Which of the following species was once considered so benign that microbiologists used it to trace movements of air currents in hospitals and over cities?

Question

Quizplus · Accepted Answer

Serratia was once used as a tracer organism to study air currents in hospitals and cities because it was considered to be harmless. However, it is now known that some strains of Serratia can cause infections, particularly in hospital settings.

Which of the Following Species Was Once Considered So Benign