IHBSS Inclusion Criteria:
RFSW: Born female, 15 years and older, who had sex in exchange of cash or payment in kind in the past 30 days, and is based in an
entertainment establishment registered at the local Social Hygiene Clinic (SHC).
FFSW: Born female, 15 years and older, who had sex in exchange of cash or payment in kind in the past 30 days, and is based in
cruising sites such as streets or entertainment establishments not registered at the local SHC.

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IHBSS Inclusion Criteria:
RFSW: Born female, 15 years and older, who had sex in exchange of cash or payment in kind in the past 30 days, and is based in an entertainment establishment registered at the local Social Hygiene Clinic (SHC).
FFSW: Born female, 15 years and older, who had sex in exchange of cash or payment in kind in the past 30 days, and is based in cruising sites such as streets or entertainment establishments not registered at the local SHC.
MSM: Born male, 15 years and older, who had sex, anal or oral, with another male in the past 12 months.
IDU: Male or female, 15 years and older, who injected drugs not prescribed by a physician, in the past 6 months.

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IHBSS Inclusion Criteria:
RFSW: Born female, 15 years and older, who had sex in exchange of cash or payment in kind in the past 30 days, and is based in an entertainment establishment registered at the local Social Hygiene Clinic (SHC).
FFSW: Born female, 15 years and older, who had sex in exchange of cash or payment in kind in the past 30 days, and is based in cruising sites such as streets or entertainment establishments not registered at the local SHC.
MSM: Born male, 15 years and older, who had sex, anal or oral, with another male in the past 12 months.
IDU: Male or female, 15 years and older, who injected drugs not prescribed by a physician, in the past 6 months.

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The IHBSS. The first systematic attempt of the Department of Health (DOH) to track HIV/AIDS in the Philippines was through the HIV/AIDS Registry established in 1987. This was followed by the HIV Serologic Surveillance (HSS) in 1993 and subsequently by the Behavioral Sentinel Surveillance (BSS) in 1997. These surveillance systems aimed to unearth information needed to address the prevailing HIV infection.

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