The 3 Ds:
Distance: The further away you are from someone who is infected, the less likely you are to be infected by them or to breathe in particles they have breathed out.
Dose: To become infected you need to have contact with a minimum dose, which takes time and exposure to people with the virus. The longer you are exposed to an infectious person, the more people you are exposed to, and the fewer barriers (like cloth masks) between you, the more likely you are to be exposed to the virus. People who have symptoms or are about to develop symptoms, including mild illness, are generally more infectious – i.e., are able to produce larger doses of infected respiratory particles.
Dispersion: Because smaller particles hang around in the air, the movement of air makes a really big difference. The particles disperse quickly if you are outside, particularly if there is a breeze or wind. We also know that sunlight breaks down the virus. Small, enclosed spaces with closed windows are high risk, especially when they are crowded.
The three Ds interact!
Do everything possible Outdoors
Keep at least one metre Distance (two metres is better) from people
Avoid Crowded spaces
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Source: The Daily Maverick "Advice for the Public" (accessed 30 June 2020)