Flu, or influenza is a contagious disease caused by influenza virus. If you have high fever (39-40 ºC), headache, severe cough, extreme fatigue, aches and pain, you may have flu. Unlike a common cold, flu causes severe illness and life-threatening complications in many people.
流感是由流感过滤性病毒引起的传染病，传染性极高，患者会有发烧的情况，而且达到摄氏39至40度，并有头痛、严重咳嗽、极度疲倦、骨痛及肌肉痛等徵状。流感跟伤风最大的分别是流感可以引起严重疾病，甚至是致命的并发症。
When is the best time to get a flu vaccination?
什麼是注射流感疫苗的最佳时候？
Vaccination should happen before the flu season every year when the new vaccine becomes available, but it will never be too late to get vaccinated even during the flu season.
每年大约八月至九月期间，当新一年度的流感疫苗到达香港时，便是我们接受疫苗注射的最佳时候，我们可以因此在流感高峰期前得到保护，而且可以维持一年。
Is the flu vaccine safe?
流感疫苗安全吗？
The vaccine will not give you flu. It contains noninfectious killed virus, but merely alerts the body to the threat of the virus.
Flu vaccines are well tolerated and safe. The most frequently associated reaction is mild soreness at the injection site that can last for 24 to 48 hours.
流感疫苗十分安全。它的主要成份是一些已被完全杀死的流感病毒，所以绝不会致病。流感疫苗的功效是令身体自动产生抗体抵御流感病毒的入侵。
在注射疫苗后，最常见的反应只是注射的部位有轻微的痛楚和红肿，而且一般不会持超过24至48小时。
What will flu vaccination do for me?
流感疫苗对我们有什麼好处？
- Life-saving for people at risk
- Avoidance of illness and hospitalization
- Avoidance of absenteeism from work or spoiling holidays
- Reduction of the risk of transmitting flu to family members, friends or co-workers
- 减低高危人仕由流感引至的死亡率
- 避免因流感而生病入院
- 避免因流感而不能上班、上学、甚至浪费计划好了的宝贵假期
- 减少把流感病毒传给家人、朋友或同事的机会
Why should I get a flu shot every year?
为什麼每年都要接受流感疫苗防疫注射？
The flu viruses are constantly changing. Generally, new influenza virus strains circulate every flu season, so each year, before flu season, the most active viruses are identified by WHO and included in a new vaccine formula in order to offer the best protection.
流感病毒经常变种。一般来说，每个流感季节也有新品种的流感病毒出现。因此每年在流感季节前，世界卫生组织都会找出最活跃的流感病毒，以用作制造新疫苗的配方。而且流感免疫力会随时间降低，一年后可能会降低至没有保护作用的水平，因此我们必须每年重新注射流感疫苗。
Who is at high risk of developing complications?
哪些人仕是流感高危群？
Some people are at an increased risk of developing life threatening complications if they contact flu, e.g. the elderly, adults and children who have diabetes, asthma, and chronic heart, lung and kidney disease.
他们包括长者，糖尿病患者，哮喘病患者，心脏病患者，肺病患者或肾病患者等。这些人患上流感后，会特别容易出现严重疾病或致命的并发症。
Who is not suitable for vaccination?
哪些人仕不适宜注射流感疫苗？
People who are hypersensitive to active substances, to any of the excipients, to eggs, chicken proteins, neomycin, formaldehyde and octoxinol 9. Immunisation should be postponed in patients with febrile illness or acute infection.
凡对鸡蛋，新霉素，甲醛，辛苯昔醇9或曾对流感疫苗有过敏反应者，都不宜接受流感疫苗注射。如注射当日有发烧，或急性感染的情况，请於病愈后接受注射。
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