Biology Topic 4.1.1 Key Words Crossword

a microoraganism that causes disease
passing a pathogen from a host to new host, directly
passing a pathogen from host to new host, via a vector
an organism that carries a pathogen from one host to another
a large polysaccharide deposit that blocks old phloem sieve tubes
those that prevent pathogens entering the body
hormone-like molecules used in cell signalling to stimulate the immune response
signalling molecules that are used to communicate between different white blood cells
an increase in the number of cells by mitotic cell division
antibodies that cause pathogens to stick together
antibodies that render toxins harmless
antibodies that make it easier for phagocytes to engulf the pathogen
where the immune system is activated and manufactures its own antibodies
immunity that is achieved as a result of medical intervention
a rapid spread of disease through a high proportion of the population
immunity acheived through normal life processes
immunity acheived when antibodies are passed to the individual through breast feeding or injection
a way of stimulating an immune response so that immunity is acheived
a chemical which prevents growth of microorganisms
a balloon-like swelling or projection that fills the xylem vessel