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 and

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

1.Gloves, nitrile

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.