Essay on Human Body 's Immune System

1030 Words Nov 11th, 2015 null Page
Once the human body has been exposed to, and therefore infected by foreign bacteria, the infectious agents travel through the body via the bloodstream and the lymph nodes. After this infection occurs these bacteria now, in the body are planktonic. This means they are individual, free swimming, and virtually functioning as single celled organisms. When these bacteria are threatened by the host’s immune system or antibiotics they form biofilms. A biofilm is a thin coating of organic as well as inorganic matter that contains bacteria that have fused together and permanently anchored themselves to an object or body surface in contact with water. Bacterial biofilms commonly form on teeth, heart valves, urinary tracts, and even the inner lining of urinary catheter tubes. When bacteria are present in biofilms, they are much stronger and much more efficient than planktonic bacteria. Planktonic bacteria can be targeted, controlled, and killed with antibacterial drugs; whereas biofilms are much more difficult to eradicate because they are able to resist antibiotics. Biofilm formation begins with attachment of bacteria to a surface within the body that has been preconditioned with proteins from the host’s immune system. The host’s immune system has a major role in fighting infection and biofilm formation. When an infection occurs in the human body, the non-specific immune system takes action with the first and second lines of defense against harmful microbes. Non-specific immunity…

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