>> “ Most illnesses caused by E. coli infections are the result of eating undercooked, contaminated ground beef.” <<
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That statement is nonsense!
Most e-coli infections are from fecally tainted produce, particularly spinach or leafy lettuce. People eat hundreds of tons of rare hamburger every day, and problems are very rare.
E-coli bacteria are essential to life, you cannot live without them. Lack of e-coli is the most common cause of the intestinal distress from using antibiotics. E-coli is a part of your immune system.
If you had bothered to read the full text from which the quotation was taken rom and linked, you would have seen the source of the quotation said the same thing. So, your complaint is errant nonsense because you jumped to an entirely wrong conclusion for a lack of reading.