That Centers for Disease Control and Prevention has changed its policy and is now advising everyone, whether they have symptoms of COVID-19, to cover their faces with masks or cloth whenever social distance is difficult to maintain. For more details, the CDC does not say you have to wear a mask wherever you go, but in places where people gather, including grocery stores and public transportation and rides.
The shift in recommendations reflects growing evidence that COVID-19 can be transmitted through breathing and normal speech but also the fact that people do not effectively cover their sneezing and coughing.
The middle name COVID-19 must be “hidden”. People can lose virus for one to three days before showing any symptoms – including no coughing, sneezing, or fever – in what is called “presymptomatic transmission.” A Singapore study shows that 10% of infections are caused by asymptomatic spread.
A study of 3,711 passengers and crew on board Putri Intan cruises show that almost 1 in 5 COVID-19 operators have never experienced symptoms. Some of these people transmit the virus through “asymptomatic transmission.” The proportion of infected people who have never experienced symptoms can be more like one third for the general population who are younger and healthier than those used to cruise ships.
The ability of viruses to spread easily from one person to another is why people are asked to physically distance themselves from each other. But people still have to go to get important items in places where people gather.
If someone doesn’t cough or sneeze, how do they spread the virus? One of them is by contact. This virus lives in the mucous membranes in the throat and nose. With everyone touching their faces two and a half minutes, on average it is easy to see how the virus spreads to our hands, and then we can spread it to commonly used surfaces such as doorknobs, plastic handles on subways or other people’s hands. Steel and plastic the surface can hold a living virus for three days.
Another method of transmission is with infected people without symptoms breathing, talks, shouted or song. This activity aerosolize virus, creating virus particles in the air – also called droplet nuclei – that are so small that they can float in the air to three hours. Coughing and sneezing produce bigger water and viruses dropletand produce aerosol virus.
General medical devices, such as nebulizer machines for asthmatics and CPAP machines for those who suffer from sleep apnea, can aerosolize the virus. But the concentration of the aerosol virus will be small in a large ventilated room and practically does not exist outdoors. Aerosol viruses that infect become more alarming in places such as small rooms that are poorly ventilated. Places like patient bedrooms in their homes, several nursing home rooms and classrooms will all come to my attention as doctor. Hospital rooms generally have better ventilation.
The main determinant of being infected is the amount of time you are exposed – so your risk is much smaller with five minutes versus 30 or more minutes of exposure. People think about the dangers of radiation exposure in the same way – how close you are to the source, the concentration of exposure and the amount of time you are exposed.
DIY and surgical masks can protect you and others
The purpose of all of us wearing facial masks or surgical masks wherever people gather is first and foremost to protect others if we sneeze or cough. This lid will stop many large droplets that can reach people as far as 18 feet. Just published research indicate that surgical mask can also reduce the amount of aerosol viruses that people produce by breathing and talking.
A big question is: Is this DIY or surgical mask also protect the wearer? Same research study indicating these masks inhibit the aerosol virus released by the user so that maybe they can reduce viral respiration too. But they are not easy. This mask does not fit the face, so the aerosol virus and larger droplets can be sucked through the gap between the face and mask when we inhale.
In addition, some virus particles are so small that they can be inhaled through the cloth or paper used to make this mask. One should not be lulled by the false sense of security in thinking that this type is mask will protect them from the aerosol virus that is carried through the air, especially in poorly ventilated rooms that are often visited by others. The best thing to do is avoid spaces like that or be in them as short as possible.
The chance of catching COVID-19 from someone walking outside the house is very small. Wearing face coverings is recommended and requested when you are indoors, including mass transit and share it with others.
Wherever you go, keep up physical distance a minimum of 6 feet without body contact. If someone nearby sneezes or coughs and they don’t wear masks, get at least 20 feet, fast. When you do an assignment, wear a facepiece and finish your business as fast as possible.
You don’t need an N-95 mask if you wear a face mask when going out in public or take public transportation and practice maintaining a good physical distance. Health care workers must treat their COVID-19 patients in a very close distance for a long period of time. If they don’t have an N-95 mask, the risk rises for them. If you have an N-95 mask, please donate it to the local hospital or first respondent.
The doctor explains why and when to wear a mask according to CDC guidelines (2020, 7 April)
taken April 7, 2020
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