“The teal line shows the data from 2018 and 2019 (historical) for comparison to the current (2020) data. Lines showing +1 standard deviation (yellow line) and +2 standard deviations (maroon line) for the 2018 and 2019 data are also shown for comparison. If the black line showing the 2020 data rises above the yellow and maroon lines, it is possible that this indicates that community spread of COVID-19 is occurring.”
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