Master's degree in Social Work from a CSWE accredited program or a doctorate degree from a school of social work acceptable to the committee. Three thousand hours of supervised clinical experience with a qualified supervisor in no less than 24 months and no more than 48 consecutive months.
Skin Contamination and Blood Cultures. There are really only four bugs that are commonly contaminants when blood cultures are positive: 1  Coag negative staph (gram positive cocci). 2  Corynebacterium (gram positive rods).3  Propionibacterium acnes (anaerobic gram positive rods). 4  Bacillus species (anaerobic gram positive rods).kin Contamination and Blood Cultures. There are really only four bugs that are commonly contaminants when blood cultures are positive: 1  Coag negative staph (gram positive cocci). 2  Corynebacterium (gram positive rods).
For instance, the bacterium Escherichia coli, which causes the majority of urinary tract infections, will appear as pink (gram-negative) rods under the microscope. Lactobacillus, which is a common vaginal contaminant in women's urine samples, will appear as thin purple (gram-positive) rods. Some of the bacteria, such as Lactobacillus, are easy for an experienced laboratorian to identify, are nonpathogenic, and do not require any further investigation.