HE101 Lecture Notes - Lecture 6: Blood Transfusion, Methicillin, Listeriosis
Document Summary
Why: ecological changes, population growth, drug resistance, international trade & travel, inadequate public health, choosing not to vaccinate. Many pathogens: mortality related to small # of diseases in canada several public health agencies, public health agency of canada, ontario ministry of health and long-term care, regional public health departments. Non-modifiable risk factors: age, heredity, environmental conditions. Modifiable risk factors: poor diet, physical inactivity, stress, inadequate sleep, drug misuse or abuse, poor personal hygiene. Autoinoculation (bacteria moved from one side of the body to another) **greatest source of transmission is your hands** Airborne or waterborne pathogens food - borne pathogens **think of salmonella and e. coli** animal- born pathogens. 1st line of defense skin: protective barrier against pathogens (both physical and chemical) Gi system: hcl acid in stomach, gut bacteria. Mucous membranes & cilia: trap invading pathogens. Immunity: ability to resist disease by counteracting the invading pathogen. Antigens: foreign substances trigger immune response. Immune system: network of cells, tissues, organs.
