<prompt> tafsiri zifuatazo kutoka kwa swahili hadi kiingereza.daktari ripley ballou, ni mtafiti toka kampuni ya glaxo smith kline vaccines anasema huu ni wakati mzuri, amekuwa akifanyia kazi chanjo hii kwa miaka 30, anasema ndoto imetimia.  <response>: dr ripley ballou, head of research at gsk vaccines said that he had been working on the vaccine since the past 30 years and this was a hugely significant moment. 