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By Group 3 of 7W
Joey Li, Benson Lau,
Ronald Lee, Terry,
Viruses
• Viruses do not respire,
move, grow or feed
outside a living cell and
so show very limited
characteristics as living
things. However they
reproduce very rapidly
inside human body
cells taking over the
function of the nucleus
and forcing the cell to
make more viruses and
thereby spreading the
infection.
Bacteria
• Bacteria are cell-based
organisms that are very
much larger than viruses.
They do respire, move,
grow, feed and reproduce.
In dry conditions, they can
survive by producing hard
coats and becoming
inactive as spores. Spores
are easily spread in the air.
Fungi
• Fungi are cell-based
organisms similar to
bacteria. They like
the moist skin areas
of the body.
Common infectious diseases
Some information below, which shows six common infectious diseases,
the part of the body affected, and the infective agent or pathogen
which causes the illness - either Bacterium, Fungus or Virus. Infectious
Disease Site of body infection Pathogen.
Athlete's foot Moist skin
Fungus
Common cold Nasal passages
Virus
HIV Body immune system
Virus
Influenza (flu) Nasal passages
Virus
Tuberculosis (TB) Lungs
Bacterium
Salmonella Digestive system
Bacterium