- Bacteria
These
one-cell organisms are responsible for illnesses such as throat infection,
pneumonia and tuberculosis.
- Viruses
Even
smaller than bacteria, viruses cause a multitude of diseases — ranging from the
common cold to AIDS.
- Fungi
Many
skin diseases, such as ringworm and athlete's foot, are caused by fungi. Other
types of fungi can infect your lungs or nervous system.
- Parasites
Malaria
is caused by a tiny parasite that is transmitted by a mosquito bite. Other
parasites may be transmitted to humans from animal feces.
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