antibiotic bottles, the overall incidence of contamination was 19 percent. The difference between the two groups was statistically significant. A total of seven different types of organisms were identified from the eye drop bottles, including Staphylococcus aureus, a type of bacteria that is increasingly becoming resistant to standard antibiotics. Some of the contaminated bottles grew more than one type of contaminant. "The prescription of these drops to patients with compromised ocular surface defences needs to be considered with caution," the team concludes.