RT Journal Article SR Electronic T1 Intractable problems require novel solutions: it's time to get serious about developing a gonorrhoea vaccine JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 561 OP 562 DO 10.1136/sextrans-2015-052378 VO 92 IS 8 A1 Evgeny A Semchenko A1 Kate L Seib YR 2016 UL http://sti.bmj.com/content/92/8/561.abstract AB