People learning through genetic testing that they might be susceptible to devastating diseases wouldn't also have to worry about losing their jobs or their health insurance under anti-discrimination legislation the Senate passed Thursday.

The bill, described by Sen. Edward Kennedy as ''the first major new civil rights bill of the new century,'' would bar health insurance companies from using genetic information to set premiums or determine enrollment eligibility. Similarly, employers could not use genetic information in hiring, firing or promotion decisions.

''For the first time we act to prevent discrimination before it has taken firm hold and that's why this legislation is unique and groundbreaking,'' said Sen. Olympia Snowe.

There are more than 1,100 genetic tests available today, she said, but these are ''absolutely useless'' if fear of discrimination discourages people from taking tests or participating in clinical trials.