Most patients come in carrying contagious diseases. The nursing staff is most exposed to all the horrible diseases because they deal with blood samples all day. These diseases can easily transmit if the blood sample is not handled with all the necessary precautions. With the help of disposable vacuum blood collection tubes, nurses and hospital staff can extract blood from patients without contacting the blood. This is because the vacuum tubes are mostly in a closed state. http://www.china-yongkang.com/blood-collection-tube/