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Active Immunity • This occurs when the body creates the antibodies for itself and creates a new population of T cells and B memory cells • Immunity can last a lifetime – B memory cells and T memory cells are created • Two types – Natural and Induced/Artificial Natural Active Immunity • The body makes the antibodies • Occurs when the person comes into contact with the pathogen cold, flu, chicken pox • Immunity can last a lifetime B memory cells produced Induced/Artificial Active immunity • The body make the antibodies • Occurs when a person is vaccinated eg polio, meningococcal • Immunity can last a lifetime B memory cells produced Injections – Vaccination • Dead organism • Small dose of live organism (eg. Polio) • Attenuated organism – remove disease causing capacity • Toxin – treated venom • Designer protein vaccinations (eg. Hep B and meningococcal) Why do we still get sick? • Bacteria have a capsule that can hide antigens from the immune system • Viruses can mutate from year to year changing their protein coat so the B memory cells do not recognise the virus Active Immunity Number of antibodies Primary response Secondary response Time Passive Immunity • The body does not make the antibodies • Lasts only a short amount of time as no B memory cells are created • Immediate protection • Two types natural and induced/artificial Induced/Artificial Passive Immunity • Antivenom given after a snake bite (rabbits antibody factories) • Injections of Immunoglobins (antibodies) • No B or T memory cells created • Last 2-3 weeks Natural Passive Immunity • Antibodies can move across the placenta to a baby • Colostrum thick milk produced by a mother for a few days after giving birth Passive Immunity Level of antibody Time Problems with the immune system Things that can go wrong Rhesus Factor • Markers found on red blood cell • People are either positive (have proteins on their surface) or negative( have no proteins on their surface Rhesus negative Rhesus Positive Mum Rh -ve Blood types • Blood type A • Blood type B • Blood type AB • Blood type O Blood transfusions • • • • Blood type A has Antibodies to – Blood type B has Antibodies to – Blood type AB has Antibodies to – Blood type O has Antibodies to - Blood transfusions • Blood type A can Donate to • Blood type B can Donate to • Blood type AB can Donate to • Blood type O can Donate to Blood type transfusions • Blood type A can accept from – • Blood type B can accept from – • Blood type AB can accept from – • Blood type O can accept from - Transplants • • • • Rejection of tissue Only identical twins have the same markers T helper cell identifies tissue Cyclosporin suppresses T cell highly toxic to kidneys • Need to match markers closely Auto immune diseases • Arthritis – joint cartilage • Multiple sclerosis – myelin layers around axon degenerates Allergies • Mast cells and Basophil cells • Mast cells located around blood vessels, connective tissue, lining of gut and lungs • Both contain large numbers of histamine – contraction of smooth muscle