Topic 3

Pathogens - microorganisms that neter the body and cause disease 

Bacteria - very small living cells that make you fell ill by producing toxins that damage your cells and tissues 

Viruses - viruses are not cells but like bacteria they reproduce rapidl in the body , they replicate themselves in your cells . Then the cell will usually burst relasing all the new viruses. This cell damage makes you feel ill.

Protists - Single celled eukaryotes , some protists are parasites.

Fungi - Fungi can grow an dpenetrate human skin and cause disease.

There are three main ways pathogens are spread :

1) Water

2) Air

3) Direct contact 

Measles 

Measles is a viral disease , it is spread through droplets from an infected persons sneeze or cough. Infected people will develop a red skin rash and they will show signs of a fever. Measles can be very serious or sometimes fatal. 

HIV

HIV is once again a…