The Reuters blurb below didn't say if any
blood is drawn and/or used in the ceremony.

Or, if they get circumcised.

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Chief John Mashlangu (L), from Kwandebele location, addresses Ndebele
youths who took part in an initiation ceremony marking their transition
from childhood to adulthood in Mpumalanga, 200km (124 miles) northeast
of Johannesburg, South Africa 7/27/06. After two months of seclusion,
150 new initiates went back to their homes to assume responsibility
in the community. This ceremony takes place after every four years.
REUTERS/Antony Kaminju (SOUTH AFRICA) 7/27/06

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I wonder if the tribe has access to ARVs?