Too much is dependent on the population size and density, wherever an outbreak occurs, and the behaviour of the people in that area.
A remote area may be badly affected, if a large number of people bring it into that area, whereas a densely populated area may not be affected that much, if only one or two people bring it into that area, and the people behave responsibly.
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Chatting in pubs, restaurants and homes was "mostly" how coronavirus spread before Wales' firebreak lockdown, Public Health Wales has said.
Dr Chris Williams, of PHW's data analysing surveillance team, said most cases had nothing to do with venues making mistakes.
The cases were simply down to how people behaved.
"It's not to do particularly with the nature of the pub or the bar," said Dr Williams.
"It's just the fact that you're talking to someone across a table who's in a different household.
"Talking, unfortunately, is great for transmission, as is singing and shouting.
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