Download 31.1 Pathogens and Human Illness

31.1 Pathogens and Human Illness
KEY CONCEPT
Germs cause many diseases in humans.
31.1 Pathogens and Human Illness
• Germ theory – states that
microorganisms cause diseases.
– proposed by Louis Pasteur
– Disease-causing
agents are
called
PATHOGENS.
31.1 Pathogens and Human Illness
There are different types of
pathogens.
• Bacteria - single-celled
organisms.
• Viruses - genetic material
surrounded by a protein coat.
• Fungi - multicellular or singlecelled
31.1 Pathogens and Human Illness
Different PATHOGENS cause common
infectious diseases.
31.1 Pathogens and Human Illness
Many methods are used to control
pathogens.
1. Antiseptics kill
pathogens OUTSIDE
of the body.
2. Antibiotics kill
pathogens INSIDE the
body.
31.1 Pathogens and Human Illness
Pathogens can enter the body in
different ways.
1. Indirect Contact
does not require
touching an infected
individual.
2. Direct Contact
requires touching an
infected individual.