They are called attenuated vaccines. Attenuated means weakened, they do this usually with chemicals and then the attenuated viruses are not able to make you sick, but they are strong enough to trigger the immune response to provide immunity.
An attenuated virus. Attenuated simply means weakened. For example, you will see references to this in regard to the flu vaccines. This is also abbreviated when talking about the flu vaccines as LAIV, Live Attenuated Influenza Vaccine.
That is a good description of what a vaccine is, although some other substances also could be described similarly. The weakened or killed virus in a vaccine is non-threatening to most people. It can be a problem for infants under six months old, some children and adults with under-developed immune systems or who have immune system disorders.
filter,diatom,bacteriophage,or vaccine
A vaccine typically contains weakened or inactivated disease-causing viruses or bacteria. This formulation allows the immune system to recognize and develop protection against the specific pathogen without causing the full-blown disease.
An attenuated vaccine contains live, weakened microbes. These will multiply at a very low rate in the body but will not cause disease symptoms. This low reproduction rate will allow the body's immune defense to produce an antigen to the pathogen. Because they are live and very close to the natural pathogen, the immunity built from this vaccine generates the strongest immune response.
vaccine
A vaccine usually contains a weakened form of the virus, strong enough to trigger your immune response but weak enough to be defeated by it.
They are called live attenuated vaccines. Attenuated means weakened. The nasal mist flu vaccine is an example of a live attenuated vaccine. The vaccines for flu that are injected are made from pieces of viruses or "dead" viruses. See the related question below for more information on these two types of vaccines.
a vaccine
TB vaccine is a live attenuated vaccine (LAV). This type of vaccine prepared from living micro-organisms (viruses, bacteria currently available) that have been weakened under laboratory conditions.LAV vaccines will replicate in a vaccinated individual and produce an immune response but usually cause a mild or no disease.
vaccine or vaccination
A vaccine.
Live vaccines contains weakened viruses of the disease. These viruses can not cause the disease but give immunity to the recipient. ( In the initial days of such trials, 18 patient got the rabies due to vaccine and died.)
Vaccine