Bacteria Viruses and Illness Bacteria Viruses and Illness

Bacteria, Viruses and Illness

Bacteria, Viruses and Illness • WALT: identify some illnesses caused by bacteria and viruses and explain how some diseases can be prevented • I must be able to describe one disease caused by bacteria and one disease caused by a virus • I should identify how certain illnesses can be prevented

Last lesson we learnt that …. . Examples of drugs are…………… A depressant is ………. A stimulant is………….

Watch the clip about sanitation in Kibera…. http: //www. youtube. com/watch? v=5 KVNjhx 8 wl. Y • Whilst you are watching, make a list of things you see that you think are a health hazard (i. e. a danger to our health) • What are the people doing to try to improve things?

Bacteria • Can be harmful (e. g. salmonella) • And can be useful (e. g. in our gut) • Antibiotics can be used to kill bacteria

You should now have an agar plate with three different colonies of bacteria Finger print Saliva Food

Viruses • Harmful organisms that only live inside the cells of other organisms • Often passed on through coughing, sneezing or touching something that someone sick has touched with contaminated hands • Antibiotics will not help. • Eg. – HIV – Flu (influenza) – Colds – Norovirus (vomiting bug)

…but not all illnesses are caused by bacteria and viruses. • Worms are common in Africa – http: //www. youtube. com/watch? v=1 Do. GAEPz. Ab 4 – http: //www. youtube. com/watch? v=0 RQ 4 -Q 7 V 5 PM (WARNING – LOOK AWAY IF YOU ARE SQUEAMISH – VERY GROSS VIDEO) • Some illnesses are genetic (inherited from our parents or grandparents) – e. g. sickle-cell aneamia or cystic fibrosis • Other illnesses are caused by poor lifestyle choices (e. g. heart disease, lung cancer etc)