Although vaccinations are given to children and sometimes adults on a regular schedule, the immunity does not last for a lifetime as originally perceived. Vaccinations usually only protect against diseases for roughly 8 years after the vaccine has been administered.
Antibody levels naturally fall over the years, plus individual immunity levels will vary from individual to individual
by vaccination
hepatitis B immune globulin 2 months ago and MMR vaccine given today
Booster vaccinations are given to stimulate the immune response and allow an animal or person to have continued immunity without having to go through the whole vaccination process again.
If a person is infected with Hepatitis B, the vaccine will have no effect. The vaccine contains proteins from the virus, and these are already present in the person's body, and the immune system has already responded to them.
Acquired immunity can be gained by the use of vaccinations either from your primary care giver or your local health department. Passive immunity can be acquired from exposure to someone who has the disease, in which case the person can often develop a light case of the disease, which would cause one's body to develop antibodies against the disease, thus achieving the same effects as the vaccination.
having the actual disease
The act or practice of inoculating someone with a vaccine as a protection against disease is called a vaccination. This is used to build immunity to specific diseases that could be detrimental to society and to the person who is not vaccinated.
When you are inoculated for MMR, your body develops antibodies to Measles, Mumps and Rubella. The antibodies help you resist those diseases.
The response to infections is active or cellular immunity. Acquired immunity
Passive immunity is different from active immunity because it means that you can get it from another person and you can give it someone else. Active immunity is when you get it by yourself, not from another person, and you cannot pass it to another person.
Naturally acquired immunity occurs through contact with a disease causing agent, when the contact was not deliberate, whereas artificially acquired immunity develops only through deliberate actions such as vaccination. they are both immunitys
HBsAg non-reactive does NOT mean immune to hepatitis B. To understand this we have to discuss what exactly HBsAg is. The hepatitis B virus has several components. It is an encapsulated virus, meaning that its central DNA core is protected by an outer shell. This shell is sometimes called the "surface". On this surface are some antigens, which are simply proteins that induce an immune response in the body. We abbreviate these antigens as HBsAg, which is shorthand for "hepatitis B surface antigen". If a blood test reveals that there are no detectable hepatitis B surface antigens, this simply means that the individual has no evidence of being currently infected with hepatitis B. Otherwise, there would be some hepatitis B surface antigens (with hepatitis B DNA inside them) floating around in the bloodstream. To determine if a person is immune to hepatitis B, we must draw a different test. This test checks for the presence of antibodies to the hepatitis B surface antigens. Sometimes this is abbreviated as HBAb, or as Hepatitis B IgG. If the patient has antibodies to Hepatitis B surface antigens, and has no detectable HBsAg in their bloodstream, then it is likely that they are immune. But be careful! Simply having Hepatitis B surface antibodies does not indicate immunity! It may mean that the person is actually infected with Hep B. This is why both tests are necessary to document immunity.