Viral hemorrhagic fever from ebola, marburg, lassa, hantavirus, dengue, yellow fever, west. This principle is true for hepatitis b: hepatitis b"s reservoir: It is found in blood, and therefore also in bloody body fluids. It is also found in semen and vaginal secretions: modes of transmission include percutaneous, mucosal contact, and vertical transmission. It can also be directly transmitted from a pregnant mother to her child. What makes it particularly contagious is that it can survive outside of the human body on. It is 10x more contagious than hcv. surfaces (dried blood) for 7 days and at temperatures of -20 c: transmission has occurred in dialysis units, which is why we try to segregate patients that we know are carriers. This is because healthcare workers can inadvertently contaminate other patients and the environment: globally, there are close to 257 million patients that have been infected. Certain countries have much more than others.