What is Innate immune system?
The '''innate [[immune system]]''' defends the host from [[infection]]s. It includes [[cells]] which recognize and respond to [[pathogen]]s (germs) right away. The innate immune system response is not specific: it responds the same way to all pathogens that it recognises. Unlike the [[adaptive immune system]], the innate immune system does not give long-lasting immunity against specific infections.<ref name=Alberts>{{cite book |last= Alberts |first= Bruce & others |title= Molecular biology of the cell. 4th ed |publisher= Garland Science |year= 2002 |location= New York and London |url= https://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowTOC&rid=mboc4.TOC&depth=2 |isbn= 978-0-8153-3218-3 |archiveurl= https://www.webcitation.org/5IDSbXuy2?url=http://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowTOC |archivedate= 2006-08-17 |url-status= live |access-date= 2017-08-31 }}</ref> Innate immune systems rapidly defend against infections in all plant and [[animal]] life.<ref name=innate/> The innate system is the evolutionarily older defense strategy. It is the main immune system found in [[plant]]s, [[fungi]], [[insect]]s, and in primitive [[multicellular organisms]].<ref name=innate>Janeway, Charles A. 2001. Evolution of the innate immune system. In Janeway, Charles; Paul Travers, Mark Walport, and Mark Shlomchik. ''Immunobiology'', p598. 5th ed, New York and London: Garland Science. {{ISBN|978-0-8153-4101-7}}</ref><ref>{{Citation|last1=Hirano|first1=Masayuki|title=The Evolution of Adaptive Immunity in Vertebrates |date=2011-01-01| url=http://www.sciencedirect.com/science/article/pii/B9780123876645000042 |series=Advances in Immunology|volume=109|pages=125–157|editor-last=Alt|editor-first=Frederick W.|publisher=Academic Press|doi=10.1016/b978-0-12-387664-5.00004-2|pmid=21569914|access-date=2019-12-03| last2=Das|first2=Sabyasachi|last3=Guo|first3=Peng|last4=Cooper|first4=Max D.|isbn=9780123876645}}</ref> The system is not adaptable and does not change over the course of an individual's lifetime. The [[ve