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. 2005 Mar 12;330(7491):590–593. doi: 10.1136/bmj.330.7491.590

Table 1.

Risk factors for sexually transmitted infections in adolescence

• Unsafe sex
• Multiple, sequential sexual partners
• Concurrent partners
• Mental health problems
• Concurrent substance misuse
• Physiological immaturity (chlamydia seems to easily infect the immature cervix, making teenage girls more susceptible to infection than adults)