But there are a lot of groups taking the old approach, taking the whole virus. Based on animal testing so far, it does not look like these will be successful. You can get successful results in the animals with some of these approaches but ultimately they are not going to work in a human population with many, many different strains of HIV.
雖然也有人採取傳統的方法，採集整個病毒，但從動物實驗來看，這種方法成功的機會不大；即使動物實驗成功了，用在人身上也還不一定可行。