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Table 4 Expert and lay model regarding COVID-19 health risk

From: Differences in comprehending and acting on pandemic health risk information: a qualitative study using mental models

NIPH messages

Public perceptions, actions and ways of learning

Virus transmission modes

Relevant transmission modes:

• droplets

• air

• contacts

Variably mentioned:

• droplets

• air

• or/and contact

Also mentioned:

• food

• clothes

• faeces

Dominant transmission route

• Droplet transmission most likely/significant

• Airborne transmission and contact transmission exist but are nonsignificant

• Most did not separate between probable/less probable routes of transmission

• Believed in multiple equal important ways of transmission

Symptomatic, asymptomatic, presymptomatic spread

• Can be infected with and transmit SARS-CoV-2 virus without developing COVID-19

• Can be symptomatic carriers with COVID-19

• People with COVID-19 are most contagious for 1–2 days before the onset of symptoms and in the first days after the onset of symptoms

• Emphasise symptomatic transmission

• Being sick without symptoms not mentioned by most but emphasised as vital to understand why you should keep distance and quarantine

Terminology

• Terminology used on website: contact transmission, droplet transmission, airborne transmission

• Terms not used by most of the participants

• Terms understood differently

• Talked about transmission in relations to behaviours for how transmission occurred:

 • spitting

 • hugging

 • kissing

 • touching

 • talking

Virus survival

• The virus can survive on surfaces from a few hours to several days

• Depends on the amount of virus, temperature, sunlight, and humidity

• The role that virus survival on surfaces plays in causing infection in humans is uncertain and constantly changing

• Poorly ventilated rooms increase the concentration of particles containing the virus

• Acted on evidence from informal sources, e.g., three-day survival on surfaces

• Few mentioned wind, climate and ventilation affected virus spread

• Many wanted more knowledge about how far droplets spread and how long they could survive in the air

Basic infection prevention measures

• Maintain social distancing, have fewer contacts, maintain hand hygiene and cough etiquette and use of face masks when not able to keep a distance

• All were informed about the main mitigation measures

• Some people wanted to understand why certain behaviour and activities were considered high risk, others preferred simple, clear messages explaining what to do and how to protect themselves

• Some sought informal sources to better comprehend the why

• Easily accessible, up-to-date online information

• Need someone to explain and interpret restrictions

• Sometimes enacting mitigation measures was a symbolic action

Safe distance

• The amount of virus exposed at distances of more 1–2 m would rarely be sufficient to cause infection

• Mainly infected within 1–2 m reach from infected person

• Keep one metre of distance

• The greater that the distance that you keep is, the less that the probability is that you will be exposed to infection

• None of the participants talked in terms of probabilities

• One of the participants misunderstood the 1-m rule as a clear boundary between safe and unsafe distances

• Did not understand why 1 m and not 2 m

Risky activities

• Risky activities due to increased expulsion of aerosols and/or being close to others are

 ◦ Pubs

 ◦ Travelling

 ◦ Exercise centres

 ◦ Poorly ventilated rooms

• Increased risk of being physically close to others was well understood

• Struggling to understand why some activities were not allowed

• Some wanted information about risky situations and risky localisations

Protecting others

• The virus is possibly deadly for the oldest and some groups of people with chronic diseases

• All participants understood their collective responsibility to protect others

Contagiousness

• The R-number is how many persons that one corona infected person infects further

• A person infected with the coronavirus infects an average of 2–3 others, while one person with the flu infects 1–2 others

• COVID-19 contagiousness was underestimated by all of the participants

• To comprehend the contagiousness of the virus, they had to understand that this disease was not influenza

Control of the spread

• The R-value was communicated in terms of numbers, but exponential growth was not explained to the public

• The R-number was perceived as a good indicator regarding the control of the spread

• The R-number was often misunderstood

• No one understood exponential growth correctly

Consequences of the pandemic

• NIPH communicated the health effects for the individual

• After one year with pandemic restrictions, most emphasised secondary consequences (e.g., economy, mental health)

• Information about health consequences produced panic in some interviewees and awareness in others

• There were daily trade-offs between social life and the risk of becoming ill