Fineaerosols Smalldroplets Largedroplets Inhaledvirus Virus in eyes,nose, or mouth Contaminatedsurfaces Virus onhand Breathing Virus onhand Adjust scenario Activity Distance Location Physical contact Surface type Ventilation
Face covering Face covering Visor Perspex screen Visor Surface cleaning Gloves Handhygiene Gloves Hand hygiene Respiratoryhygiene
Visualising expert estimates of covid-19 transmission What might be the best ways of protecting ourselves from covid-19? © 2021 BMJ Publishing Group Ltd. Interactive Disclaimer: This infographic is not a validated clinical decision aid. This information is provided without any representations, conditions, or warranties that it is accurate or up to date. BMJ and its licensors assume no responsibility for any aspect of treatment administered with the aid of this information. Any reliance placed on this information is strictly at the user's own risk. For the full disclaimer wording see BMJ's terms and conditions: http://www.bmj.com/company/legal-information/ Infected person Uninfected person This graphic simulates two people meeting, and what they can do to reduce the risk of catching covid-19. The colours show how much infectious virus is likely to be passed on, based on the best estimates of 26 international experts. Resetgraphic KEY Low High All Split between pathways Quality of evidence 0% 100% 50% Target Source The values above will change depending on the activity selected, which is likely to affect the proportion of droplets of different sizes entering the environment Dependency The values above will change depending on the “physical contact” scenario selected, which is likely to affect the proportion of large droplets landing on different surfaces Dependency The values above will change depending on the “physical contact” scenario selected, which is likely to affect the transfer of virus to other surfaces Dependency Humidity and room temperature may affect the transmission of infectious virus, and every room has its own natural air leakage rates and air flow patterns - affected also by the movement of people and how they are facing each other/how much they are talking etc. There has simply not been enough work on the effects of ventilation on virus transmission to be sure about its effects.And another line... Key uncertainties The blue dot represents the experts’ best estimate of this value. The light blue area shows where they think the value is most likely to be (their 95% confidence interval) Any other coloured areas represent alternative estimates given by some experts The ‘star ratings’ show how strong the experts think the supporting evidence is for these default values: ...confidence that the findings would hold true in reality Closeexplainers Very high... Very low... The position of these dots represent how much we think each of the pathways, precautions, and scenarios would allow the virus to pass through - from 0% (no protection) to 100% (total protection). The default positions were estimated by a group of 26 experts worldwide The precautions you could take to protect yourself from covid-19 affect one or more of the disease ‘pathways’ in the diagram The blue dot represents the experts’ best estimate of this value. The light blue area shows where they think the value is most likely to be (their 95% confidence interval). Any other coloured areas represent other “camps” of opinion that might suggest that one group of experts have a different, and equally plausible, idea of the likely value The ‘star ratings’ show how strong the experts think the supporting evidence is for these default values ...confidence that the findings would hold true in reality Close explainers Very high... Very low... The position of these sliders represent how much we think each of these precautions would affect these disease pathways - from 0 (no protection) to 1 (total protection). The default positions were estimated by a group of experts worldwide - but you can alter these to see ‘what if they are wrong’ > Different scenarios affect the colour of the pathways, increasing or decreasing it at the point it leaves one of the circular “nodes” in the diagram The blue dot represents the experts’ best estimate of this value. The light blue area shows where they think the value is most likely to be (their 95% confidence interval) Any other coloured areas represent other “camps” of opinion that might suggest that one group of experts have a different, and equally plausible, idea of the likely value The ‘star ratings’ show how strong the experts think the supporting evidence is for these default values ...confidence that the findings would hold true in reality Close explainers Very high... Very low... The position of these sliders represent how much we think each of these precautions would affect these disease pathways - from 0 (no protection) to 1 (total protection). The default positions were estimated by a group of experts worldwide - but you can alter these to see ‘what if they are wrong’ This diagram shows the different pathways that can be taken by the virus that causes covid-19 when it transfers between two people. The darker the colour, the higher the estimated risk. Next Skip intro These transmission routes can be affected by factors such as the behaviour of the people, and the environment that they meet in. Next Previous Skip intro There are several measures that can be used to protect ourselves, such as wearing masks or washing hands. These menus will add and remove these measures and show the likely effect on transmission. Begin Previous Skip intro DRAFT

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