The IHR answer is, of course, correct - but some aspects must be expanded upon. Even the dead and dying can document important facts of history. It also shows perfectly healthy, well-fed inmates being filmed after the Allied takeover, washing the naked, still alive typhus victims who had soiled themselves because they were too weak to make it to the toilet. Dr. Butz shows a photo of inmates squatting by the hundreds in a field in Bergen Belsen camp, pants pulled down, all defecating. The camp ground is littered with paper - sheets of paper used by the typhus victims to wipe themselves in those fields.
Body fluids are highly contagious.
Additionally, the camp toilets were, by then, totally plugged up and no longer usable. There were four in one room and four in another. He also found record books listing the food that had been cooked and distributed going back to about 1942. Each of the different hut's larders listed the amount of food that had been sent in the big churns for distribution. This, however, was not a popular view.