title: An appraisal of survival strategies.
mesh_terms: D000818:Animals; D003001:Cloning, Molecular; D006801:Humans; D010272:Parasitic Diseases / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology