Effectiveness of any vaccine can vary from person to person and it even depends on where you are getting it from. According to the research, the flu vaccine is effective to the people to the extent of forty percent to sixty percent made for the desired flu virus. The effectiveness of the flu vaccine can depend on from season to season. The vaccine performance also differs in different persons. However, the most important factor that determines the vaccine effectiveness is the extent of matching the vaccine material with the virus for which it is used for treating. Though it is difficult to measure the effectiveness of a flu vaccine but in the most cases its effective and beneficial. 疫苗效果如何？ 任何疫苗的有效性可能因人而異，甚至取決於您從何處獲得。根據研究，流感疫苗對人們有效，達到所需流感病毒的百分之四十到百分之六十。流感疫苗的有效性可能因季節而異。疫苗的性能也因人而異。但是，決定疫苗有效性的最重要因素是疫苗材料與用於治療的病毒的匹配程度。儘管很難衡量流感疫苗的有效性，但在大多數情況下它是有效和有益的。