Unlike antibiotics (抗生素), interferon does not attack germs directly. Instead, it protects healthy cells from being infected, and prevents the reproduction of viruses within cells.

　　As you might conclude, one of the most special uses of interferon has been in the treatment of cancer. Dr. Hans Strander, a research physician at Sweden’s famous Karolinska Institute, has treated more than one hundred cancer patients with the new drug. Among a group of selected patients who had received operations for advanced cancer, half were given

　　traditional treatments and the other half were given interferon. Among those treated with interferon 70 percent of them remained alive over three years, as compared with only 10 to 30 percent among those who had received the traditional treatments.

　　In the United States, a large-scale project supported by the American Cancer Society is now under way. If the experiment were successful, interferon could become one of the greatest medical discoveries of our time.

　　5.What is the difference between antibiotics and interferon?

　　A. Interferon has serious side effects, while antibiotics do not.

　　B. Antibiotics kill germs by attacking them directly, while interferon does not.

　　C. Antibiotics are very effective, while the effect of interferon is limited.

　　D. They are different in structure, although they are both proteins.

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