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To fight COVID-19, The sooner test, the better prevention. Open Ag/Ab rapid test may pollute Environment and Doctors. Sealing tube test strip combines sampling and test strip in one locking tube to create a "sample=test" model. It could lock active virus in the tube by a unique safe solution in the world.

Sensitivity is a key to find infection, But frequency of Ag/Ab rapid test is also important. Its self test/home use could be of great help to frontline medical workers and isolating persons. But the speed and volume of buffer sampling to test card will affect the signal. Sealing tube test strip has fixed volume buffer inside and its vertical migration assure stable signal even operated by un standard operation of non-trained person.

At the tight moment we need to avoid confusing signal. The open test card only gives right signal at its window time such as 15 minutes. But it may change to weak positive signal on a negative sample when time goes longer. Sealing tube test strip offers quite lasting signal in hours and days to let it later checked by persons with better eyesight. It could be of much help to lots of old persons.