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In this study influenza vaccine was not effective against either
influenza A (30%, 95% CI -85, 74) or influenza B (-45%, 95% CI -684, 75)
in 6- to 11-month-old infants, but it was effective in children over 1
year old (Table 2).
Indirect protection attributable to the mass vaccination program of
schoolchildren in Japan in the 1960s to 1980s protected young children
1–4 years of age against influenza encephalopathy [17,19].
Young children did not receive influenza vaccine in the 1960s to 1980s.
On the other hand, traditional cohort studies to estimate VE may have
yielded excessively high VE for infants. One study reported 42%-69% VE
in infants [34].
Since siblings and/or parents in families in which an infant has
received influenza vaccine have usually also received influenza vaccine,
thereby providing highly effective indirect protection to their infants
whether indirect protection exists in the background should be noted
when interpreting reports on VE in children.¡¡Ëܸ¦µæ¤Ë¤ª¤¤¤Æ¡¢¥Õ¥ë¥ï¥¯¥Á¥ó¤Ï£¶¡Á11¥ö·î¤ÎÍÄ»ù¤ËÂФ·¤Æ¤ÏA·¿¡¢£Â·¿¤È¤â¤Ë͸ú¤Ç¤Ï¤Ê¤«¤Ã¤¿¤¬¡¢1ºÐ°Ê¾å¤ÎÍÄ»ù¤Ë¤Ï͸ú¤À¤Ã¤¿¡£ÆüËܤǤÏ1960ǯÂ夫¤é1980ǯÂå¤Þ¤Ç¡¢³Ø¹»¤Ë¤ª¤±¤ë½¸ÃÄͽËÉÀܼï¥×¥í¥°¥é¥à¤Î¤ª¤«¤²¤ÇÍÄ»ù¤¬´ÖÀÜŪ¤ËÊݸ¤ì¡¢£±¡Á£´ºÝ¤Þ¤Ç¤ÎÍÄ»ù¤Ï¡¢¥¤¥ó¥Õ¥ë¥¨¥ó¥¶Ç¾¾É¤«¤é¼é¤é¤ì¤Æ¤¤¤¿¡£¡ÊÃæά¡ËÅÁÅýŪ¤Ê¥³¥Û¡¼¥È¸¦µæ¤Ç¤Ï¡¢ÍÄ»ù¤ËÂФ¹¤ë¥ï¥¯¥Á¥ó¤Î͸úÀ¤ò¶Ëü¤Ë¹â¤¯¿äÄꤷ¤Æ¤¤¤¿¤«¤â¤·¤ì¤Ê¤¤¡£¤¢¤ëÄ´ºº¤Ç¤ÏÍÄ»ù¤ËÂФ¹¤ë͸úΨ¤Ï42%¡Á69%¤È¤µ¤ì¤Æ¤¤¤¿¡£¥¤¥ó¥Õ¥ë¥¨¥ó¥¶¡¦¥ï¥¯¥Á¥ó¤ò¼õ¤±¤¿ÍÄ»ù¤Î²ÈÄí¤Ç¤Ï¡¢²È²¤â¥ï¥¯¥Á¥ó¤ò¼õ¤±¤Æ¤¤¤ë¤³¤È¤¬Â¿¤¯¡¢¤½¤ì¤¬ÍÄ»ù¤ËÈó¾ï¤Ë͸ú¤Ê´ÖÀÜŪ¤ÊÊݸî¤òÍ¿¤¨¤Æ¤¤¤¿¡£¤½¤Î¤¿¤á¡¢ÍÄ»ù¤Ø¤Î¥ï¥¯¥Á¥ó¤Î͸úÀ¤òȽÃǤ¹¤ë¾ì¹ç¡¢Çطʤˤ³¤Î¤è¤¦¤Ê´ÖÀÜŪÊݸ¸ºß¤¹¤ë¤«¤É¤¦¤«Ãí°Õ¤¬É¬ÍפÀ¡£
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