Can You Get COVID-19 Twice? The Science Says

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Lee Health

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Mar 31, 2021

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Florida - Southwest

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As we move further into the COVID-19 pandemic, one question seems to be on everyone's mind: Can you get COVID-19 twice?
Like with so many other questions we have about COVID-19, the answer isnt clear.
Here is the CDC's latest information on the question:
"Cases of reinfectionof COVID-19 have been reported but are rare. In general, reinfection means a person was infected (got sick) once, recovered, and then later became infected again. Based on what we know from similar viruses, some reinfections are expected."
Antibodies: What Do They Mean?
The body's immune system fights infections by producing antibodies to viruses, and some experts think that those who recover from COVID-19 developantibodies that may offer protection against reinfection.
But how strong that immune response is and for how long it lasts remains unknown.
Top infectious disease experts assert that immunity to other known coronaviruses, including those that cause the common cold, typically lasts only 3-6 months.
The Hong Kong reinfection study, slated for publication in the medical journalClinical Infectious Diseases, details how researchers sequenced the genomes of the virus after both infections for comparison.
Researchers found the second infection appears as a slightly different virus strain from the initial one, thus confirming reinfection, rather than a positive result due to a lingering first infection.
Dont Stress
Nevertheless,Dr. Stephanie Stovall, infection prevention medical director with Lee Health, says we shouldnt stress about the reinfection case.
We see this with other types of coronaviruses, the ones that give us the common cold," Dr. Stovall says. "It is unknown if the genetic differences that were seen will affect immunity.
Its remains unclear how common reinfection from COVID-19 might be because few researchers have sequenced the virus from each infection, Dr. Stovall adds. That's a reminder that COVID-19 is a new disease, caused by a new coronavirus previously unseen in humans.
Long-Term Immunity
On Aug. 24, researchers in Hong Kong confirmed a 33-year-old man was infected a second time with COVID-19 more than four months after his first bout.
The patient was first diagnosed with COVID-19 in March and cleared the virus in April, according to the study.
Dr. Stovall says the patient became re-infected relatively soon (4.5 months) after clearing his first infection, and this suggests that long-term immunity may not be naturally occurring after infection.
For example, people who have had a virus like the measles develop lifelong immunity (along with antibodies) to it, she explains. When were re-exposed to the measles, special white blood cells called B lymphocytes in our immune system start producing antibodies that neutralize the virus and mark it for destruction by other types of white blood cells.
With COVID-19 and common cold viruses like other coronaviruses and rhinoviruses, our bodies may develop detectable antibodies, according to Dr. Stovall. But there is the possibility that these antibodies either dont last long enough or arent strong to prevent reinfection.
This may mean that the conceptof herd immunityis less likely to be effective atcontrolling disease in our communities, Dr. Stovall notes. Ultimately, we need more information from vaccine trials and from the genetic sequencing of the virus in suspected re-infection cases to know more.
Until more evidence-based data become available to bolster the fight against COVID-19, wearing a mask, practicing social distance, and regularly using alcohol-based hand sanitizers remain theanswersthat we can count on.

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