Vaginal Secretions techniquely do not protect the body from disease. For example, STD, women still get them. However it does protect the body from infections. The secretion is very acidic and kills most infections.
It lives in Blood, Semen, and Vaginal Secretions.
if you mean in bodily functions then; blood, urine and vaginal secretions
No. For instance, HIV can be spread by blood, semen, vaginal secretions, and breast milk.
Antigens do not protect the body from disease. Antibodies protect the body from many diseases.
Body fluids that can transmit HIV include blood, semen, vaginal secretions, breastmilk, cerebrospinal fluid, and synovial fluid. Saliva and urine are not infectious for HIV.
The same way anyone else can get it...through open body to body contact with fliuds such as blood, semen, vaginal secretions and breast milk.
Immunity
Antibodies
If you knew what a disease was, you'd know that they are things that harm or kill people. Then you'd know why the body needs to protect against them.
Immune system protects the body from any type of foreign antigen or pathogen which can cause disease. It also protect from particles to cause disease in human body.
A vaccines helps because they put some of the disease in your body then your body can get use to it so if you get that disease your body can easily fight it out of you!
Active vaccination produces antibodies against the particular organism. These antibodies kill the invading pathogen and protect the body against the disease.