Global Statistics

All countries
548,935,393
Confirmed
Updated on June 26, 2022 8:18 pm
All countries
520,730,887
Recovered
Updated on June 26, 2022 8:18 pm
All countries
6,350,765
Deaths
Updated on June 26, 2022 8:18 pm
Sunday, August 14, 2022

Global Statistics

All countries
548,935,393
Confirmed
Updated on June 26, 2022 8:18 pm
All countries
520,730,887
Recovered
Updated on June 26, 2022 8:18 pm
All countries
6,350,765
Deaths
Updated on June 26, 2022 8:18 pm
Molderizer and Safe Shield

Mayo Clinic Reveals Data on Rebound COVID-19 Symptoms After Paxlovid Treatment

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COVID Virus Treatment

In a Mayo Clinic study published in the journal Clinical Infectious Diseases, only 4 people out of 483 high-risk patients treated with Paxlovid developed COVID-19 rebound symptoms.

Mayo Clinic researchers studied the outcomes of treating high-risk patients for COVID-19 with a five-day oral regimen of nirmatrelvir and ritonavir, which are together marketed as Paxlovid. Out of 483 high-risk patients, only a handful developed COVID rebound symptoms, and the scientists say more research is needed to determine why.

Overall, the Paxlovid treatment benefited everyone in the study. All patients recovered, including those who developed rebound symptoms, which were generally mild. The findings were published on June 14, 2022, in the journal Clinical Infectious Diseases.

“We found that rebound phenomenon was uncommon in this group of patients,” says senior author Aditya Shah, M.B.B.S., a Mayo Clinic infectious diseases physician and researcher. “The four individuals who experienced rebound (symptoms) represent only 0.8% of the group, and all of them recovered quickly without additional COVID-directed therapy.”

Most of the patients in the study had been vaccinated, and many had received booster vaccinations. The median age was 63. While these patients were high-risk for COVID-19, none was immunocompromised. Only two patients were admitted to the hospital, and it was for reasons other than COVID.

The study zeros in on four patients with rebound symptoms:

  • A 75-year-old man with coronary artery disease who had increased cough and muscle aches 19 days after treatment.
  • A 69-year-old man with hypertension and obesity who exhibited nasal discharge and cough 10 days following therapy.
  • A 40-year-old woman with obesity, hypertension, and kidney disease who developed fatigue and sore throat six days after treatment.
  • A 70-year-old man with a history of prostate cancer, obesity, hypertension, and high cholesterol, who developed significant sinus congestion 10 days after treatment.

Why did some rebound?

Researchers think one explanation could be that a replication of the SARS-CoV-2 virus — the virus that causes COVID-19 — may have triggered a secondary immune response that showed up as mild COVID-19 symptoms. They suggest further prospective studies could answer the question. They also note that all four patients with rebound symptoms had many serious health problems known as comorbidities — a factor known to complicate recoveries. Also, all four patients had been vaccinated more than 90 days before becoming infected with COVID-19.

Reference: “Rebound Phenomenon after Nirmatrelvir/Ritonavir Treatment of Coronavirus Disease-2019 in High-Risk Persons” by Nischal Ranganath, MD, PhD, John C. O’Horo, MD, MPH, Douglas W. Challener, MD, MS, Sidna M. Tulledge-Scheitel, MD, MPH, Marsha L. Pike, APRN, CNS, DNP, R. Michael O’Brien, Ph, Raymund R. Razonable, MD, Aditya Shah, MBBS, 14 June 2022, Clinical Infectious Diseases.
DOI: 10.1093/cid/ciac481

Mayo Clinic funded the study. Others on the study team include first author Nischal Ranganath M.D., Ph.D.; John O’Horo, M.D.; Douglas Challener, M.D.; Sidna Tulledge-Scheitel, M.D.; Marsha Pike, D.N.P.; Michael O’Brien; and Raymund Razonable, M.D. — all of Mayo Clinic.





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