How to use cellulose sponge validations for sample collection, preparation & processing?
Updated: Apr 16, 2021
How to use cellulose sponge covid home sample collection？
These sampling approaches have been organized with the Centers for Disease Control and Prevention (CDC) aid to furnish standardized strategies for industrial hygienists or different educated samplers below the course of sampling experts to use when sampling for Bacillus anthracis (B. anthracis) spores. These tactics supersede preceding CDC strategies for gathering environmental samples for B. anthracis, including Comprehensive Procedures for Collecting Environmental Samples for Culturing Bacillus anthracis, which have been developed at some stage in the 2001 anthrax terrorist events. As mentioned in that guidance, CDC deliberate to replace the practice as new facts will become available. In particular, one accurate exchange is the current efforts by way of CDC to validate techniques for the laboratory processing and evaluation of B. anthracis spores.
These methods are supposed to be used for a series of samples on smooth, non-porous surfaces and can be used in indoor and door environments. Examples of non-porous surfaces are stainless steel, painted wallboard, ground tile, or timber laminate. Each sampling technique has its precise makes use of and advantages. Sampling strategies should be coordinated with the laboratory to ensure that they are equipped to be given and system all the samples. This is, in particular, vital if deviating from the validated sampling procedures.
Swabs are splendid for sampling small surfaces or challenging to attain areas of much less than four inches rectangular (in2), like crevices, corners, provide air diffusers, air return grills, and hard-to-reach places. Wipes are gorgeous for sampling large non-porous surfaces, inclusive of walls, desks, and floors. An interagency effort recognized as the Validated Sampling Plan Working Group (VSPWG) is presently creating a record titled Reference Guide for Developing and Executing Bacillus anthracis Sampling Plans in Indoor Settings, which outlines processes and methodologies to represent and information remediation of indoor websites with possible or proper contamination. The VSPWG document, as soon as published, needs to be consulted for extra statistics about techniques and coaching for sampling B. anthracis. This record will also help interpret outcomes for samples accrued with macrofoam swabs and cellulose sponges on smooth, non-porous surfaces following these series procedures.
Additional data related to Bacillus anthracis sampling, together with hints for defending investigators whilst sampling, are accessible at www.cdc.gov/niosh/topics/anthrax/ and www.cdc.gov/niosh/docs/2009-132/default.html.
The samples related to a crime scene or suspicion of a crook tournament must be coordinated with regulation enforcement authorities. Sampling groups want to be conscious that pieces amassed may additionally be or come to be crook evidence, and sure extra strategies related to pattern series will be necessary.
Cellulose Sponge Procedure
Cellulose Sponge validations for sample collection
2.Ruler, disposable, and overlaying tape
Sample template, disposable, pattern vicinity dimension 100 in2 (645 cm2)
3.Sponge, sterile, pre-moistened with 10 mL neutralizing buffer solution, 1.5 through three inches cellulose sponge folded over a take care of (such as the PUSPONGE Cellulose Sponge-Stick)
Sponge, sterile, dry, 1.5 utilizing three inches cellulose sponge folded over a take care of (such as the PUSPONGE Sponge-Stick[Biocide-free Cellulose Sponge Validations for Sample Collection] )
The general neutralizing buffer that will inactivate halogen disinfectants and quaternary ammonium compounds, sterile, 10 mL (such as the Neutralizing Buffer [Hardy Diagnostics, Santa Maria, California; catalogue wide variety K105] or equivalent)
4.Screw-cap specimen container, sterile, personally wrapped four ounces (such as General Purpose Specimen Container [Kendall Healthcare, Mansfield, Massachusetts; catalogue wide variety 8889-207026] or equivalent)
5.Sample labels or Permanent marker
6.Resealable plastic bag, 1-quart or smaller
7.Resealable plastic bag, 1-gallon or larger
Cellulose Sponge Sampling Procedure
1.Wearing a comfortable pair of gloves over present gloves, vicinity the disposable template over the location to be sampled and impenetrable it. If a template can't be used, measure the sampling place with a disposable ruler, and delineate the area to be tested with overlaying tape. The floor vicinity sampled must be much less than or equal to a hundred in2 (645 cm2).
2.Remove the sterile sponge from its package. Grasp the sponge close to the pinnacle of the handle. Do now not deal with under-the-thumb stop.
3.If the sterile sponge is no longer pre-moistened, moisten the sponge with the aid of pouring the 10 mL container of neutralizing buffer answer over the dry sponge.
Note: The moistened sponge must no longer be dripping neutralizing buffer solution.
Note: Any new neutralizing buffer answer ought to be discarded.
4.Wipe the floor to be sampled the usage of the moistened sterile sponge by way of laying the most comprehensive section of the sponge on the surface, leaving the central part barely lifted. Apply mild, however, company strain and use an overlapping 'S' sample to cowl the whole floor with horizontal strokes.
5.Turn the sponge over and wipe the equal location once more with the use of vertical 'S’-strokes.
Sponge making use of vertical 'S' strokes
6.Use the edges of the sponge (narrow sides) to wipe the exact location the usage of diagonal 'S’-strokes.
7.Use the tip of the sponge to wipe the perimeter of the sampling area.
