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After your first exposure to a pathogen, you have memory T-cells that will remember the antigen of the pathogen so in the future if you would come in contact with the same pathogen your body would recognize it right away and be able to kill it much faster.
Pathogens are any organisms that can cause disease in humans; this includes a variety of viruses, bacteria, fungi and proteinaceous infectious material (such as prions). By definition, a human becomes infected with a pathogen through exposure and potentially develops disease related to that infection with a pathogen.
Active acquired immunity - Develops following direct exposure to a pathogen • i.e. measles, chicken pox
titer
Risk of exposure is low
Hemoglobin is a normal component of a red blood cell, and is not a pathogen.
Yes, it is called the Bloodborne Pathogen standard.
An individual is exposed to a killed pathogen, an inactivated pathogen, or a component of a pathogen. The individual is protected from subsequent exposures to the pathogen because the adaptive immune system is stimulated to produce memory B cells and memory T cells, which protect from subsequent exposures.
Post-exposure prophylaxis (PEP) is any medical treatment started immediately after exposure to a pathogen especially a virus. For example rabies vaccine is given to humans and animals who been exposed to rabies.. Also tetanus vaccine is given to tetanus exposure. AZT is given for treatment for AIDS exposure.
HIV and HBV
In medicine, the locus where a pathogen can enter would be any part of the body or surface that is moist. This includes the eyes, the nose and the mouth.
Anything that causes disease is considered to be pathogenic. This includes viruses and bacteria. People who come in contact with certain of these organisms may become very ill.