A new study in the journal Nature has shown some hopeful results from an experimental gel that might protect women from H.I.V.

VOA: special.2009.03.16

However,researchers say they will study why the gel did not protect in all cases.

VOA: special.2010.07.21

Some scientists say the amount of tenofovir in the gel may be too low.

VOA: special.2010.07.21