Approximately what percent of cattle feed is contaminated with E. coli O157?

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Multiple Choice

Approximately what percent of cattle feed is contaminated with E. coli O157?

Explanation:
Contamination in cattle feed by E. coli O157 is very uncommon, typically around one-half of one percent. This means that only a small fraction of feed samples would test positive, which aligns with surveillance data and risk assessments that place feed contamination at a low level despite the organism being a concern in cattle and beef processing. The other options would imply either a much higher prevalence (5% or 50%), which isn’t supported by evidence, or an even smaller rate (0.05%), which underestimates typical findings. So the best estimate is about 0.5%.

Contamination in cattle feed by E. coli O157 is very uncommon, typically around one-half of one percent. This means that only a small fraction of feed samples would test positive, which aligns with surveillance data and risk assessments that place feed contamination at a low level despite the organism being a concern in cattle and beef processing. The other options would imply either a much higher prevalence (5% or 50%), which isn’t supported by evidence, or an even smaller rate (0.05%), which underestimates typical findings. So the best estimate is about 0.5%.

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