6 months on 如何翻译？
Six months on since the virus was first discovered in one of the blood banks of Shemkent, thousands of children across the country are still being tested.
此段出自一段新闻。原文大意是：哈萨克斯坦医疗机构因渎职导致众多人口因输血感染HIV病毒。Shemkent是该国一城市名。不知这个on怎么理解，怎么翻译？
参考答案:on 这里是持续的意思，Six months on持续了六个星期．