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How to quickly test Covid-19 to be effective and cheaper?

With the previous Omicron and Delta, the dark or light lines on the rapid test strip do not reflect severe or mild disease or will be severe or mild, because viral load does not affect disease severity like the previous variant. .

Test up to 2 lines, whether the T line is dark or light, that is also positive. Right now, worry about isolating, monitoring symptoms, having any symptoms, then treating those symptoms. Because Omicron is mild, people who have had enough of the Covid-19 vaccine will be lighter, and healthy young people will be lighter.

Many people do not suffer from “doing” anything, through Covid-19 like a mild cold but the line is still thick, even “2 lines” more days than people, because when the virus is over, it is because of the body. The only thing that matters is the symptoms. After 7 days, you need to test one more time to end the isolation, then test.

If you say that you are afraid of infecting other people, you want to be absolutely safe. After the full quarantine day, you need to wear the mask carefully for another 7 days. Viruses need time to be eliminated from the body, only 3-4 days to find myself 1 line back, it’s not right to think it’s safe.

Rapid test is less sensitive than PCR, only when PCR is negative or CT>33 is not infectious, but performing PCR is expensive.

Even if it becomes F1, it’s the same. Having just been exposed to F0, the test is of no value, as it takes several days of incubation to become positive for infection. Kids who need test results to go back to school should take the test on the last day before going back to school, and during F1 time, go home to avoid grandparents – which is risky, that’s okay.

A quick test is worthless to know for sure at that point, whether you have enough virus to infect other people or not. Many people have symptoms a few days later, but they are already contagious.

Therefore, the test is not as important as monitoring symptoms, wearing a mask when “in doubt” yourself. During this Omicron “season,” if you have symptoms, you should take the initiative to avoid infecting others.

About worrying about getting sick but not getting tested? Rapid test kits are produced for previous strains, sometimes less effective than this strain and sometimes there are still problems with the quality of the test, the test method…

Therefore, when you see that you have suspicious symptoms but you have had close contact with F0 a few days ago or the entire family of F0 has only 1 line, then consider yourself as F0. A few days will pass, avoid infecting others, no need to panic, but continuous test to find 2 lines.

In addition, to test quickly and effectively, try to test properly during use. There are many tutorials online, easy to find. Pay attention to the stages of reading the results after the test: don’t read too fast, don’t wait hours to get back to reading. Most rapid tests give the most accurate results after 15-20 minutes.


Doctor Truong Huu Khanh (Advisor for Infection Division, Children’s Hospital 1)

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