A, ANIMAL, ARTHROPOD, BACILLUS, BACTERIAL, BACTERIOLOGY, BACTERIUM, BSIP, BUBONIC, CAUSES, CHEOPIS, ELECTRON, ELECTRONIC, ELEKTRONICZNA, ELEKTRONICZNE, ELEKTRONICZNY, ENTEROBACTERIACEAE, ENTEROBACTERIALES, ENTEROBACTERIUM, FLEA, IMAGERY, INFECTION, INSECT, INSEKT, KONCZYNY, LEK, LEKARSTWO, MEDICINE, MEDYCYNA, MICROBIOLOGY, MICROGRAPH, MICROORGANISM, MICROSCOPE, MIKROBIOLOGIA, MIKROSKOP, NIAID, OF, ON, ORGANISM, OWAD, PARASITE, PCHLA, PESTIS, PLAGA, PLAGUE, PROTEOBACTERIA, PROVENTRICULAR, PULICID, RESULT, ROBAK, SCANNING, SCIENTIFIC, SEM, SIPHONAPTER, SPINES, UNICELLULAR, WHICH, XENOPSYLLA, YERSIN, YERSINIA, YERSINIOSIS, ZAKAZENIE, ZWIERZE, ZWIERZECY,