Some experts say booster shots might still be needed every 10 years or so.

一些专家说，也许每过十年左右还要做一次加强注射。

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Sometimes infectious diseases can be passed on by adults who haven't gotten recommended booster shots, such as for whooping cough.

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The researchers will look to see if their immune systems respond to the booster shots in the same way that those of the rhesus macaque monkeys did.

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Merck and Aventis will immediately start giving booster shots based on Aventis' current version of the canarypox vaccine to 90 or more patients who have already participated in a test of Merck's adenovirus vaccine.

FORBES: Merck, Aventis Team On AIDS Vaccine