The CDC hasn’t been able to pinpoint the exact cause of the outbreak so far. However, there are a few conclusions that are safe to make based on the nature of the bacteria and analysis of product defects.
We know that the Pseudomonas aeruginosa thrives in humid environments like soil and water. We also know that the EzriCare eyedrops didn’t use the necessary preservatives for safe shipping.
When these products get shipped worldwide, they’re exposed to a variety of environments before they reach your doorstep. It’s likely that the product batches got spoiled during this phase, leading to the bacteria outbreak.