As part of microbiology laboratory practical, you are given a mixed culture that contains Salmonella spp., E. coli, Enterococcus spp., Staphylococcus aureus and Saccharomyces cerevisiae and other microorganisms. Describe the methods you can use to isolate and identify Salmonella spp., E. coli and Staphylococcus aureus from the mixed culture?
What will be an ideal response?
Answer: There are specific media for E. coli, Salmonella and Staphylococcus. For specifically isolating E. coli, chromogenic E. coli agar can be used (there are many). For isolating Salmonella, Salmonella-Shigella Agar can be used. For isolating Staphyloccus, Mannitol Salt agar can be used.
E. coli is gram negative, small rod shpaed bacteria. Salmonella is gram negative, big rod shpaed bacteria. Staphyloccus is gram positive large rod shpaed bacteria.
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Who promoted the idea that some diseases, especially chronic diseases, have a multifactorial etiology
a. William Farr b. William Farrell c. Thomas Edison d. William Smith