Evaluating variations in viral and symptom rebounds between Paxlovid-treated and untreated COVID-19 sufferers

In a latest research posted to the medRxiv* preprint server, researchers evaluated variations in viral and symptom rebounds between Paxlovid-treated and untreated coronavirus illness 2019 (COVID-19) sufferers.

Examine: The Paxlovid Rebound Examine: A Potential Cohort Examine to Consider Viral and Symptom Rebound Variations Between Paxlovid and Untreated COVID-19 Contributors. Picture Credit score: ahmad.faizal/Shutterstock


Research have documented returning or rebounding of extreme acute respiratory syndrome coronavirus 2 (SARS-CoV-2) an infection signs with elevated viral masses following Paxlovid therapy. Curiously, research have additionally reported viral, and symptom rebounds amongst people not handled with therapeutic brokers that would resolve signs.

Analysis has indicated that the rebounds could also be related to Paxlovid pharmacodynamic properties or antiviral drug interactions with immune responses to SARS-CoV-2. Nonetheless, scientific peer-reviewed Paxlovid rebound information has largely been based mostly on retrospective research designs.

In regards to the research

Within the potential cohort research, researchers prospectively in contrast Paxlovid rebound epidemiology amongst handled sufferers and untreated sufferers with acute SARS-CoV-2 infections.

The decentralized and digital research comprised people who examined SARS-CoV-2-positive utilizing the eMed Check-to-Deal with telehealth diagnostic kits and might be prescribed Paxlovid therapy for evaluating SARS-CoV-2 clearance and rebound COVID-19 signs. Based mostly on drug acceptability, the members had been allotted to both a Paxlovid (therapy) group or a management group.

Solely adults with SARS-CoV-2-positive studies of speedy antigen assessments and Paxlovid prescriptions from eMed telehealth proctoring had been included within the evaluation.

The Paxlovid group members had been supplied e mail hyperlinks to entry research supplies and telehealth-proctored speedy antigen check kits for at-home testing. Paxlovid group members accomplished their preliminary SARS-CoV-2 at-home testing and surveys associated to COVID-19 signs skilled on the second and fifth day of Paxlovid therapy, and subsequently, each alternate day as much as 16 days, after which, the people accomplished surveys about lengthy COVID/persistent signs at 1.0-, 3.0-, and 6.0-monthly intervals.

The staff evaluated the SARS-CoV-2 rebound based mostly on check studies and the rebound of COVID-19 signs based mostly on patient-documented signs and excluded people who couldn’t converse in English and didn’t reside in the US. The prime research endpoints had been incidence charges of SARS-CoV-2 (testing) and the rebound of COVID-19 signs within the two teams following acute SARS-CoV-2 infections. Secondary research endpoints included the length for decision of COVID-19 signs, length for a SARS-CoV-2-negative speedy antigen check, length between a SARS-CoV-2-negative check report back to a SARS-CoV-2-positive check rebound, and the frequency of COVID-19 signs within the two teams throughout acute COVID-19 and the 1.0-month interval. 


Between 4 August 2022 and 1 November 2022, 247 people confirmed participation willingness, of which 188 people completed the 16.0-day procedures. The staff excluded People who accomplished <2.0 surveys or had <2.0 check studies or those that crammed out surveys after the outlined schedule, leading to a pattern measurement of 170 people, of which 127 and 43 comprised the therapy group and management group, respectively. Viral rebound incidence was 14% and 9 % amongst Paxlovid-treated and untreated people, respectively.

COVID-19 symptom rebound incidence among the many corresponding group of people was 19% and 7 %, respectively. No vital variations had been noticed within the viral rebound by intercourse, age, comorbidities, or major symptom teams within the acute COVID-19 interval or on the 1.0-month interval. Extra Paxlovid-treated people had been White. Moreover, the length for SARS-CoV-2 clearance was comparable between the therapy and management teams (seven days in each teams).

Likewise, the length between the onset of COVID-19 signs and the decision of the primary symptom (common ten days versus 11 days) and the length between symptom onset and the primary SARS-CoV-2-negative speedy antigen check report (a median of six days in each teams) had been comparable within the corresponding teams. Almost 20% of research members within the two teams remained SARS-CoV-2-positive by speedy antigen testing even 10.0 days after the preliminary optimistic report.

People with rebounds reported lesser physique aches than people with no rebound. The frequency of Native Individuals and Asians was decrease amongst people with a rebound. Amongst controls, for 2 people, the symptom rebound lasted <5.0 days, and for one, the rebound lasted ≥5.0 days. The corresponding variety of handled people was 10 and 10, respectively. As well as, for 4 handled people, >1.0 signs of SARS-CoV-2 infections rebounded throughout follow-up.


General, the preliminary report findings of the potential cohort research confirmed that rebound after clearance of check positivity or symptom decision was larger than beforehand reported. Nonetheless, the rebound charges had been comparable among the many two teams. Additional analysis with bigger and extra various pattern populations and longer follow-up durations is required to enhance understanding of the rebounds.

Gaining beneficial insights into the medical and demographical traits associated to rebound growth is important to tailor the length of therapy and the therapy timing or to determine and advise particular populations at elevated threat of growing rebounds. The rebounds might lead to unintentional viral transmission after people check SARS-CoV-2-negative, and the symptom return might discourage people from searching for therapy for stopping COVID-19 development.

*Essential discover

medRxiv publishes preliminary scientific studies that aren’t peer-reviewed and, subsequently, shouldn’t be thought to be conclusive, information medical follow/health-related conduct, or handled as established info.

Add a Comment

Your email address will not be published.