strain – n. a group of closely related living things that look similar but possess one or more unique characteristics

mutation – n. a change in a gene or the resulting new trait it produces in an individual

spiky – adj. having sharp points : formed into points

antibody – n. medical : a substance produced by the body to fight disease

distribution – n. the act of giving or delivering something to people

genetic code – n. the arrangement of chemical groups within the genes which specify particular kinds of amino acids used to make proteins

response –n. an answer or reaction to something

immune –adj. to not be affected by disease