Microbiology and Immunology 3820A Lecture Notes - Lecture 1: Cell Potency, Antibody, Breast Milk

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Why do we have an immune system: aka: transferable diseases, communicable. To protect us from microorganisms with potential to cause infectious disease, called pathogenic microorganisms or pathogens. Different kids: bacteria, virus, parasite, fungi diseases. Number of pathogens that cause serious human infections: bacteria (538), fungi (317), worms (287), viruses (208), parasitic protozoa (57) 10 most burdensome infectious diseases in ontario. Human immunodeficiency virus (hiv/aids)* The immune system has to decide if something is a threat (uses cells and proteins to sense threats: 1. External threat allergy (pollen, cat: 2. Internal threat normal cell is damaged and commits suicide (apoptosis), example of uncontrolled - cancer. Autoimmune disease when the immune system attacks itself. Diabetes immune cells (t cells) attack insulin producing cells in the pancreas (beta cells) Microorganisms have the advantage of reproducing and evolving extremely quickly. Host (immune system) health or infectious disease . Pathogen (bacteria, virus, fungi, parasites) Remain the leading cause of death worldwide.

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