Should you wear a mask? Experts divided on COVID-19 guidelines

The World Health Organization (WHO) has stuck to its general recommendation that healthy people do not need to wear masks to prevent the spread of COVID-19,media New Atlas reported. However, some experts suggest that large-scale wearing of masks may actually help curb the spread of the virus. Some health authorities believe that basic hygiene practices and social isolation are the best strategies to avoid the disease, and that healthy people do not need to wear protective masks.

Should you wear a mask? Experts divided on COVID-19 guidelines

Many parts of the world are suffering from severe shortages of personal protective equipment, which in turn affects the safety of front-line health care workers who really need masks. Therefore, one aspect of supporting the general recommendation is an attempt to avoid the urgent purchase and hoarding of these essential medical supplies.

At a recent press conference, Michael Ryan, executive director of WHO’s Health Emergencies Programme, stressed that the lack of supply of masks was not the main reason why the organization recommended that healthy general public wear masks. Instead, he raised some concerns about abuse. “There is no concrete evidence of the potential benefits of wearing masks in large numbers of people,” Ryan said. “In fact, there is some evidence that the effect of improper use of a mask or improper wearing of a mask may be the opposite. “

In terms of habeas corpus, the WHO’s latest scientific brief on COVID-19 transmission confirms that healthy people wear little protection from masks. The brief note indicates that the latest evidence confirms that the virus is most likely to spread through respiratory droplets and to be in direct contact with infected persons. Viruses can be transmitted through the air, but most of the cases occur in highly specific situations, in which case the virus is emitted in the form of aerosols and then remains in the air for a long time. For example, droplets from coughs are large particles that do not hover in the air but land quickly on the surface of their surroundings.

“In the context of COVID-19, airborne transmission may occur in specific situations and environments, and in specific situations and environments, the procedure or auxiliary treatment for the production of aerosols is carried out; Transfer the patient to a lying position, disconnecting the patient from the ventilator, noninvasive positive pressure ventilation, tracheotomy and CPR. “It is for this particular reason that personal protective equipment, especially the N95 protective mask, should be retained for medical personnel.

Since the likelihood of air-borne aerosols transmitting COVID-19 is small, it is generally recommended that only people with the disease be required to wear protective masks. However, this strategy depends on being able to identify those infected effectively and quickly.

“If I know who (COVID-19) is asymptomatic, then I’ll classify these people,” epidemiologist Arnold Monto told ScienceMag. “We don’t know who these are. “

It is this knowledge gap that has led some experts to advocate for universal wear ingress. Gao Fu, director of The Centers for Disease Control and Prevention, said in a recent interview that the absence of a mask is the biggest mistake in other countries in the world at the moment in controlling the spread of the new coronavirus.

“The biggest mistake in the U.S. and Europe is that people don’t wear masks, ” Mr. Goffsaid said in an interview. “The virus is spread through droplets and close contact. Droplets play a very important role and you have to wear a mask, because when you speak, there are always droplets coming out of your mouth. Many people are asymptomatic or have an incubation period after infection, and if they wear masks, they can be prevented from carrying the virus droplets to others. “

The World Health Organization is right to suggest that masks do not necessarily protect healthy people from the virus. However, the suggestion that people infected with the virus wear masks means that we are currently testing all people infected with COVID-19. A growing body of evidence is beginning to find a large number of asymptomatic cases that may contribute to the widespread spread of the virus.

A major study published in the journal Science in mid-March found that a shocking lying large number of undocumented cases were the cause of the surge in China’s outbreak in January. Based on reported cases from 375 cities in China, computer models were used to simulate the time-to-time spread of the virus, and studies found that confirmed cases could not explain the spread of the virus. In fact, the study concluded that it was important to prove that 86 percent of infections had not been detected to prove widespread spread of the disease in January.

“In China, the explosive growth in COVID-19 cases is mainly caused by individuals with undiscovered mild or asymptomatic conditions,” said study co-author Jeffrey Shaman of Columbia University’s Melman School of Public Health. Depending on their infectious nature and number, undiscovered cases may infect more people with the virus than in other cases. For COVID-19 in China, we found that these undiscovered infections were numerous and contagious. These incognito communications will continue to pose a major challenge to the development of containment of such outbreaks. “

Several smaller, more localized recent studies have begun to confirm that mild or asymptomatic cases may be more pronounced than previously suspected. In the wake of the outbreak, a CDC study tested almost every resident and health care worker at an aged care facility in Washington. About half of the 30 percent of residents who tested positive for the virus were asymptomatic on the day of the test.

Few places in the world have seen a small but associated asymptomatic cases in places with large-scale COVID-19 testing. Large-scale tests in parts of Iceland and Italy have shown a small number of asymptomatic positive cases.

Tom Inglesby, director of the Johns Hopkins Center for Health and Safety, called for widespread use of non-medical masks in the general population to reduce the spread of asymptomatic viruses. Inglesby points out that the widespread use of masks is not personal protection, but slows down the spread of communities because people don’t realize they are contagious.

Should you wear a mask? Experts divided on COVID-19 guidelines

“While there is growing evidence that asymptomatic transmission is fuelling THE spread of COVID, the U.S. Centers for Disease Control and Prevention (CDC) should now recommend that the public use non-medical masks in an attempt to reduce the spread of the virus among asymptomatic people,” he tweeted. “It is vital that all medical masks be handed over to paramedics and first responders – these masks are in serious shortage, so all of these masks must be given to people caring for COVID patients.” But when the public is out in public, another social effort should be taken, namely, to slow the spread of the virus and to wear non-medical masks. “

Inglesby also noted that by far countries with strong mask behavior have been the most rapid in curbing the spread of the virus. Mask cultures are prevalent in places such as South Korea, Hong Kong, Japan, mainland China and Taiwan, and while this is not the only reason for their success in controlling the epidemic, this may be a factor.

Two Yale researchers, Shan Soe-Lin and Robert Hecht, summed up in a recent Boston Globe editorial why they think everyone should wear some kind of face mask when they’re outdoors. Soe-Lin and Hecht are a clear reminder that non-medical masks may not protect someone from infection if they cough directly and close, and that they certainly are not a substitute for hand washing or keeping a social distance. However, a mask can prevent a person from constantly touching his face unconsciously.

They advise: “Cover your face with a mask.” This will prevent you from touching your face from time to time and making yourself aware of how often you touch your nose and mouth. Non-medical masks don’t protect you from direct coughing or sneezing from an infected person, but any type of face protection maximizes your protection from your hands if you keep a good distance from society. “