The antivenom that cures the bite of one kind of snake may not be effective for another kind of snake.

VOA: special.2009.05.05

The Race to the Top competition will look for states and local school systems with effective reforms in four areas.

VOA: special.2009.07.30

Life expectancy rates climbed, because doctors and scientists developed effective ways to prevent or treat diseases such as tuberculosis, typhoid,diphtheria,and influenza.

VOA: special.2010.12.02

The vaccine has already proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.22

Some economists say this second round of what is known as quantitative easing, or "QE2," has not been effective.

VOA: special.2011.04.29

The rules were reformed after three studies showed that the hands-only method was just as effective as traditional CPR.

VOA: special.2009.06.09

Some economists think the plan needs to provide as much as one trillion dollars or more to be effective.

VOA: special.2009.01.09

The Centers for Disease Control says HEPA filters are effective in clearing the air of many particles that cause disease.

VOA: special.2009.07.14

Carol Pandak says tests found the new vaccine to be thirty percent more effective than the trivalent vaccine.

VOA: special.2010.01.18

A team from Massachusetts General Hospital and Sweden's Lund University studied how effective the biomarkers are as predictors.

VOA: special.2009.07.15

He says each new version of one bill is weaker and less effective than the one before it.

VOA: special.2010.04.21

"If I felt that I could have been increasingly effective in that job, I suppose I would have continued to do it.

VOA: special.2010.05.09

DDT and other pesticides had become popular with the public and the government because they were so effective.

VOA: special.2010.03.14

He says there is clear evidence of the kinds of policies and programming interventions that can be most effective in combating the problem.

VOA: special.2010.05.17