MUSC COVID-19 Epidemiology Intelligence Project

COVID-19 Status Summary for the Charleston metropolitan area (Charleston, Berkeley, and Dorchester Counties)

View information for the Florence area (Florence, Marion, Darlington, and Williamsburg Counties)

View information for the Lancaster metropolitan area (Lancaster and Chester Counties)

Updated 5/14/2021 | About This Project    

Click here for a description of Methods and Metrics:

Click here for an Estimate of the Percentage of the population with Immunity Statewide:


COVID-19 Variants: Based on Genetic Sequencing of All Positive COVID-19 Tests MUSC Conducts – Red and Yellow are Variants of Concern

Click here for the latest information on Covid-19 Variants of Interest:

MUSC COVID-19 Situation Assessment:  

Click here for a description of Methods and Metrics:

Metric Status as of May 12th
Weekly Change of Reported COVID-19 Infections
GREEN: -25%

Trajectory of documented cases (Increasing or Decreasing)

 Number of Reported
COVID-19 cases in last week
RED: 484 new cases reported last 7 days
(May 4th –May 10th)


Diagnostic Testing Availability
Return of Diagnostic Test Results
Hospital Capacity to treat Critical Patients
Super spreader events and congregant facility outbreaks
RED:(Multiple Nursing Home Outbreaks Reported by DHEC)

Key Findings:

Key Findings are based on results from Wednesday, May 5th- Tuesday, May 11th, 2021.

The risk to those without immunity from vaccination or a recent infection (past 5-months) is currently extremely high. Vaccination is the most potent and durable way to protect yourself from COVID-19. The region has experienced a significant decline in the number daily of COVID-19 cases per 100,000 people – but this includes a large proportion of people with immunity from vaccination and recent infection. Almost no infections are occurring among people who are fully vaccinated or had a recent infection. As a result, the standard metric of cases per day per 100k population is declining as fewer people are at risk. However, the risk to those who have not been vaccinated or had a recent infection is currently high as virtually all new infections are occurring in the shrinking group of those without immunity. Risk is very low for those with immunity, but extremely high for those without vaccination or a recent infection. Vaccination is likely to provide stronger and longer lasting immunity than from an infection, so those who have had a prior infection should still get vaccinated.

This week the 7-day average of new infections decreased by 45% over the past week. It is important to recognize that the overall level of new infections each week is still high for those without immunity from vaccination or a recent infection. It is critically important that those without immunity from vaccination or a recent infection to maintain sustained vigilance in practicing behavioral prevention such as wearing masks, keeping a distance from others, avoiding indoor gatherings, and good hand hygiene.

 The current number of infections diagnosed each day for every 100,000 people (7-day rolling average) is 8.6. One week ago, this value was 15.6.   

 There were a moderate number of infections diagnosed this week with 484 cases in the past week. In the prior week there were 874 cases diagnosed.     

 There are an estimated 1,358 active infections diagnosed by lab testing. These people can infect other people. This is down slightly from 1,737 in the last week. It is estimated that approximately 5 times the number of diagnosed cases go undiagnosed, yielding over 8,000 active cases in our area combining diagnosed and undiagnosed.

Most undiagnosed people who are infected will not be aware they carry the virus and can infect others. The time between becoming infected and having symptoms averages 5-days, and this is a period when a person is typically highly infectious. The risk of infection from people with no symptoms, or mild symptoms, is the greatest single threat to members of the community. Do not assume that a lack of symptoms in people you encounter means that they cannot transmit the COVID-19 virus to you.

 Across large areas of the United States there was a significant surge in COVID-19 cases over and after the winter holiday period, and this has subsided in most areas. Over the past 2-weeks there has been a sustained decline in cases in the US. Michigan has had a recent large surge of cases, which is now slowing declining. This week surges in multiple counties of Oregon have also occurred. Numerous variants of the virus that have been detected throughout the US are now more than 50% of cases, and many of these are known to be more easily transmitted than the initial version of the virus. This is raising serious concerns over new surges in infections in the coming months.

The community is advised to develop an evidence-based risk mitigation plan. It is ill-advised to take more risks because of vaccines being approved, or because of lower rates of COVID-19 in the community or your immediate social network. There are a substantial number of infectious people in the community and rapid spread can occur before it is detected.  

After vaccination it is important to continue to practice prevention practices. There are two well-known features of the vaccines for COVID-19:

  1. They are not instantaneously effective.
  2.  One dose does not provide protection sufficient to allow immunized individuals to consider themselves immune from COVID, even after two weeks have elapsed.
If you have symptoms of COVID-19 after getting immunized, it is still very possible that you acquired COVID-19, and you should self-isolate and immediately seek tested. If you have had your first vaccine dose, make sure to get your second one scheduled. Going forward it is also important to continue wear a mask and avoid inside contact with others. Scientists are still assessing if those vaccinated can get a mild infection and transmit the virus to others. It is likely that in the months ahead information on this will be determined. In the meantime, continue to practice the standard prevention behaviors.

Scientific evidence is strong for the effectiveness of several risk mitigation behaviors:

  1. Wear a mask when around others, and avoid neck gaiters and vented masks.
  2. Keep a distance of no-less than 6-feet from others, more is better.
  3. Avoid crowds.
  4. Wash hands frequently.
  5. Favor gathering with people outside over inside, and open windows (even a few inches helps) when feasible with others while inside.
  6. Wear a mask and crack windows when you must travel with others in a vehicle. 

 There is strong evidence that transmission of the virus that causes COVID-19 is occurring via aerosols. Aerosols are very small liquid particles that are breathed out when people speak, and they can float in the air like smoke for hours. Loud talking, singing, and heavy breathing from exercise generate a significant volume of aerosol particles. As a result, indoor gatherings are risky, especially when turnover of the air is infrequent. Aerosol transmission can occur at much greater distances than 6-feet. People should assume that there is no safe distance from others indoors in poorly ventilated rooms. Multiple high-quality studies have identified indoor visits to restaurants and bars as one of the most common modes of infection.  

 There are are currently few delays in getting appointments for COVID-19 diagnostic testing, and results are being returned quickly. An exception is prior to holidays. If you plan to be tested prior to holidays be aware that delays in getting appointments and return of results may occur.  

Area hospitals are currently well capacitated to manage the case load of COVID-19 admissions.   

COVID-19 Projections for South Carolina

Modeling from the Institute for Health Metrics and Evaluation (IHME) shows projections for South Carolina.

COVID-19 Projections for the MUSC University Hospital

We are in the process of developing a hospital impact model, that will provide analysis of patients seeking care at MUSC University Hospital over time for the current stage of the pandemic. Results will be updated as soon as they are available.