But defenses can be low for several reasons: There can be primary defects innate to the immune system and secondary defects acquired in the course of one’s life because of contracting diseases.
Tetapi, sistem pertahanan dapat melemah karena beberapa alasan: Karena sistem kekebalan seseorang mengalami kerusakan atau karena seseorang mengidap penyakit yang memakan unsur - unsur sistem kekebalan tubuhnya.