Additional risks from unsafe injection practices result primarily from sharing materials (needles, cookers, syringes) used in injection.[6] Blood-borne pathogens, such as HIV, Hepatitis B, and Hepatitis C are of particular concern among injection drug users who share supplies, and increase the likelihood of infection.[6] An added challenge, is that not only infected individuals know their positive status and continue to share supplies, placing other users at risk for infection as well.[6] 30-50% of adults will not experience acute Hepatitis B symptoms, and those that do experience lethargy, nausea, upper abdominal pain, muscle aches, or a darkening of urine will need to connect these symptoms to a possible infection to seek care and limit spreading of the virus.[6]