As cases of coronavirus infection increases rapidly in number around the world and the governments take extraordinary measures to limit the spread, there is still a lot of confusion about what exactly the virus does to people’s bodies. The symptoms- fever, cough, shortness of breath- can signal any number of illnesses,from flu to strep to the common cold. Here is what medical experts and researchers have learned so far about the progression of the infection caused by this new coronavirus. The virus is spread through droplets transmitted into the air from coughing or sneezing,which people nearby can take in through their nose,mouth or eyes. The viral particles in these droplets travel quickly to the back of your nasal passages and to the mucous membranes in the back of your throat, attaching to a particular receptor in cells,beginning there. Coronovirus particles have spiked proteins sticking out from their surfaces,and these spikes hook onto cell membranes, allowing the virus’s genetic material to enter the human cell. The genetic material proceeds to hijack the metabolism of the cell. As copies of the virus multiply,they burst out and infect neighbouring cells. The symptoms often start in the back of the throat and a dry cough. The virus then crawls progressively down the bronchial tubes. When the virus reaches the lungs, their mucous membrane become inflamed. That can damage the alveoli or lung sacs and they have to work hardertocarry out their function of supplying oxygen to the blood that circulates throughout our body and removing carbondioxide from the blood so that it can be exaled. The swelling and the impaired flow of oxygen can cause those areas in the lungs to fill with fluid, pus and dead cells. Pneumonia, an infection in the lung can occur. Some people have somuch trouble breathing they need to put in the ventilator. In the worst cases, known as Acute Respiratory Distress Syndrome, the lungs fill with so much fluid that no amount of breathing support can help, and the patient dies.