follow-up services. (4) To develop and disseminate public information and education programs for the detection and control of infections described in paragraph (1), with priority given to high-risk populations as determined by the Secretary. (5) To improve the education, training, and skills of health professionals in the detection and control of infections and the coordination of treatment of addiction and infectious diseases described in paragraph (1), with priority given to substance use disorder treatment providers, pediatricians and other primary care providers, obstetrician-gynecologists, infectious diseases clinicians, and HIV clinicians. (b) Laboratory procedures The Secretary may (directly or through grants to public and nonprofit private entities) carry out programs to provide for improvements in the quality of clinical-laboratory procedures regarding infections described in subsection (a)(1). (c) Definitions In this section: (1) The term Indian tribe has the meaning given that term in section 4 of the Indian Self-Determination and Education Assistance Act. (2) The term injection drug use means— (A) intravenous administration of a substance in schedule I under section 202 of the Controlled Substances Act