anaphylaxis
noun [ U ] medical specialized uk/ˌæn.ə.fɪlˈæk.sɪs/ us/ˌæn.ə.fɪlˈæk.sɪs/ (also anaphylactic shock, /æn.ə.fɪlˌæk.tɪk ˈʃɒk/ /æn.ə.fɪlˌæk.tɪk ˈʃɑːk/)
过敏性反应
an extreme and dangerous allergic reaction to something that a person has eaten or touched
In severe cases, anaphylaxis - the swelling of the tongue and closing of the throat - can occur and is life-threatening. 情况严重时会发生过敏性反应，如舌头肿大和喉咙闭塞等，有生命危险。
Scientists believe a bite from a tick can lead to anaphylactic shock. 科学家相信被壁虱咬了可能会导致过敏性反应休克。