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Table 1 Study characteristics of selected records

From: Viral reactivations and co-infections in COVID-19 patients: a systematic review

Author (year)

Study site

Study design

Study setting

Total sample size

Agea

Outcome measure/Diagnosis of interest

COVID-19 Diagnostic method

Diagnostic method for outcome measure and relevant clinical outcomesb

Aldhaleei et al. (2020) [36]

United Arab Emirates

Case report

Inpatient (ICU)

1

36 years

COVID-19 induced HBV reactivation

RT-PCR

Blood tests (biochemistry, CBC, serology for HB core Ab, HBe Ag and Ab)

Aldehaim et al. (2022) [41]

Saudi Arabia

Case report

Inpatient (ICU)

1

47 years

CMV Pneumonitis in a COVID-19 patient with systemic lupus erythematosus and interstitial pneumonia

RT-PCR

Chest examination, CMV PCR, microscopy and staining, blood tests (CBC, biochemistry)

Ananthegowda et al. (2021) [42]

Qatar

Case report

Inpatient (ICU)

1

55 years

CMV meningoencephalitis in severe COVID-19 patients

RT-PCR

CMV CSF PCR, CSF analysis, Brain MRI, blood tests (CBC, biochemistry)

Carll et al. (2021) [43]

United states

Case report

Inpatient

1

Not reported

CMV hemorrhagic enterocolitis in severe COVID-19 patient

RT-PCR

Blood tests (biochemistry, CBC, CMV PCR), IHC

Das et al. (2022) [19]

India

Case report

Ambulatory care

1

73 years

Recurrent herpes simplex keratitis in a patient with a previous history of COVID-19 diagnosis

Tool not specified, based on the patient history

Ophthalmological exam, HSV-1 RT-PCR

Drago et al. (2021) [16]

Italy

Editorial letter (case report)

Ambulatory care

1

16 years

Pityriasis rosea (PR) diagnosis from the EBV, HHV-6, HHV-7 reactivations

RT-PCR

Blood tests (CBC, serology for all three viruses, including EBV IgM, EBV VCA, anti-VCA IgG, anti-early antigen IgG, anti EBV nuclear antigen IgG, HHV-6 and 7 IgM and IgG, RT-PCR for all three viruses, physical examination

Duong et al. (2021) [44]

Not reported

Case report

Inpatient

1

59 years

CMV induced acute hepatitis in COVID-19 patient

Tool not specified, based on medical records

CMV PCR, CBC

Ferreira et al. (2020) [45]

Brazil

Case report

Ambulatory care

1

39 years

VZV and COVID-19 co-infection

RT-PCR

Physical examination, brain MRI, blood tests (cytokine biochemistry, CBC, VZV IgM serology)

Figueredo et al. (2021) [46]

USA

Case report

Inpatient (ICU)

1

55 years

HBV reactivation in COVID-19 patient post tocilizumab therapy

Tool not specified, based on medical records

HBV PCR and serology for for HBV core Ab, HBe Ab, HBe Ag, HBV surface Ab, HBV surface Ag

Gardini et al. (2021) [47]

Italy

Case report

Inpatient (ICU)

1

61 years

Kaposi sarcoma in immunocompetent patient with SARS-CoV-2 infection

RT-PCR

Blood tests (CBC, biochemistry), neck ultrasound, CT scan, histologic examination, HHV-8 PCR

Ghobrial et al. (2021) [48]

USA

Case report

Inpatient (ICU)

1

72 years

CMV induced rectal ulcer in immunocompromised COVID-19 patient

Tool not specified, based on medical records

Biopsy and plasma CMV PCR

Gonzalez et al. (2021) [49]

Puerto Rico

Case report

Inpatient

1

32 years

HSV-2 induced ARN reactivation

RT-PCR

Ophthalmological exam, vitreous PCR for HSV-2, serology test for HSV-2 IgG

Librero et al. (2021) [50]

Spain

Case report

Inpatient

1

37 years

HBV reactivation in COVID-19 patient with a history of chronic HBV infection

Tool not specified, but indicated as laboratory confirmed

HBV PCR, blood test (biochemistry)

Khatib et al. (2021) [51]

Qatar

Case report

Inpatient

1

42 years

CMV colitis in SARS-CoV-2 patient on immunosuppressive treatment

RT-PCR

Blood test (cytokine, serology [not specified], biochemistry), CT scan, histologic examination

Magri et al. (2021) [52]

