1.   A skilled endoscopist is essential, but the equipment can be as simple as a standard endoscope and an injection needle.

2.   In their search to pinpoint a cause, investigators have ruled out contamination of the citric acid that addicts use to dissolve heroin and the injection needles.

3.   No disposables, so injection needles must be boiled repeatedly.

4.   Production was further delayed because the single-shot vials require more liquid to ensure that a full dose is drawn up into the injection needle.

5.   Where there are no facilities Bailey and her team set up dipping tubs and tables covered with injection needles and medicine bottles on patches of gravel outside.

6.   Where there are no facilities, Bailey and her team set up dipping tubs and tables covered with injection needles and medicine bottles on patches of gravel outside.