Infectious Diseases

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Information about Infectious Diseases

Published on March 1, 2014

Author: littlevagabond



An introduction to infectious diseases aimed at grade 10 level

Unscramble these key words:  cormbie  microbe  sediaes  disease  ptsmmyo  symptom  fctiinone  infection

Learning Objectives:    Understand that infectious diseases are spread by microbes. Know that there are three main types of microbes. Explain the causes of disease.

What causes diseases?  Most infectious diseases are caused by microorganisms: Viruses e.g. flu, smallpox, measles, mumps, HIV.  Bacteria e.g. tuberculosis, meningitis, legionella, cholera, tetanus.  Fungi e.g. yeast infection, tinea. 

Disease A disease is any condition where the body isn’t working as it should. This could be caused by a malfunction in the body (as with diabetes), or it could be caused by the two types of MICROBE: Bacteria Viruses •1/1000th mm big •1/1,000,000th mm big •Living cells (some are harmless) •Genetic info inside a protein coat •Grow very quickly •Not affected by antibiotics •Affected by antibiotics •Release poisons •Examples: food poisoning, tetanus, sore throats •Examples: colds, flu, polio, chicken pox

Fungi Fungi are another form of microbe. There are many different varieties ranging from bread mould to mushrooms.

8C Getting smaller!

8C Even smaller!

8C Bacteria or viruses?

How are diseases spread?   Malaria is caused by any one of four species of one-celled parasites, called Plasmodium. The parasite is spread to people by the female Anopheles mosquito, which feeds on human blood.

How are diseases spread?   Athlete’s foot is a fungal infection. It can lead to intense itching, cracked, blistered or peeling areas of skin, redness and scaling. Spreads easily, typically communal areas such as pools, showers and changing rooms or anywhere where you may walk around barefooted

Think of another infection   In pairs, think of another infection. Describe how it is spread - write it in your book.

Growing Microorganisms  What do microorganisms need to be able to grow and replicate? Food  Water  Warmth 

Doubling every time    If you start with just one microorganism In ideal conditions bacteria reproduce about every 20 minutes. Work out how many bacteria could be made in a school day.

Think - Pair - Share In 2010, a computer programmer contracted Malaria while on holiday. After 1 week, he is only able to speak in computer code. In pairs, try and work out why this happened?

8C Catch that! Match each sentence with the correct ending: 1 Chicken pox can be spread by… A…blood C…touch.transfer. 2 Salmonella can be spread by... B…sexual intercourse. D…eating contaminated food. 3 Hepatitis and HIV can be spread by... C…touch. A…blood transfer. 4 Colds and flu can be spread by… D…eating contaminated food. F… droplets from a cough or sneeze. E…drinking contaminated water. water. 5 Typhoid and gastro-enteritis can be spread by… 6 Syphilis and HIV can be spread by… F… droplets from a cough B…sexual intercourse. or sneeze.

8C Tiny truths and little lies True or False? 1. All bacteria cause illness. FALSE 2. Viruses can only reproduce inside living cells. TRUE 3. We can eat some fungi. TRUE 4. Live yoghurt contains living bacteria. TRUE 5. Antibiotics can destroy viruses. FALSE

8C Tiny truths and little lies True or False? 1. Viruses are bigger than bacteria. FALSE 2. We can see some fungi with the naked eye. TRUE 3. Viruses inject their genetic material into living cells. TRUE 4. Microbes grow easily in raw or cooked food left in a warm place. TRUE 5. Micro means ‘causes disease’. FALSE

Infectious Diseases Learning Objectives:    Understand that infectious diseases are spread by microbes. Know that there are three main types of microbes. Explain the causes of disease.

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