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Nothing that you pass through in those areas will make you sick, so if the issue really is just the bugs going into your mouth, invest in a motorcycle face cloth sheild.
There are ones that look like a skull, others such as pic related, etc. They're not that expensive if you don't get something elaborate.
Would definitely suggest something like pic related in comparison to a bandana, because that can get you in some big trouble in my area, at least. (I live near Los Angeles).