The natural immune system fights off foreign pathogens, such as bacteria and viruses. Specific immune cells, called B-lymphocytes or B-cells, identify proteins called antigens on the surface of invading cells.
When a B cell detects an antigen, it causes the production of proteins, called antibodies, that bind to antigens.
When B cells produce an antibody, they can continue making the antibody if the same antigen appears in the future. It is called adaptive immunity.
Immunity offers protection that extends beyond the personal level. For example, when individuals have developed an adequate antibody response, benefits such as “herd immunity” become possible.
Herd immunity occurs when a percentage of a population develops immunity to an infectious disease.
Pingback: slot
Pingback: one championship
Pingback: water sounds
Pingback: cafe music
Pingback: รับงานเชื่อมเหล็ก
Pingback: 555BET CASINO ONLINE
Pingback: ไซด์ไลน์
Pingback: วิธีแทงบอลสเต็ป ง่ายๆ บนมือถือ เล่นได้ที่ LSM99
Pingback: เช่ารถตู้พร้อมคนขับ
Pingback: 꽁머니 환전
Pingback: 파워볼 검증사이트