Reduction in COVID-19 Infection Using Surgical Facial Masks Outside the Healthcare System

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

6000 participants

Study Classification

INTERVENTIONAL

Study Start Date

2020-04-02

Study Completion Date

2020-06-02

Brief Summary

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In the current COVID-19 pandemic with coronavirus, SARS-COV2, the Danish Health Authorities recommend using facial masks in the health care system when handling patients presumed or proven to be infected with the virus. However, the use of facial masks outside the health care system is not recommended by the Danish Health Authorities. Here, Health Authorities in other countries have different recommendations for the use of facial masks.

Challenges when using facial masks outside the health care system include wearing the mask consistently, an efficacy of the mask of app. 8 hours necessitating a change of mask throughout the day, and that it is not sufficiently tight enough to safely keep the virus out. Moreover, the eyes (mucous membrane) remain exposed. Compliance could also be another challenge.

SARS-COV2 is assumed to primarily enter the body via the mouth through respiratory droplets - or possibly through inhalation of aerosol containing the virus. From the mouth the virus is assumed to spread to the airways and the gastro-intestinal tract. SARS-COV2 is also known to be transmitted via physical contact, helped along by the fact that the virus can survive on surfaces for at least 72 hours. Touching such a contaminated surface can transfer the virus to the mouth via the hand - and thus lead to infection of the person.

Facial masks are expected to protect against viral infection in two ways;

1. By reducing the risk of getting the virus in via the mouth or nose via respiratory droplets or aerosol
2. By reducing the transfer from virus-contaminated hands to the mouth or nose

Hypothesis The use of surgical facial masks outside the hospital will reduce the frequency of COVID-19 infection.

All participants will follow authority recommendations and be randomized to either wear facial masks or not. The participants will be screened for antibodies at study start and study end. They will perform swab-test if they experience symptoms during the study as well as the end of study.

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Detailed Description

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Background In the current COVID-19 pandemic with coronavirus, SARS-COV2, the Danish Health Authorities recommend using facial masks in the health care sector when handling patients presumed or proven to be infected with the virus. However, the use of facial masks outside the healthcare system is not recommended by the Danish Health Authorities. Challenges when using facial masks outside the health care system include wearing the mask consistently, an efficacy of the mask of app. 8 hours necessitating a change of mask throughout the day, and that it is not sufficiently tight enough to safely keep the virus out. Moreover, the eyes (mucous membrane) remain exposed. Compliance could also be another challenge. Health Authorities in other countries have different recommendations for the use of facial masks and the authors of the Lancet study concluded; "Universal use of face masks could be considered if supplies permit. In parallel, urgent research on the duration of protection of face masks, the measures to prolong life of disposable masks, and the invention on reusable masks should be encouraged."

SARS-COV2 is assumed to primarily enter the body via the mouth through respiratory droplets or possibly through inhalation of aerosol containing the virus. From the mouth the virus is assumed to spread to the airways and the gastro-intestinal tract. SARS-COV2 is also known to be transmitted via physical contact, helped along by the fact that the virus can survive on surfaces for at least 72 hours. Touching such a contaminated surface can transfer the virus to the mouth via the hand - and thus lead to infection of the person. A study with 26 medical students showed that they touched their face on average 23 times per hour, and that in 44 % of the incidents they touched their mucous membranes3. A Japanese questionnaire study showed that facial masks reduced the risk for school children for getting influenza by 15 %4. N95 mask and surgical facial masks are presumed to have the same effect for healthcare personnel when providing protecting from infection with influenza.

Facial masks are assumed to protect against viral infection in two ways;

1. By reducing the risk of getting the virus via mouth or nose through the air via respiratory droplets or aerosol
2. By reducing the transfer from virus-contaminated hands to the mouth or nose

About 10 % of the Danish population is estimated to get COVID-19 during the present pandemic-wave; this corresponds to 600,000 Danes. Later COVID-19 waves are expected to occur. The epidemic in Denmark is expected to be at the highest point in medio April. In April and May it be estimated that \>2 % of the population will be infected per month.

Hypothesis The use of surgical facial masks outside the hospital will reduce the frequency of COVID-19 infection.

Method The participants recruited are people working outside of their home, who have not previously been infected with COVID-19 and who do not wear facial masks (e.g. healthcare personnel) when working. They will be randomized for

1. Normal behavior according to the authority's recommendations or
2. Normal behavior according to the authority's recommendations and use of facial masks

Participants will be instructed in using the facial mask consistently when outside their home (and at home when receiving visits from others. The instruction is given in writing and via an instruction video. The participants will be contacted once weekly to optimize compliance. It will be registered if the participants are diagnosed with COVID-19. Participants, who are not tested positive for COVID-19 in the study period will perform a self-test if having symptoms or when the study ends (instruction video).

Perspective The study can determine whether use of facial masks in the public is beneficial and if there is an effect this could have great impact on the current as well as any future, similar epidemics.

Interested participants can register through a link in the add to our research registration database RedCap. The participant will then receive written information and can then register. They will receive a COVID-19 screening test set and (+/-) facial masks ( 2 per day) for the first month. If the participant experience symptoms, he/she will register their symptoms in RedCap, test with a swab-test and send the swab-test to the study investigator for analyses. If negative, new test-sets are sent out - if positive, the participant will be referred to the hospital. This process continues until the participant is tested positive for COVID-19, the pandemic is considered finished by the Danish authorities or when the study ends on May 7 2020. At study end, all participants perform antibody screening and swab test, and send it to the study investigators.

Power calculation With an infection frequency of 2 % in the study period, an expected reduction of the risk to 1 % should be demonstratable with a power of 80 % and a p-value of 5 %, if including a total of 4,636 patients randomized 1:1. If the infection frequency is higher the power of the study will be higher. With an expected defection of 20 % a total of 6,000 participants will be included.

Authority approvals from The Danish National Committee On Health Research Ethics and The Data Protection Agency have been granted.

A detailed study analyses plan (SAP) will be finalized before data are analyzed.

Central registry data will be collected later when made available by national health authorities.

Conditions

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COVID-19

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

The participants recruited are people working outside of their home, who have not previously been infected with COVID-19 and who do not wear facial masks (e.g. healthcare personnel) when working. They will be randomized for

1. Normal behavior according to the authority's recommendations or
2. Normal behavior according to the authority's recommendations and use of facial masks

Participants will be instructed in using the facial mask consistently when outside their home (and at home when receiving visits from others. The instruction is given in writing and via an instruction video. The participants will be contacted once weekly to optimize compliance. It will be registered if the participants are diagnosed with COVID-19. Participants will perform antibody screening at study start and end. Participants, who are not tested positive for COVID-19 in the study period will perform a swab self-test if experiencing symptoms or when the study ends (instruction video).

Primary Study Purpose

PREVENTION

Blinding Strategy

NONE

Study Groups

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Normal recommendations, no mask

Normal behavior according to the authority's recommendations or

Group Type NO_INTERVENTION

No interventions assigned to this group

Normal recommendations AND mask

Normal behavior according to the authority's recommendations AND use of facial masks

Group Type EXPERIMENTAL

Surgical facial mask

Intervention Type OTHER

Participants will follow normal Authority recommendations AND wear mask outside their homes, or when receiving visits in their home.

Interventions

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Surgical facial mask

Participants will follow normal Authority recommendations AND wear mask outside their homes, or when receiving visits in their home.

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Older than 18 years of age and without symptoms associated with corona-virus (or previously tested positive for corona).
* Participant is outside their home more than 3 hours a day. E.g.for work or for other activities among other people.
* Do not normally wear a facial mask for daily work (e.g. healthcare personnel)