卫生官员说，2004年10月和11月，就脊髓灰质炎在非洲的暴发开展了大规模协调一致的免疫接种运动，自这一最初反应以来取得的进展是积极的，但也是不稳定的。
Health officials say that progress made since the first response to the outbreak in Africa - massive co-ordinated immunization campaigns in October and November 2004 - has been positive but fragile.
这种不稳定性可以通过在胶体表面覆盖蛋白分子比如免疫球蛋白来抑制。
This instability can be prevented by coating the colloidal surfaces with protein molecules such as immunoglobulin.
而炎症与免疫可能是导致斑块不稳定的主要因素。
The inflammation and immunity may be the main factors which lead to unstable plaque.
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