London has made real progress in reducing new HIV diagnosis.

And that's because we know what works.

Be sure, know the four ways to prevent HIV.

One, test regularly and know your status.

Two, condoms can prevent HIV and other sexually transmitted infections.

Three, prep is a pill which can prevent HIV.

Four, undetectable.

Also known as U equals U.

Means people living with HIV on treatment cannot pass it on.

Be sure, know the four.

Visit doitlandon.org.

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