origin, infection, invasion, diseases, disease, life, cause, activity, action, dissociation, theory, flora, infections, growth, nature, agents, poisons, toxins, virulence, species, causes, influence, products, agent, population, decomposition, etiology, plaques, contamination, affections, forms, invasions, content, respiration, attack, toxines, associations, cyanosis, elements, poison, influences, inflammation, metabolism, parasites, enemies, invaders, association, organisms, digestion, plaque, tests, heredity, destruction, emboli, cultures, affection, factor, vegetable, composition, maladies, causation, intoxication, variation, element, germs, populations, serum, embolism, permeability, fermentation, agency, intoxications, nations, fever, ferments, irritation, inoculation, cell, death, attacks, superinfection, putrefaction, worlds, drugs, contents, selection, intervention, injury, present