What are the differences between bacteria and viruses
How do Pathogens cause disease
How did Ignaz Sammelweiss change the way we look at disease
Key notes
Bacteria are a single cell organism that are much smaller than animal or plant cells
Viruses are even smaller than bacteria. they usually have a regular shape. Viruses use and damage your cells as they reproduce
Pathogens reproduce rapidly. Bacteria split in two. they often produce toxins
Ignaz Sammelweiss discovered that the diseases of a patient a doctor was treating were passed to him and he infected his next patient if he didn't wsh his hands
many types of bacteria have developeed antibiotic resistence as a result of natural selection. To prevent the problem getting worse we must not over use antibiotics
If bacteria or viruses mutate, new strains of a disease can appear which spread rapidly to cause epidemics or pandemics
1 of 3
Defence Mechanisms and Using Drugs to treat diseas
Learning Objectives
How does your body stop pathogens from getting in
How do white blood cells protect us from disease
what is a medicine
Why cant we use antibiotics to treat diseases caused by viruses
2 of 3
Defence Mechanisms and Using Drugs to treat diseas
Key notes
Your body has several methods of defending itselfagainst the entryt of pathogens using the skin, mucus of the breathing systemand the clottin of the blood
Your white blood cells help to defend against pathogens by ingesting, making anti-toxins and making anti-bodies
Some medicines can treat the symptons but not the pathogens known as painkillers and some kill the pathogens known as antibiotics. Antibiotics only cure bacterial diseases
Antibiotic do not destroy viruses because virusesreproduce inside the cells. It is difficult to develop drugs that can destroy the viruses without harming the bodys cells
Comments
No comments have yet been made