Coronavirus is a type of virus that causes common colds, but can also cause more serious diseases such as SARS, MERS, or COVID - 19. The virus is only about 0.025 µm in diameter, far smaller than the human eye can see even with the best optical microscope. In comparison, fine human hair is about 40 µm in diameter. When people talk, cough, or sneeze they eject small droplets which vary greatly in size but the average is about 1 µm. Each small droplet can hold hundreds of thousands of viruses and the droplets can persist in the air for several hours.
This image of a coronavirus taken by an electron microscope shows small structures on the surface which look like crowns. When the virus encounters a human cell, the crown attaches to the cell's surface and injects its RNA into the cell, which then takes over the cellular mechanisms and produces copies of the virus. They eventually cause the cell to burst which can release up to 50,000 new viruses.
COVID-19 Virus is a new virus in humans that entered the population for the first time late in 2019. The virus cannot live long outside a human host, and the main vector for its transmission is those who travel to and from infected areas. We have little natural immunity to the virus and there is no proven treatment or vaccine for the virus. About 97% of the infected recover within 14 days, but in particularly severe cases must be put on a ventilator to keep the patient breathing until the virus runs its course. The virus is most lethal for the elderly and those with compromised immune systems.
The symptoms of the virus are headaches, fever, pink itchy eyes, coughs, sneezes, sore throat, tightness in the chest, difficulty breathing, inflamed toes, and loss of smell or taste. The incubation period after exposure is from 5 to 14 days. People exposed to free COVID test in LA may transmit the virus to others before they experience symptoms. However, some people with the virus may never have symptoms, yet still, be able to transmit the virus to others.
The virus is transmitted by direct contact between individuals from small droplets ejected when an infected person talks, coughs, or sneezes. The social distance of 6 feet is usually enough to prevent the virus from being transmitted directly. However, small droplets from coughs or sneezes may travel much further than 6 feet and may contain hundreds of thousands of viruses. The droplets may persist in the air for several hours. They eventually settle on surfaces where the virus may live for up to several days, depending on the type of surface. For example, the virus is found to exist for a day on cardboard and up to three days on tile or plastic.
The virus infects a person by entering through their eyes, nose, or mouth. It may happen from being near an infected person, particularly if they are coughing or sneezing. Small droplets that settle on surfaces are transferred when you touch the surface and then they may infect you when you touch your face. Once on your hands, you will transfer the virus to everything else you touch until you wash your hands or kill the virus with hand sanitizer.