What does the dark blue color on the map mean?

Areas on the map with a higher prevalence of reported cases per 10,000 residents are shaded darker.  For example, if both Lake Forest and Highland Park have the same number of cases, Lake Forest will display as darker on the map because it has fewer residents, so the prevalence per 10,000 is higher.

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1. How do I use the interactive map?
2. What does the dark blue color on the map mean?
3. Why is there a higher concentration of cases in some areas than others?
4. Why does the map only use ranges of cases (e.g., 5-9 cases) and not exact numbers?
5. Are there cases of COVID-19 in my community?