Do you want to know whether the medicine is working for the TB patient? Scientists at the University of St Andrews have developed an innovative test to measure tuberculosis bacteria and how they change in response to medication in 4h. The test compromises three steps: 1) isolation of Mycobaterium tuberculosis RNA from the patient sample, 2) Reverse transcriptase quantitatve polymerase chain reaction (RT-qPCR) and 3) translation of the RT-qPCR output to bacterial load measured as colony forming u