Bacteria, viruses, fungi and protozoa.
Viruses are not cells - protein coat around strand of genetic material.
Can only reproduce inside living cells, so must infect organisms to multiply.
Viruses can infect plant, animal and bacterial cells.
A particular type of virus will only attack specific cells.
- Virus attaches onto specific host cell and injects genetic materal into cell
- Virus uses host cell to make components of new viruses
- Causes host cell to split open releasing new viruses
Diseases can be transmitted in different ways:
- In food - food poisoning, illness from eating bacteria-contaminated food, prevented by good…