A new study suggests that the bacteria responsible for causing tuberculosis facilitate their own spread by producing a molecule that triggers the cough. The study was published in the journal - Cell. The findings of the study can lead to new ways to prevent the spread of tuberculosis which is responsible for the death of more than 1.5 million people per year worldwide. People have known since ancient times that coughing is a primary symptom of tuberculosis and that cough allows for the spread of disease from person to person. However the cause of tuberculosis-related coughs has been unclear says