ARTWORK, ATTACKING, BACTERIA, BACTERIAL, BACTERIOLOGICAL, BACTERIOLOGY, BACTERIUM, BIOLOGICAL, BIOLOGY, CELL, GOMBERT, HUMAN, ILLUSTRATION, INFECTING, INFECTION, MICRO-ORGANISM, MICROBE, MICROBIOLOGICAL, MICROBIOLOGY, MICROORGANISM, NO-ONE, NOBODY, PARTICLES, SIGRID, VIRAL, VIRION, VIRIONS, VIROLOGICAL, VIROLOGY, VIRUS,