Introduction and aims
Sexual transmitted diseases present an increasing incidence among adolescents. Data about behaviourally HIV infected adolescents is scarce, especially in Europe. Describing this population will contribute to better approach this problematic situation. 

Methods
Description of HIV new infections in patients 12-18 years-old included in CoRISpe Spanish database until December 2016. Demographic, clinical, biological data and way of transmission were analysed. 

Results
For 25 adolescents a new diagnosis of HIV was made. Median age at diagnosis was 15.5 years (12.3 – 17.8) and 60% were male. The main way of infection was sexual (18 patients, 72%, 10 heterosexual, 8 homosexual), followed by transfusion/haemophilia (2), possibly vertical (2) and unknown (3). For periods, the average rate of sexual infections was 62.5% until 2013 and increased to 89% in 2014-2016.  Contribution of homosexual transmission passed from 14% total diagnosis in 2008-2010 to 67% in 2014-2016. 20% of sexual infections were homosexual in 2008-2010 vs 75% in 2014-2016.
64% of adolescents were born outside of Spain; 61% for sexually infected. From the foreigners, 82% were Latin-American for the sexually infected vs 56% for the global.  
Looking to the CD4 rate, late diagnosis (<350/mm³) was made for 12 patients (48%); 8 (32%) of whom were very late (<200/mm³). The proportion of late diagnoses was 56.3% for the foreigners and 33.3% for those born in Spain. In the sexually infected subgroup, in 5 cases the diagnosis was late (29.4%), of whom 2 (11.8%) were very late. 

Conclusions
There is an increasing contribution of the sexual way of transmission in new HIV infections among adolescents. These adolescents were mainly born in Latinamerica. Almost one third of adolescents with sexual transmission were late diagnoses, which emphasizes the vulnerability of this population and the need to develop specific measures.

CONTRIBUTION OF SEXUAL INFECTIONS IN NEW HIV DIAGNOSES IN ADOLESCENTS IN SPAIN