Virus 'nanobots' can make harmful bacteria in food and drink glow

Gene-edited bacteriophages, or viruses that attack bacteria, can make potentially dangerous microbes in food and water glow so they are easier to detect. In the United States and the United Kingdom, drinking water must contain no Escherichia coli bacteria, which can cause food-poisoning. But methods for testing water for such potentially dangerous bacteria are either time-consuming or do not reliably detect low microbial concentrations.