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用于１９９８～１９９９年流感季节的新型三价肌注流感疫苗现已面世。１９９７年的疫苗效用比以往有所降低，其原因是在选用疫苗抗原之后出现了一种新的病毒变异体Ａ／Ｓｙｄｎｅｙ／５／９７。这种新疫苗中的抗原包括Ａ／Ｂｅｉｊｉｎｇ／２６２／９５样（Ｈ１Ｎ１）、Ａ
A new trivalent intramuscular influenza vaccine for the flu season of 1998-99 is now available. Vaccine efficacy in 1997 was lower than in the past due to the emergence of a new virus variant, A / Sydney / 5/97, following vaccine antigen selection. Antigens in this new vaccine include A / Bei-jing / 262/95-like (H1N1), A.