Mass vaccination and available antiviral treatments have not prevented vaccinated individuals from experiencing lingering COVID-19 symptoms.
A recent study found that the majority of patients who suffered from long COVID during a time when vaccines and antiviral treatments were widely available were vaccinated. The observational study published in the Journal of Clinical Medicine, researchers interviewed 390 people in Thailand who contracted COVID-19 during the “fifth wave of the COVID-19 pandemic” when the omicron variant was dominant. Patients were followed by phone from three months after their diagnosis for a year to monitor their physical condition, mental health, sleep disturbances, and quality of life.
Out of 390 people with COVID-19, 377 (97 percent) were vaccinated, 383 (98 percent) underwent antiviral treatment, and 330 (78 percent) developed long COVID syndrome. The most frequently reported symptoms were fatigue and cough. Other reported symptoms included depression, anxiety, and poor sleep quality. The study found that patients under age 60 with a cough as an initial symptom were more likely to develop the condition. In a subset of patients with long COVID, researchers found a notable correlation in females with headaches, dizziness, and brain fog.
“Despite the extensive distribution of vaccines and antiviral therapies, the prevalence of long COVID remains high,” the authors of the paper wrote.
Although definitions of long COVID differ, the Centers for Disease Control and Prevention (CDC) broadly defines long COVID as “signs, symptoms, and conditions that continue to develop after acute COVID-19 infection” that can last for “weeks, months, or years.” The term “long COVID” also includes post-acute sequelae of SARS-CoV-2 infection, long-haul COVID, and post-acute COVID-19.
According to the World Health Organization, while most people with COVID-19 recover and return to normal health, some patients, including those with mild illness, have symptoms that persist for weeks or months after recovering from acute illness.
Nearly 7 percent of U.S. adults surveyed by the CDC in 2022 said they’ve experienced long COVID. Although U.S. regulatory agencies claim vaccinating against COVID-19 can reduce the risk of developing long COVID, the current paper did not find a significant link between the presence of comorbidities or infection severity and the emergence of long COVID symptoms.
