handwriting text cross contamination. word for unintentional transmission of bacteria from one substance to another man

food raw contamination meat disease illness poultry healthy fresh contaminated danger safety health unhealthy bacteria spoiled hygiene control manufacturing allergen salmonella bacterium area polluted material substance process particles germs unhygienic harmful toxic infection environment preservatives additives detrimental chemicals hazardous specimen healthcare unclean indecent contagion poisoning pollution