xylose lysine deoxycholate agar & x28;xld agar& x29; and thiosulphate-citr

agar air aureus background bacteria bacterial bacterium biology biotechnology black blood cell colony color culture danger diagnostic dish fecal food growth health healthcare hygiene isojation isolate lab laboratory media medical medicine medium micro microbe microbiology pathogen pathogens petri plate plates red research risk safety salmonela salmonella science scientific selective shigella streak test treat urine vibrio yellow