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Unit 1 Viruses and Bacteria
Diseases caused by viruses range from the common cold to HIV, and can be either
temporary and relatively harmless or life-long and potentially deadly. While there is no
real cure for viral diseases, vaccines and antiviral drugs can help. Vaccines introduc e a
very small portion of the virus into the body, so that if a person does come in contact with
the virus, he or she is already immune to its effects. Antiviral drugs have only come into
being in the last 20 years or so, and work by halting the reproduction of the virus rather
than killing it. Bacterial infections are far easier to treat; antibiotic drugs work with the
immune system to quickly kill most infections.
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Diseases caused by viruses range from the common cold to HIV, and can be either
temporary and relatively harmless or life-long and potentially deadly. While there is no
real cure for viral diseases, vaccines and antiviral drugs can help. Vaccines introduc e a
very small portion of the virus into the body, so that if a person does come in contact with
the virus, he or she is already immune to its effects. Antiviral drugs have only come into
being in the last 20 years or so, and work by halting the reproduction of the virus rather
than killing it. Bacterial infections are far easier to treat; antibiotic drugs work with the
immune system to quickly kill most infections.
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