Swabs used for virus sampling are to be in direct contact with the sampling site, the material of the sampling head and subsequent testing is closely related, the material requirements of virus sampling swabs will be very high.
Virus sampling swab head should be made of polyester (PE) synthetic fiber or artificial fiber, shall not use calcium alginate sponge or wooden rod swab (including the bamboo stick rod of), and the head of the swab can not use cotton wrapped around the rod, because cotton fiber has a strong protein adsorption capacity, so it is not easy to be eluted to the subsequent preservation solution; and contains calcium alginate and wood components immersed in the preservation solution will also absorb proteins and even inhibit the subsequent PCR reaction.
So what material should be used so that the swab is not inhibited?
We can use synthetic fibers for the swab head, such as PE fibers, polyester fibers and polypropylene fibers.
Calcium alginate sponges are banned as sampling swab material!
In addition, there are two types of swab rods, fracture type and built-in type.
The general fracture type swab can be placed directly into the virus preservation solution after sampling, break the swab at the fracture opening and discard the tail, tighten the cap and send it for testing in a timely manner. This type of swab is also more common.
Built-in swab is the tube cover and swab is connected to a piece, directly after sampling the swab into the sampling tube tightened, this does not need to break the swab directly after the sample can be sent directly to the test, this swab is generally used for dry collection.
Sampling swab and virus sampling tube is required to ensure the amount of sampling and release, and the quality of sampling swab and virus sampling tube can directly affect the results of subsequent testing, so must not use materials that have an impact on subsequent testing, especially calcium alginate and wooden bamboo and other materials.
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