Intoxications Aigua S of the most frequent causes of intoxications aigua s is microbial contamination. Harmful microorganisms such as Escherichia coli (E. coli), Giardia, Cryptosporidium, and noroviruses can enter water supplies through sewage leaks, agricultural runoff, or inadequate water treatment. These pathogens ca K Kristina Kunze Dec 9, 2025