Mouth protection / Face masks

There are a several questions about face masks in connection to Covid-19. On this page we will try to answer these questions and explain why we in Science Forum Covid-19 recommend the use of face masks.

Question: Why should I wear a face mask if I feel well?

Answer: You can infect others even if you have no symptoms..

Asymptomatic Transmission #1
This study from New England Journal of Medicine shows how the transmission of Covid-19 differs from transmission of influenza. An important finding is that more than half of the residents in a nursing home, 27 people out of 48, who tested positive for Covid-19 had no symptoms at all at the time the testing took place.
Asymptomatic Transmission, the Achilles’ Heel of Current Strategies to Control Covid-19

Asymptomatic Transmission #2
This research article, published in The Lancet says that since the incubation period for Covid-19 is about 5-6 days, people can be contagious before they show symptoms.
How will country-based mitigation measures influence the course of the COVID-19 epidemic?

Asymptomatic Transmission #3
A research article published in Nature Medicine shows that infected individuals shed most virus from their upper raspatory tract at the beginning of an infection, i.e. even before the infected person has any symptoms.
Temporal dynamics in viral shedding and transmissibility of COVID-19



Asymptomatic Transmission #4
A study published in the International Journal of Infectious Diseases estimates how common it is for humans to transmit coronavirus without showing symptoms.
Estimation of the asymptomatic ratio of novel coronavirus infections (COVID-19)


Question: Why not just get infected with the virus and become immune?

Answer: It is uncertain whether you become immune, and if you get immune it’s uncertain how long an immunity may last.

Immunity and covid-19 #1
This study from Nature Medicine indicates that people who have had coronavirus may not become immune or that immunity may not last.
Clinical and immunological assessment of asymptomatic SARS-CoV-2 infections


Immunity and covid-19 #2
A large study conducted in Spain indicates that people may not become immune or that immunity disappears after a few months. The study was published in The Lancet.
Prevalence of SARS-CoV-2 in Spain (ENE-COVID): a nationwide, population-based seroepidemiological study

Question: Can Covid-19 be dangerous for me if I am young and healthy?

Answer: Yes, there are many examples of long-term health problems after a Covid-19 infection, even in previously healthy people.

Long-term damage after Covid-19 #1
This study in the scientific journal Radiology documents lung damage that has occurred in previously healthy individuals after Covid-19 infection.
Temporal Changes of CT Findings in 90 Patients with COVID-19 Pneumonia: A Longitudinal Study

Long-term damage after Covid-19 #2
This study from The Lancet documents lung and organ damage caused by Covid-19 in previously completely healthy individuals.
Immune mechanisms of pulmonary intravascular coagulopathy in COVID-19 pneumonia

Long-term damage after Covid-19 #3
A study published in the i Neurology documents permanent brain damage in Covid-19 patients.
Neurochemical evidence of astrocytic and neuronal injury commonly found in COVID-19

Long-term damage after Covid-19 #4
A study in the New England Journal of Medicine documents neurological damage that has occurred in patients with severe Covid-19 infections.
Neurologic Features in Severe SARS-CoV-2 Infection

Long-term damage after Covid-19 #5
The journal Brain has examined the different types of brain damage that have occurred in Covid-19 patients.
The emerging spectrum of COVID-19 neurology: clinical, radiological and laboratory findings

Question: Is it not the case that people become more careless if they use masks, and ignore keeping distance?

Answer: No, on the contrary, there are studies showing that people who use mouth protection become more careful.

Mouth protection/face mask makes people more careful
An article with this theme was published in the British Medical Journal.
Is risk compensation threatening public health in the covid-19 pandemic?

Question: Where can I find face mask recommendations and what do they base their recommendations on?

Answer: There are more and more recommendations for using face masks. We have listed some of them.

These recommend mouth protection #1
Many experts around the world, including a virologist who has received the Nobel Prize, recommend masks.
Tygmasker kan hjälpa till att stoppa spridningen av COVID-19, rädda jobb och återställa jobb.

These recommend mouth protection #2
The Royal Swedish Academy of Sciences recommends mouth protection.
Vetenskapsakademien sammanfattar kunskapsläget. Experter inom mikrobiologi och medicin förklarar coronaviruset, sjukdomen och pandemin.

These recommend mouth protection #3
The World Health Organization, WHO, recommends mouth protection.
The #WearAMask Challenge

Does mouth protection work?
The members of Science Forum Covid-19 have collected a solid scientific basis that shows the effect of mouth protection.
Extensive documentation on the effect of mouth protection sent to the Public Health Agency.

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