If not treated, nearly all those infected with HIV will develop AIDS, according to the National Institutes of Health.

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The programme includes a Catholic nun advising her HIV-infected choir master not to use condoms with his wife because "the virus can pass through".

BBC: NEWS | Health | Vatican in HIV condom row

"We estimate that roughly half of all people living with HIV either don't know that they are infected, or they are not in care, or both, " said Dr Harold Jaffe, an acting director of the National Center for HIV at the CDC.

BBC: US HIV cases 'on the rise'

The researchers found that HIV positive women are infected more frequently and more severely with malaria compared to women who do not have the virus.

BBC: NEWS | Health | Malaria increases baby's HIV risk