| antigenic variation |
Some species of disease agent seek to evade the hosts' defence mechanisms by altering their antigenic characteristics. The most extreme case of antigenic variation occurs in trypanosomiasis, where infection in the host usually takes the form of a series of parasitaemias each one of which involves a form of trypanosome antigenically different from the preceding one. This type of antigenic variation occurs during the course of a single infection.
출처: www.fao.org/Wairdocs/ILRI/x5436E/x5436e04.htm
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