2004-2-10
This is the VOA Special English Health Report.
Here is a common situation: A
person gets sick with a high temperature, muscle pain and a cough.
The person goes to a doctor to ask for some antibiotics to treat the
infection. The doctor says the person has influenza which is caused
by a virus. Antibiotics are not effective against viruses. They only
treat infections caused by bacteria. But there are newer kinds of
medicines known as antivirals.
A case of the flu usually lasts a week or two. Scientists at the
United States Centers for Disease Control say early antiviral
treatment can shorten that time by about one day. But they say for
this to happen, people must take the medicine within the first two
days of sickness.
Four antiviral drugs are approved for use against influenza in
the United States. They mainly fight infections in the breathing
system. Each drug has possible side effects. In the United States, a
person must have an order from a doctor to receive these medicines.
Scientists say two of the four drugs are effective against the
infection caused by the type A influenza virus. They are not
effective against influenza type B. The other two drugs can treat
both. One of these antiviral medicines, called oseltamivir, can also
help prevent influenza.
Viruses invade cells and copy the genetic material inside in
order to reproduce. Some antivirals work by preventing this process.
Or they may interfere with the ability of the virus to connect
itself to the cell. Other antiviral drugs prevent the virus from
destroying the protective protein around a cell.
The first antiviral drugs were created in the nineteen-sixties. A
number of new antivirals were in common use by the
nineteen-nineties. Progress in the engineering of genes and the
science of molecular biology made these new medicines possible. Some
have helped patients suffering from diseases like hepatitis B in the
liver. Other kinds of antiviral drugs are able to suppress H-I-V,
the virus that causes AIDS, so a person lives longer.
Antibiotics are made from bacteria. The drugs contain organisms
that damage the cells of other microbes that cause sickness. The
British doctor Alexander Fleming discovered what is generally
accepted as the first antibiotic, penicillin. That was in
nineteen-twenty-eight. Penicillin did not come into common use,
however, until the nineteen-forties.
This VOA Special English Health Report was written by Jerilyn
Watson.