SC Testing Data & Projections (COVID-19)

Thursday, July 9, 2020, 2:00 pm 
This page will be updated regularly as information becomes available. 


DHEC's Public Health Laboratory receives samples from healthcare providers to be tested for COVID-19. The U.S. Food and Drug Administration (FDA) has approved some private labs to also conduct testing for COVID-19. These labs are required to report positive tests for the virus in South Carolina residents to DHEC. Numerical, graphic and mapping summaries regarding testing and the number of observed and projected cases in South Carolina are shown below. Additional details concerning the distribution of cases can be found on the pages showing cases by county & ZIP code and demographic data.




COVID-19 Testing 07.08.2020



COVID-19 cases, by day by the date symptoms first were reported

This chart shows case counts according to dates of illness onset – when patients began having disease symptoms -- rather than according to the subsequent dates when positive laboratory reports were submitted to DHEC.

Cases with a known illness onset date are shown in blue. If that date is not known, the date the person’s sample was collected for testing is used instead and is shown in gray. The green box represents daily case counts that are expected to change because additional data for those cases are currently being collected and reviewed. These data are thus provisional and subject to change.

The data below is updated every Tuesday and Friday afternoon.

COVID-19 Illness Onset 07.07.2020



Positive Cases Indicated by Heat Map

The 14-day Heat Map displays the most recent reported cases during the past 14-day period and estimates where the current burden is due to recently reported cases.

COVID-19 14-Day Rolling Heat Map June 25 - July 9, 2020


The heat map indicates reported cases of COVID-19 in the state. Regardless of the number of reported cases within an area, all South Carolinians should take seriously the recommended precautions for protecting against this disease. The cumulative Heat Map shows all historic reported cases of COVID-19.

COVID-19 Rolling Heat Map - July 9, 2020


Percent Positive Trends Among Reported COVID-19 Cases

Last updated July 9, 2020

The percent positive graphs show trends in the percent of cases of COVID-19 relative to the number of tests performed during the last 28 and 14 days, respectively. The percent positive is the number of individual people that tested positive (1,723 as of July 8) divided by the number of individuals tested (8,350 as of July 8) by both DHEC’s laboratory and private laboratories, then multiplied by 100 (20.6% for July 8).

When the percent positive is high, it may indicate that there isn't enough testing being performed to capture how much disease is in the community and testing may be focused on people who are more severely ill.

When the percent positive is low, it may indicate that more widespread testing is being performed and the percent positive may more accurately reflect how much disease is present in the community.


COVID-19 Percent Positive 14-Day Molecular 07.09.2020


COVID-19 Percent Positive 28-Day Molecular 07.09.2020


Summary of COVID-19 Case Reports through July 4 and Projections through July 25

Last updated July 6, 2020

Table 1 presents numbers of COVID-19 cases observed in the ‘Sunday through Saturday’ weeks since March 1 as well as projections of COVID-19 cases through to the week of July 19 – July 25. 

For each week, data are presented regarding the number of new cases, the overall number of cases up to that time, the case rate per 100,000 persons up to that point, and an indication regarding whether the numbers were observed (i.e. confirmed cases reported to DHEC) or have been projected.

Table 1 Observed and Projected SC COVID-19 Cases by Week: March 1 to July 25

COVID19 - Projections Table 01 - 07.06.2020


Table 2 below provides additional perspectives regarding the projected case rate of 1,250 per 100,000 in SC on July 25, by comparing it to case rates already observed as of July 4 in those states that have suffered the greatest burden of COVID-19.

Table 2 Comparing South Carolina’s Projected COVID-19 Case Rate per 100,000 to Rates Already Observed as of July 4 by Selected Severely Impacted States

COVID19 - Projections Table 02 - 07.06.2020

Additional Notes and Explanations

  1. DHEC reports laboratory-confirmed cases so that the number of positive tests reported for a particular day is considered to be the number of new cases for that day. However, laboratories are not always able to process and test the samples they receive on the same day they get them. This can relate to the time of day when some samples reach them, and occasionally also to temporary shortages of chemicals needed to perform the tests.
  2. Regarding table 2 it is also important to note that uncertainties exist regarding projections made for the coming weeks. For example, since not all persons who are infected are tested, the number of officially reported cases is not identical to the actual number of cases in the population.
  3. The modeling and projections shown below come from the Institute for Health Metrics and Evaluation (IHME), which offers one of the most commonly used models. Predictions made by different models may typically differ as each may depend on slightly different assumptions and use of data. Though the predictions regarding future weeks and months do not match perfectly, they generally provide helpful perspectives regarding the future course of the pandemic.

COVID-19 projections assuming full social distancing through May 2020





Career of Service Community Survey COVID-19