Any of four criteria designed to establish a causative relationship between a microbe and a disease: (i) the microorganism must be found in abundance in all organisms suffering from the disease, but should not be found in healthy organisms; (ii) it must be isolated from a diseased organism and grown in pure culture; (iii) the cultured microorganism should cause disease when introduced into a healthy organism; (iv) the microorganism must be reisolated from the inoculated, diseased experimental host and identified as being identical to the original specific causative agent.

plural of poster boy

plural of postal vote

(philately, advertising) A label, resembling a postage stamp, issued to advertise or commemorate a product or event.

plural of poster stamp

(psychology) Postpartum depression.

simple past tense and past participle of postaccelerate

plural of answer on a postcard

plural of postal forgery

plural of postcode lottery