關於流感疫苗
Each year, the World Health Organization recommends an influenza vaccine that includes three strains of influenza virus (two of type A and one of type B) based on the strains that were circulating worldwide during the previous flu seasons in the Southern and Northern Hemispheres. The vaccine is then produced for the next flu season.
Because influenza is a serious disease that results in both excess mortality and serious economic losses, many countries provide routine annual vaccination against influenza. The vaccine is recommended especially for elderly persons and persons with underlying chronic illness.
Due to cost and limited production globally, however, the vaccine is generally not available in developing countries.
If travelling to the Southern or Northern hemisphere during that area’s winter season when flu viruses are actively circulating, travellers should obtain this vaccine before they depart if possible.
排程
The flu vaccine is administered in one dose and must be repeated yearly since the vaccine changes to adjust to changes in the viruses.
副作用
流感疫苗通常耐受良好，很少出現嚴重問題。輕度副作用可能包括注射時出現的酸痛，發紅或腫脹，輕度發燒，喉嚨痛，肌肉酸痛，頭痛，瘙癢和疲勞。對雞蛋或蛋製品過敏的人不應服用此疫苗，因為它們可能會產生嚴重的過敏反應。
