In a fourth case from 2019, FDA inspectors found that a factory in Florida making children's cough syrup for CVS was using water contaminated with a bacteria that can be deadly to youngsters with weakened immune systems.

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It comes after the US was rocked by a recall of more than 26 store-brand eye drops sold across pharmacies in the country, also including Rite Aid and Walmart.

The drops were contaminated with a bacteria linked to blindness and lethal infections that experts said was able to 'melt through' eyes.

At least four people died from sepsis after using the eyedrops, while 14 lost their vision and more than 80 infections were reported.