Flu season is starting in many parts of the world now. So, now people are worried about flu and COVID. How worried should people be? What are their risks? I think we shouldn't be worried. We should rather be prepared because for flu, we do have a vaccine, we do have antivirals and a set of measures.

The PCR laboratory is also called the gene amplification laboratory. PCR is the abbreviation for Polymerase Chain Reaction. It is a molecular biology technique used to amplify specific DNA fragments, which can be regarded as a special DNA replication in vitro.