The mechanism of lengthy COVID is unknown to us. “No one knows how or why it happens,” said Dr. Haran, clinical director of the Center for Microbiome Research and associate professor of emergency medicine and microbiology and physiological systems.
“There’s a possibility that COVID is overstimulating the innate immune system.
“It’s unclear why, but the immune system appears to be active even after SARS-CoV-2 has cleared.
A Link Is There Between Long-Term Covid Symptoms
We discovered a strong biological signal linking changes in the oral microbiome to long-term COVID symptoms. This shows that the microbiota may have a role in extended COVID and is a mechanism that warrants further investigation.
“Patients with long-term COVID symptoms had oral microbiomes with a considerably higher number of bacteria that cause inflammation, according to research by John P. Haran, MD, Ph.D., and Evan S. Bradley, MD, Ph.D., of UMass Chan Medical School.

Long-term covid symptoms are seen in many patients who had severe covid. A group of experts tries to go for another method that can help the patient to recover quicker than the routine line of treatment offered by different experts in different hospitals. They have identified a link between the oral microbiome and symptoms of Covid-19.
These data reveal a link between the oral microbiota and long COVID, which could point to oral microbiome dysfunction as a cause of long COVID. The oral microbiome, like the microbiomes found in the gut and on the skin, is a collection of bacteria that can influence health and disease progression.
The oral microbiome is much smaller than the gut microbiome, with only a few hundred bacterium species. It is the first point of contact between the immune system and the outside world along the alimentary canal, the channel through which food flows from the mouth to the body.
Maintaining the delicate balance of the oral microbiota is thought to be beneficial to one’s health. Inflammation, sickness, and disease can all be caused by an imbalance in the oral microbiota. Oral microbiome imbalances have been linked to chronic gum disease and can potentially affect the health of the gut microbiota.
“Every day, we live in balance with the microbiome in our mouths,” Haran said. “It is kept working smoothly by the innate immune system. Disrupting this equilibrium can have an impact on the innate immune system, as well as health and disease.
The microbiome of patients with long-term COVID symptoms transforms to a strongly pro-inflammatory condition.”It’s unclear what the variations in the microbiota of long COVID patients reflect, according to study co-author Dr. Bradley, an assistant professor of emergency medicine.
“We believe that an individual’s oral microbiome determines how their immune system responds to COVID and that a pro-inflammatory microbiome could contribute to long-term effects even after the virus has been eradicated.
It’s also likely that COVID causes a shift in the microbiome toward a pro-inflammatory profile in some people, resulting in long-term symptoms.”Chronic inflammation has also been linked to this syndrome as a cause of these individuals’ symptoms.
“We don’t know why there’s a link between the oral microbiome, inflammation, and lengthy COVID,” Haran added. “This link has to be investigated further in order to better understand, prevent, and treat long-term COVID. For that, we’ll need a larger, longer-term study with more participants and data.”
Haran and Bradley used whole-genome sequencing and powerful algorithms to figure out what bacteria were in the oral microbiome of people who had been sick for a long time.
There were 19 bacteria species found in abundance in those patients with persistent symptomatic COVID-19 that did not show in other patients, out of hundreds identified.