spp., and, finally, *Streptococcus equinus* and *Haemophilus influenzae* from another patient.

## **8. Bacteria and yeast**

Coinfections that involve *Candida* spp. or a filamentous fungus are usually difficult to treat, and the prognosis is poor. A coinfection of *Stenotrophomonas maltophilia* (Gram (-) bacteria) and a yeast has been documented. The corneal injury presented as an ulcer that quickly progressed despite treatment with proven sensitivity. The case was treated with penetrat‐ ing keratoplasty [22].
