Does a “Healthy Carrier” Really Exist?

The COVID-19 could cause SARS and we have to respond to it to keep ourselves healthy. The infection is serious and therefore we have to keep zero Covid-19 goal to live in a safe and healthy environment without a pandemic. We have to quarantine to stop further spreading of the viruses; however, our quarantine and other responses were also excessive sometimes, the nucleic acid test, which is one of them, always broke our quarantine that could stop the spreading of the viruses and tested out more infected individuals without symptom and that made them be quarantined. The nucleic acid test made more people be infected and be quarantined away from their family. Questions came when thinking how to make the infected healthy and not infectious again so that they could go back to live in our society again, and whether one who recovered health and had no symptom was still infectious, does a “healthy carrier” really exist? Using mathematics, it could be proved that one definitely is not infectious as long as he was healthy and had no symptom, otherwise he must infect himself first and make him have symptoms, and this not true for a “healthy carrier”. Therefore, it definitely is impossible for a healthy individual who had no symptom to be infectious, this is also valid for Mary Mallon who was the first one labelled by “healthy carrier”, the infectious source is the dirty water but not herself. One definitely is not infectious as long as he was healthy and had no symptom, and he would even be less infectious if he recovered health from an infection and had no symptom, because that is same to that he had a vaccination. Nucleic acid test is unnecessary, it can’t definitely show one was infectious and sometimes it causes infection by itself; thence, we must exam whether one was not infectious only by whether he was healthy and had no symptom, but can absolutely not test nucleic acid for a healthy human without symptom.