Microbiology and Immunology 2500A/B Lecture Notes - Lecture 5: Hand Sanitizer, Antigen, Antibiotics

• School: Western University
• Department: Microbiology and Immunology
• Course: Microbiology and Immunology 2500A/B
• Professor: Dimitrios J Dikeakos, John Mc Cormick, Kelly Lynn Summers

Document Summary

Pathogens = pathogenic microorganism = microorganisms with the potential to cause infectious diseases: bacteria, virus, parasite, fungi. Immune system has to decide if something is a threat or not and mount a response. Use cells and proteins to sense threats. External threat allergy: sometimes your immune system guesses it wrong and has an allergic reaction (immune response) to harmless pollen (antigen) Internal threat cancer: cells have a lifespan and 50 to 70 million cells die naturally by apoptosis daily, cancer cells avoid apoptosis and grow uncontrollably. Internal threat autoimmune disease: type i diabetes, t cells attack and destroy insulin. Immune system cells attack bodily cells producing cells of the pancreas. reproducing quickly. Microorganisms have the advantage of reproducing and evolving extremely quickly. Immune system has to try to keep up with pathogen that has entered body and. Infectious diseases (communicable diseases) are transmitted from one person to the next. Infectious diseases remain the leading cause of death worldwide.