What does the term 'memory' of the Immune system mean ?
What does the term 'memory' of the Immune system mean ?
When body encounters a pathogen for the first time produce a response called Primary response.
Primary response is of low intensity.
- Memory cells are formed due to this primary response.
- These cells are stored in spllen and lymph nodes.
When body encounters the same pathogen subsequently then body elicits secondary response.
Secondary response is of high intensity.
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Humans have acquired immune system that produces antibodies to neutralize pathogens. Still innate immune system is present at the time of birth because it
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- [NEET 2019]
What is the basic principle of vaccination ? How do vaccines prevent microbial infections ? Name the organism from which hepatitis $B$ Vaccine is produced.
What is the basic principle of vaccination ? How do vaccines prevent microbial infections ? Name the organism from which hepatitis $B$ Vaccine is produced.