Pathogens

PathogensPathogensLesson ObjectivesTo describe the differences between viruses and bacteria.To evaluate the contribution of Semmelweiss in controlling infection

Then write down a list of any diseases / illness you have had caused by pathogens.

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SO WHAT IS A SO WHAT IS A PATHOGEN?PATHOGEN?A pathogen is a disease causing microbe. These can be caused by bacteria or virus.

Infectious diseases are found all over the world. They are caused by a microorganism entering and attacking the body.

If you can pass the microorganism on this means you are infectious.

AQA Science © Nelson Thornes Ltd 2006 2

The structure of bacteriaThe structure of bacteriaCell membrane

Slime capsule Cell wall

Cytoplasm

Genetic material

Plasmids

Flagella

Science Photo Library/ Alfred Pasieka

The structure of a virusThe structure of a virus

Protein coat

Genetic material

Science Photo Library: Kari Lounatmaa


Types of bacteriaTypes of bacteria

Staphylococcus aureusStaphylococcus aureus


Photodisc 72(NT)/Duncan Smith

HOW PATHOGENS HOW PATHOGENS CAUSE DISEASE.CAUSE DISEASE.

Once these pathogens are inside your body they cause disease because they reproduce rapidly.

Bacteria do this by splitting in two. They often produce toxins at the same time.

Viruses actually take over cells, damaging and destroying them.


IGNAZ SEMMELWEISSIGNAZ SEMMELWEISS

H- In the mid 1850s, many women who gave birth in hospital died from childbed fever a few days after.

E- Semmelweiss realised his medical students went straight from dissecting dead bodies to delivering babies without washing their hands.



B - Next another doctor cut himself whislt working on a body and died from the same symptoms.

He become convinced an infectious agent was causing this.

I- On insisting his students washed their hands deaths significantly reduced.



F- However, his ideas were mocked by the medical community.

Doctors did not want to believe they were causing it.

In those days with no indoor plumbing and harsh chemicals washing hands was difficult.Then J and C followed by D



G- It is thought MRSA would be less of a problem if visitors washed their hands more.


WAS HE RIGHT?WAS HE RIGHT?


HomeworkWhat was the problem with thalidomide in the 1960s?

Pathogens

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