scratched polio vaccination seal stamp and halftone dotted virus cell

antiserum axenic bacillus bacterium biohazard care cell collage deadbeat dots draft drug grainy grunge grungy halftone icon immunization imprint infection infectious microbe microbiology molecular parallel parasite pixelated points polio poliomyelitis poliovirus protect provocative receptor red replicator scratched seal spore stamp stirrer structure symbol vaccination vaccine vector viral virulent virus