This depends on how deep the hole is dug, for the out house. If it's dug too deep then the contents may seep into the water level and end up in a near by lake.
no
contamination of groundwater
cough
yes
yes
Hiv
Vitamins A and D
Yes
The practice known as universal precautions makes the assumption that those bodily fluids pose a risk for transmission of HIV.
Minimum
possibly because of the chemicals
Aerosolized agents of mass destruction pose a great risk to first responders because they would be airborne when the responders arrive and were exposed to them