A recent research result shows us a fact that the covid19 virus can stay up alive to 28 days in a recovered person. A study case was studied and investigated by a group of medical researchers that an infected person who got fever and cough from day one and in day fifteen this person was recovered but the virus is not completely cleared out until day twenty eight. We might be misled by the previous oversea study result that the virus can only survive for 14 days. More studies are still on going and the final result may reverse our previous view on this deadly virus.