blattella germanica, german cockroach, unhygienic
petri, dish, bacteria
bacteria, bacterium, neisseria meningitidis
virus, bacteria, coronavirus
coronavirus, covid-19, quarantine
hands, soap, to wash
windmill, couple, bubble
intestines, gut, flora
virus, bacteria, coronavirus
coronavirus, disease, virus
coronavirus, co, virus
virus, corona, covid-19
bacteria, disease, escherichia coli
