1. The Body’s Natural Defences

2. White Blood Cells

3. Semmelweiss

Isobel Houston

1. The Body’s Natural Defences

Skin acts as a barrier against pathogens

Tears contain enzymes that kill bacteria

If you get cut, blood clots to seal

the wound

ACHHHOOOO!!

Eye lids and eyelashesprevent dust and

germs from getting into your eye

Your stomach produces acid

to kill microbes in

our food

Saliva contains an enzyme which destroys any

microbes that enter into the mouth

with food

Coughing and sneezingget rid of dust in

your lungs

2. WHITE BLOOD CELLS:ATTACK OF THE PATHOGENS

Starring...

ANTITOXINS

BacteriaToxin molecule

Toxin and antitoxin joined together

Antitoxin molecule

White blood cellNeutralising

the pathogens!Making

pathogens less harmful!

Also...

ANTIBODIES

White blood cell

Bacteria

Antigen

Antibody attached to bacterium

Antibody

Killing the

pathogen!

Not forgetting...

INGESTING MICROBES

White blood cell

Bacteria

Ingesting the pathogen to stop them

causing disease!

Like Pac Man!

3. Ignaz Semmelweiss

Ignaz Philipp Semmelweiss is known as the "saviour of mothers” or the “father of infection control” because he discovered that the amount of deaths from childbed fever could be drastically cut if the medical students washed there hands after dissecting dead bodies.

He knew this but he couldn’t prove why it worked.

In the 1870s Robert Koch proved that bacteriacaused disease.

It then became compulsory to wash your handsbefore entering and leaving the different rooms in the hospital.

He died in 1865 from childbirth fever.