8.Place the head of the sponge immediately into a sterile specimen container. Break off the head of the sponge with the aid of bending the handle. The give up of the sponge handle, touched with the support of the collector, have to contact the interior of the specimen container no longer. Securely seal and label the box (e.g., particular pattern identifier, pattern location, initials of collector and date and time pattern was once collected).
9.Place the pattern container in a resealable 1-quart plastic bag. Securely seal and label the load (e.g., pattern location, date and time pattern used to be collected, and identify of person accumulating the sample). Specimen containers and resealable luggage might also be pre-labelled to aid with sampling efficiency.
Note: Remove immoderate air from the resealable plastic baggage to enlarge the wide variety of samples that can be shipped in one container.
10.Dispose of the template if used.
11.Remove outer gloves and discard. Clean gloves have to be worn for every new sample.
Field blanks are samples treated precisely the identical as these used to gather area samples, without they are now not allowed to come into contact with the contaminated surface. It is used to estimate illness bobbing up from guidance for sampling, sampler technique, and cargo and storage prior to analysis. The number of subject blanks amassed must be equal to at least 10% of the samples collected. Field blanks must be accrued whilst in the contaminated area. While carrying smooth (sterile gloves for managing gauze), the macrofoam swab, cellulose sponge, or gauze must be eliminated from its packaging, moistened (as needed, see sections 3.1, 3.2 and 3.3), and then positioned in the fantastic container (either a centrifuge tube or specimen container). An aliquot of the unused element of the opened neutralizing buffer answer has to additionally be amassed when the usage of a macrofoam swab, cellulose sponge, or gauze media that are no longer pre-moistened.
Media blanks are unexposed samples used for history correction of pattern readings or for recuperation studies. Provide two unopened pattern media (macrofoam swab, cellulose sponge, or gauze) per lot used and grant two unopened, unused samples of the neutralizing buffer answer (if no longer the usage of pre-moistened media) as media blanks to the processing laboratory.
Sample Bag Decontamination
Place multiples of the resealable 1-quart plastic luggage into a 1-gallon resealable plastic bag. Securely seal the 1-gallon resealable plastic bag and label the bag (e.g., pick out samples contained in the resealable plastic bag, pattern locations, date and time samples had been collected, and identify of person amassing the samples).
Decontaminate the outer floor of the large resealable plastic bag with the use of a clean pH-adjusted bleach answer (household bleach diluted 1:9; pH-adjusted to 6.8-8.0) with a 10-minute contact time earlier than the resealable plastic bag leaves the contaminated area. This answer can be organized by:
Step 1: Mixing one section family bleach (5.25 to 6.0 p.c sodium hypochlorite) with 5 components water (v/v);
Step 2: Adding 1 section of white vinegar; and
Step 3: Adding three components of extra water.
Note: Additional records about decontamination is reachable at
Thoroughly dry the backyard of the resealable plastic bag.
Complete a chain of custody form.
Note: Once the outer resealable plastic bag is decontaminated, it has to be no longer opened outdoor of terrific containment in a laboratory.
Place the large resealable plastic bag into a suitable container for delivery (See Sample Shipment section).
Decontamination of Bags Containing Documentation
Place pattern sheets and additional documentation in a separate resealable plastic bag. The sheets have to be positioned two to a bag with the face of every sheet going throughout. Securely seal and label the bag (e.g., corresponding pattern locations, date and time samples have been collected, and title of person accumulating the samples).
Note: It is essential to solely write on one aspect of the paper, the face when gathering information.
Decontaminate the outer floor of the large resealable plastic bag the usage of a sparkling pH-adjusted bleach answer (household bleach diluted 1:9; pH-adjusted to 6.8-8.0) with a 10-minute contact time earlier than the resealable plastic bag leaves the contaminated area. This answer can be organized by:
Step 1: Mixing one phase family bleach (5.25 to 6.0 p.c sodium hypochlorite) with five components water (v/v);
Step 2: Adding 1 phase white vinegar; and
Step 3: Adding three components of extra water.
Note: Additional facts about decontamination is reachable at www.epa.gov/opp00001/factsheets/chemicals/bleachfactsheet.htm
Thoroughly dry the outdoor of the resealable plastic bag.
Complete a chain of custody form.
Note: Once the outer resealable plastic bag is decontaminated, it needs to be now not opened backyard of fabulous containment.
Place the large resealable plastic bag into a gorgeous container for shipping.
Transport all samples to the processing laboratory on moist ice or on bloodless packs.
Note: Samples may additionally be saved at 2°C–8°C prior to processing and need to be processed within forty-eight hours of collection.
An appropriate chain of custody types and analytical request types have to be protected with every cargo despatched to the processing laboratory. Containers used to transport the samples and accompanying contaminated documentation and tools need to be organized and shipped in accordance with the excellent rules for transporting infectious. The most contemporary Code of Federal Regulations, International Air Transport Association guidelines, and different gorgeous regulators or education publications need to be consulted for competing instructions. The shipper is accountable for making sure adherence to the most current and fantastic regulations.
Note: Do now not transport contaminated equipment/supplies in the equal container as the samples.