So far it has proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.07

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

VOA: special.2009.05.20

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 study in Benin found that solar-powered pumps are effective in supplying water, especially during the long dry season.

VOA: special.2010.01.11

The National Council on Teacher Quality is a research group that works to increase the number of effective teachers.

VOA: special.2011.08.11

One is a belief that a government is stable and that the justice and legal systems are fair and effective.

VOA: special.2009.12.19

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

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

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

In the United States, the Armed Forces Radiobiology Research Institute is looking for more-effective treatments for radiation exposure.

VOA: special.2011.03.30

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

VOA: special.2010.01.18

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

VOA: special.2010.04.21

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