Together, these findings may suggest that the negativation of PCR in the blood samples may occur before the parasite clearance in the tissues.
Although many housing characteristics were included in the model, other significant factors that we were unable to control for may exist (e.g., different waves of NHANES sampling may occur in different geographic regions).
Short samples may occur if a 'long' job sampling period is subdivided into tasks included in the job [ 9, 12, 21, 40, 64]; and also in cases where a sample is subdivided in shorter sequences, for instance for illustrative purposes (see e.g. Figure 3 in [ 13]).
However, limitations due to experimental design, and limitations in sample throughput, may occur.
In some cases sample breakthrough may occur, especially when the injection is performed into short trapping columns.
In summary, IAH, depending on the sample population, may occur in 20% to 40% of intensive care patients.
And while stable performance is desirable in all applications, it is particularly important for absolute quantification because sample counting may occur some time from the last system calibration.
An insufficient sample collection may occur if the swab is not inserted properly into the rectum, but this should have been rare since sampling was performed by study nurses that had received instruction about the procedure.
Evaluation of factors that might impact microbiota assessment is important to avoid spurious results, particularly in field and multicenter studies where sample collection may occur distant from the laboratory.
However, since histological sections only provide a 2-dimensional sample of the 3-dimensional tissue, sampling errors may occur, leading to underestimating the prevalence of ITDs associated with vessels.
