COVID-19 spreads from person to person mainly through the respiratory route after the effect
Version: Nov. 21, 2020, 1:14 p.m.
COVID-19 spreads from person to person mainly through the respiratory route after an infected person coughs, sneezes, sings, talks or breathes. A new infection occurs when virus-containing particles exhaled by an infected person, either respiratory droplets or aerosols, get into the mouth, nose, or eyes of other people who are in close contact with the infected person. Respiratory droplets may evaporate into droplet nuclei, which remain suspended in the air for prolonged periods of time. Long distance airborne transmission has been shown to occur in hospital wards. Airborne transmission has been demonstrated in healthcare settings, with certain aerosol-generating medical procedures performed on COVID-19 patients, and regularly occurs in crowded and inadequately ventilated indoor spaces, such as restaurants, nightclubs or choirs. Kissing, physical intimacy, and other forms of direct contact can easily transmit the virus and thus lead to COVID-19 in people exposed to such contact. A person can get COVID-19 through indirect contact by touching a contaminated surface or object before touching their own mouth, nose, or eyes, though this is not thought to be the main way the virus spreads. There is currently no significant evidence of COVID-19 virus transmission through feces, urine, breast milk, food, wastewater, drinking water, animal disease vectors, or from mother to baby during pregnancy, although research is ongoing and caution is advised. The number of people generally infected by one infected person varies; as of September 2020 it was estimated that one infected person will, on average, infect between two and three other people. This is more infectious than influenza, but less so than measles. It often spreads in clusters, where infections can be traced back to an index case or geographical location. There is a major role of "super-spreading events", where many people are infected by one person. It can be transmitted as early as two days before developing symptoms, and even if symptoms never appear. People remain infectious in moderate cases for 7–12 days, and up to two weeks in severe cases. In October 2020, medical scientists reported evidence of reinfection in one patient.
Similarity algorithms were unable to identify any manuscripts that were similar to this manuscript.