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1. SARS usually appears in urban areas and infects human beings while the bird flu epidemic mainly pesters countryside and hits poultry.

2. This disease infects people from the alimentary canal and is one of the most common infectious diseases of the season.

3. Swine flu can be spread with a sneeze or handshake, but kills only a small fraction of the people it infects.

4. Hepatitis C also infects more than 60 million people in the region, but there is still no vaccine available to fight the hepatitis C virus.

5. The virus mainly infects birds, but is also known to infect human bodies mainly through mosquito biting.

6. For decades, the common wisdom was that HIV easily enters and infects Langerhans cells.

7. Global economic growth looks likely to slow markedly in the months ahead as further weakness in the US infects Asia and Europe.

8. It infects computers running Microsoft's Windows NT or 2000 operating systems and its Internet Information Server Web server software.

9. It typically infects the pulmonary and urinary tracts, as well as burns and puncture wounds.

10. The disease infects about 320 million Africans south of the Sahara and costs the continent $ 12 billion.