Advantages and collection methods of nasal swabs Advantages of nasal swabs: 1.The nasal swab adopts the spray-type implanted nylon fiber technology, which is first-class in the domestic and foreign...View details
Use skills and introduction of virus sampling tube:
① Virus sampling tube-suitable for collecting and transporting new coronavirus, influenza virus, avian influenza (such as H7N9), hand, foot and mouth virus, measles and other virus specimens, as well as mycoplasma, ureaplasma and chlamydia specimens.
② The virus sampling tube must be transporte within 48 hours under refrigeration (2-8°C).
Long-term storage of viruses and relate samples in -80°C or liquid nitrogen environment.
Sampling method for collecting virus through virus sampling tube:
①. Measure the distance from the tip of the nose to the earlobe with a cotton swab and mark it with your fingers.
②. Insert the sampling cotton swab into the nasal cavity in the direction perpendicular to the nose (face).
③ The distance between the swab should be at least half the length of the earlobe to the tip of the nose.
④. Leave it in the nose for 15-30 seconds, gently rotate it 3-5 times, and then take out the swab.
It is not difficult to see from the method of use that sampling is a technical task,
which is difficult and easy to contaminate.
The quality of all collected samples is directly related to subsequent testing.
Requirements for sampling swabs:
If the viral load of the collected sample is low, it is easy to cause false negatives and difficult to diagnose.
Some sampling swabs have low viral load, improper break points, and the operator is not easy to break.
This not only limits the sampling efficiency, but also It is easy to cause false negatives in nucleic acid testing.
Therefore, the sampling cotton swab head should use synthetic fiber flocking instead of cotton or calcium alginate sponge;
the material of the cotton swab handle is recommend to use hollow polystyrene (PS) extrusion tube or polypropylene (PP) injection molding indentation tube instead of using Wooden sticks or bamboo sticks.
Why can’t we use wooden sticks or bamboo sticks as swab sticks?
Because wooden sticks or bamboo sticks containing calcium alginate are broken and place in the preservation solution, they will absorb protein and even interfere with subsequent tests.
Contraindications of sampling swabs:
① Cotton fiber has strong adsorption power to protein and is not easy to wash.
② The length of the swab should not be too short, and the breaking position should not be too close to the head of the swab,
so as not to contaminate the patient’s body fluids during the operation;
③ The location of the breakpoint should be reasonable,
and the sampling pipe should be broken to avoid contamination caused by the overflowing liquid in the pipe.
④ The virus protection function of the virus sampling tube can keep the virus activity in a lower temperature range.
⑤ Reduce the speed of virus decomposition and increase the positive rate of virus isolation.
Use skills and introduction of virus sampling tube