Sensitivity of Pollutant-In-Product Testing

Sensitivity of Pollutant-In-Product Testing

Get some slides of Salmonellas and Shigellas and find some
milk that tests positive to at least one. Make a dilution series of
the milk up to bottle #14, being careful not to shake the bottles.
Start with 2 drops of milk in bottle #1. Use an eye dropper to

deliver 2 drops to subsequent bottles. Begin testing at bottle #14,
using the slide that tested positive. You will learn to search by
frequency later. My sensitivity was routinely around bottle #12,
for a variety of pathogens. It was the same for toxic elements
starting with standard solutions, about 1000 mg/ml, showing this
method is less sensitive than skin testing.