vaccines contain either live or killed antigen .live vaccines contain attenuated (weakened)viruses which do not have the ability to cause disease.when the vaccine is injected the body produces anti-bodies against it .next time when the virus enters by that time the body has enough anti-bodies to fight the disease causing virus successfully.
When a vaccinated person encounters a pathogen they've been vaccinated against, their immune system recognizes it as a familiar threat due to the memory cells developed during vaccination. This triggers a rapid and targeted immune response, leading to the destruction of the pathogen before it can cause serious illness. This process helps the person stay healthy and recover faster.
Babies are vaccinated to protect against common diseases until their immune systems are developed.
An immune response is part of the body's defense against pathogens in which cells of the immune system react to each kind of pathogen with a defense targeted specifically toward that pathogen.
Yes.
Ideally a person would never contract a disease that he/she has been vaccinated against. The foundation of vaccination is the idea that you expose a person's immune system to the pathogen that causes a disease so that the immune system will recognize it and kill it off quickly if the person is ever exposed again. In reality, some vaccinations just don't work - there are always a few people that don't respond to the vaccine, or that respond weakly and don't have enough memory cells to fight off the pathogen.
When the human body mobilizes its defenses against a pathogen, it recognizes the pathogen by identifying specific molecules on its surface called antigens. The immune system then mounts a response by producing antibodies that target and neutralize the pathogen, as well as activating immune cells to attack and destroy the pathogen. This orchestrated immune response is crucial for fighting off infections and maintaining health.
You get immunity by having a vaccination or by having the infection itself. The vaccination is the introduction of the pathogen in tiny amounts to kick start your immune system so it knows how to deal with the real thing if you encounter the germ in the environment. A vaccine is the medicine made to introduce the pathogen (infection-causing "bug") into your body in a vaccination. Having immunity is how your body prevents a second infection by the same germ. The first time you catch the germ (or get a vaccination for it), your body responds to cause immunity, so if you run across the same exact germ again later, your body already knows how to prevent an infection again. See the related questions below for more about vaccines and vaccinations.
Vaccination is the process of attempting to confer artificial immunity on an individual organism by exposing the immune system to antigens of the pathogen being vaccinated against. Vaccination does not provide nearly as good protection as natural, or acquired immunity.
True
Active immunity occurs when the immune system is exposed to a pathogen and responds by producing specific antibodies against it. This can happen naturally, through infection, or artificially, through vaccination. In both cases, the body "remembers" the pathogen, allowing for a quicker and more effective response if re-exposed in the future. This process helps provide long-term protection against diseases.
Active acquired immunity occurs when you get an infection by a pathogen (bacteria, virus) and your body responds and removes the pathogen and also your body makes "memory" cells. These cell remember this pathogen and when it enters your body again you remove it immediately. You are now immune to it. You usually don't notice this.
An allergic reaction i believe.