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Ahead of the Curve: How the COVID-19 Pandemic May Unfold

Ahead of the Curve: How the COVID-19 Pandemic May Unfold

Jun 09, 2020

Because the situation surrounding COVID-19 is constantly evolving, some information may not be up to date. Stay informed by following information from your local officials and by visiting the CDC website.

There is a glimmer of hope as experts look toward the future and the end of the COVID-19 pandemic. A vaccine is in the works, new treatment options are in clinical trial, and we’re learning more about the virus every day. So let’s take a look at the possible scenarios of how the pandemic may play out over the next couple of years.

Three Possible Trajectories for the COVID-19 Pandemic

Using data from past flu pandemics and studying the behavior of this and similar viruses, researchers at the Center for Infectious Disease Research and Policy at the University of Minnesota mapped out three possible journeys for this pandemic.

First Possible Trajectories

The first scenario involves a series of consistent peaks and valleys. The second predicts a seasonal peak of cases, similar to what occurred about a century ago with the Spanish flu. The third depicts a sharp peak of cases early on with a series of smaller ups and downs as cases decline.

Keep in mind: There is no one-size-fits-all projection that we can apply across every state in America. We also have to consider the different features and climates of each area, as well as the protocol that’s in place to slow the spread.

So let’s dive deeper into what would happen if certain controls were in place.

Taking Key Factors Into Account

The Center for Communicable Disease Dynamics at the Harvard T.H. Chan School of Public Health mapped out how certain factors may affect the spread of COVID-19.

Every county has implemented various measures to flatten the curve, the purpose of which is to avoid overwhelming hospitals. These initiatives include social distancing, establishing stay-at-home orders, wearing masks, contact tracing, etc.

Once cases begin to decline over a period of time, leaders can loosen restrictions until cases begin to rise toward a threshold dependent upon hospital capacity. With social distancing interventions, it would look a little something like this:

Social Distancing A

The green bars represent when social distancing guidelines are in place. As the number of cases fluctuates, these guidelines are implemented and removed with the ebb and flow.

But what if the changing seasons have an effect on COVID-19, demonstrated in Scenario 2 above? We might witness a minimal decline in spread during warmer months and an increase during colder months, slightly changing the trajectory to something like this:

Social Distancing B

What if a community were able to double the critical-care capacity of local hospitals with additional resources? Leaders could lift restrictions for longer periods of time, leading to more pronounced ups and downs:

Social Distancing C

But wait! There’s another factor to consider.

Developing Community Immunity

Studies suggest that when someone overcomes COVID-19, they develop a level of immunity to the virus. This means it’s unlikely for people who have had the virus to contract it again. As the local population gradually develops herd immunity, we can better contain the spread of the virus throughout the community. Safely building herd immunity without a vaccine requires a controlled increase in social interaction.

In these particular models, the herd immunity threshold is 55% of the population. In other words, 55% of the community would need to develop immunity in order for the virus to stop spreading without other controls, like social distancing, in place.

Here’s what herd immunity may look like for each of the above projections.

Last Herd Immunity

No matter how the pandemic unfolds, CHI St. Joseph Health is here to provide the care you need. Having established the highest safety protocols, our clinics and hospitals are open for in-person appointments so you can keep your health on track. For minor injury and illness, you can schedule a televisit with a CHI St. Joseph and Texas A&M Health Network physician.

Sources:
AAAS | Projecting the transmission dynamics of SARS-CoV-2 through the postpandemic period
CIDRAP | COVID-19: The CIDRAP Viewpoint

New York Times | This Is the Future of the Pandemic