2: Mean number of colony-forming units
of bacteria per cubic meter of air from samples obtained at various distances from the edge of fields with grazing sheep, Imperial Valley, 2011.
5 colony-forming units
at baseline (range, 1-247), the median colony-forming units
dropped to 4 (range, 0-60) after the stethoscopes were swiped with alcohol hand rub.
When 24 of the stethoscopes were wiped with an alcohol pad as part of the study, the median number of colony-forming units
plummeted to 0, with a range of 0-59.
Specimens were defined as contaminated if the total bacterial colony counts were at least 5,000 colony-forming units
subtilis preparations permitted colony recovery in 60% of tests and reduced colony-forming units
500-fold, and exposure to either vacuum or phosphotungstic acid-negative stain alone had little effect on the viability of adenovirus, poliovirus, or spore preparations (33).
monocytogenes to below the detection level (lower than 100 colony-forming units
per gram) immediately after it was applied.
The geometric means for airborne fungi were low and ranged from 42 to 110 colony-forming units
per cubic meter (CFU/[m.
Adding 20 to 30 parts per million of chlorine dioxide to chiller water in the laboratory test reduced bacterial counts from initial levels of 12,000 to 14,000 colony-forming units
per milliliter to less than 10 cfu/ml, in only 3 to 5 minutes.
In addition to lower CLABSI rates, researchers also reported on the density of the colony-forming units
in blood samples, as another way to compare the disinfection cap to the manual, alcohol pad method of connector disinfection.
Three hundred thirty-six healthy Mexican children (aged 6 months to 3 years) attending day-care centers were randomly assigned to receive, in double-blind fashion, Lactobacillus reuteri DSM 179 38 (108 colony-forming units
per day) or placebo for 3 months, and were then followed for an additional 3 months.
This seminal study, conducted in collaboration with the Defence Science and Technology Laboratory, Salisbury (DSTL), United Kingdom, researchers reported 100% bacterial identification accuracy at inoculum concentrations as low as 8 colony-forming units
Generally, probiotic doses of more than 5 billion colony-forming units
per day for children and more than 10 billion colony-forming units
per day for adults were associated with the best outcomes.
The daily drink, which contained 50 billion colony-forming units
of live Lactobacillus acidophilus and L.
An average of almost one serving per person a year contains at least 1 million colony-forming units
per gram, considered a high level of the pathogen.
Total mean bacterial counts and mean anaerobic bacterial counts were calculated for all specimens, and the surgical field was judged to be "contaminated" if bacterial colony counts were found to be greater than or equal to 5,000 colony-forming units
at any given time interval.