Such factors may be biological (sexually transmitted diseases, e.g., syphilis), behavioral (unprotected sexual behaviors, overlapping bisexual and commercial sex, and increasing substance use), or sociocultural/environmental (e.g., migration, stigma, and social support).
Health risk behaviors in adolescents and youth, such as smoking, alcohol, drug use, violence, suicide, and unprotected sexual behavior, are issues of major public health concern.
Among participants who had two or more sex partners at baseline, unprotected sexual behavior was reduced 38%.
Therefore, natural variation in MRJ-L levels in macrophages and unprotected sex behavior may be the major determinants of susceptibility to HIV-1 infection.
And developing countries [ 8] which found that the likelihood of engaging in unprotected sexual behavior was not higher among persons receiving ART compared to those not receiving ART.
Without correct sexual knowledge, unprotected sexual behavior is more likely to lead to the spread of HIV infection, and to increased abortions, unwanted childbearing, or premature and unwanted marriage.
Significant correlation was found between HBV infection and drug abuse, level of education and place of residence (p<0.05), while no significant correlation was found between HBV infection and previous history of blood transfusion, unprotected sexual behavior, and thalassemia.
This finding indicates that men with higher mobility (i.e., higher risk for multiple sex partners and unprotected sexual behavior) should receive more attention with regard to future HPV control in this region.
A potential explanation for this age-related trend might be that in this population, young adults more commonly work for long periods outside the rural home area than do older adults (data not shown), and the increased mobility might be associated with more unprotected sexual behavior and consequent increased exposure to HPV (10 ).
Similar evidence was also reported among MSM students by recent study, which found that unprotected homosexual behavior accounted more and more HIV infection among reported HIV infection cases in China, male-to-male homosexual route infection accounted for 17.5% of the total reported student HIV infection cases in 2006, but this figure rapidly increased to 62.4% in 2009 [ 31].
