Which explains the declining rate of HIV infections in recent years?

• better educational efforts
• more effective blood screening

These two factors are likely contributing to the declining rate of HIV infections in recent years. Better education about safe sex practices and the importance of HIV testing can help prevent new infections. Additionally, more effective blood screening methods have helped reduce the transmission of HIV through blood transfusions and organ donations. Access to vaccines is not currently a major factor in the declining rate of HIV infections, as there is currently no widely available vaccine for HIV. Changing patterns of IV drug use may also play a role, but it is not as significant as the other factors listed.