Outside in the yard without any chance to get other people sick? Not really a big deal. It can actually be helpful in a lot of cases to get some sun and fresh air while sick.
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Outside the house at the store, library, playgroups, school, parties? NO! Not only is the kid likely miserable, doesn't want to be out anyhow, and has a weaker immune system and can contract other illnesses, but the choice to bring a sick kid out in public can mean that an immune compromised child or adult is severely injured or killed as a result of contracting the illness. (Or, any child can get sick, causing other families potential financial hardship, work problems, school issues, etc.)
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So, outside the house or in a situation where the child won't infect others or won't be infected with something worse, not a big deal as long as the child is up for it.