Italy

Case report

Inpatient

1

83 years

Kaposi Sarcoma in SARS-CoV-2 patient

NP swab, tool not specified

Physical examination, biopsy, histologic examination, serology test for HHV-8 antibodies (not specified)

Maillet et al. (2021) [53]

France

Case report

Inpatient (ICU)

1

75 years

CMV reactivation induced proctitis in an immunocompetent COVID-19 patient treated with immunomodulators

RT-PCR

Blood tests (biochemistry, CBC), CT scan, colonoscopy, stool culture, blood CMV PCR, rectal biopsy with immunohistochemistry staining

Mikami et al. (2021) [54]

France

Case report

Ambulatory care

1

28 years

CMV and parvovirus B19 infection in a SARS-CoV-2 IgG positive patient

RT-PCR, antibody test (tool not specified)

Physical examination, blood tests (serology for CMV-IgG, CMV-IgM, B19-IgM, biochemistry, CBC, coagulation)

Nadeem et al. (2021) [55]

USA

Case report

Inpatient

1

62 years

EBV coinfection with mild COVID-19 infection

Tool not specified, based on medical records

CT scan, blood tests (biochemistry, serology for EBV viral capsid (VCA) IgM, VCA IgG, EBV EA IgG, EBV NA IgG, coagulation)

Porzionato et al. (2021) [56]

Italy

Case report

Autopsy

1

Not reported

HSV-1 DNA detection and hypopharyngeal ulcers in a deceased COVID-19 patient

RT-PCR

RT-PCR, immunohistochemistry, histologic examination

Shi et al. (2021) [57]

China

Case report

Inpatient

1

66 years

HHV-1 reactivation in a critically ill COVID-19 patient

RT-qPCR

Metagenomic next-generation sequencing, blood test (CBC, biochemistry), Chest X-rays

Wu et al. (2021) [58]

China

Case report

Inpatient

1

45 years

HBV reactivation in COVID-19 patient

RT-PCR

Blood tests (CBC, biochemistry, serology test for HBV surface antigen, HBV surface antibody, HBe Ag, HBe Ab, HBV core antibody), PCR

Xu et al. (2020) [20]

China

Case report

Inpatient (ICU)

1

73 years

Co-reactivations of HSV-1 and VZV in COVID-19 patient

RT-PCR

NGS tests on blood, sputum, and BALF samples, optic bronchoscopy

Yun et al. (2022) [59]

South Korea

Case report

Inpatient

1

18 years

VZV meningitis in COVID-19 patient

RT-PCR

CSF analysis for CBC, CSF PCR

Busani et al. (2021) [60]

Italy

Case series

Inpatient (ICU)

2

Pt 1: 66 years, Pt 2: 49 years

HSV-1 induced acute liver failure in COVID-19 patients

NP swab, tool not specified

Blood tests (biochemistry, coagulation), RT-PCR, CT scan, CSF analysis, histologic examination, chemiluminescence-immunoassay

Hashemi et al. (2020) [61]

Iran

Case series

Inpatient (ICU)

2

Pt 1: 78 years, Pt 2: 75 years

Detection of secondary respiratory pathogens (influenza viruses) in COVID-19 patients with suspected acute respiratory syndrome

NP swab, tool not specified

Blood tests (biochemistry, Influenza virus IgM serology, coagulation)

Kim et al. (2022) [62]

USA

Case series

Retrospective database review

11

Mean age of 59.54 years

Clinical manifestations of patients with SARS-CoV-2 and CMV co-infection

Based on medical records (RT-PCR indicated)

Medical records (CMV PCR indicated)

Moniz et al. (2021) [63]

NA

Case series

Inpatient (ICU)

5

Pt 1: 64 years, Pt 2: 61 years, Pt 3: 61 years, Pt 4: 77 years, Pt 5: 78 years

CMV infection in COVID-19 patients with pneumonia

RT-PCR

CMV PCR (plasma or BAL)

Siddiqui et al. (2022) [64]

India

Case series

Inpatient (ICU)

3

Pt 1: 54 years, Pt 2: 57 years, Pt 3: 62 years

CMV and COVID-19 coinfection

RT-PCR

Blood tests (biochemistry, coagulation, blood smear, CBC), CMV PCR (BAL), bone marrow histologic examination, ophthalmologic examination

Soni et al. (2021) [65]

India

Case series

Ambulatory care

2

Pt 1: 5 years, Pt 2: 61 years

HSV-1 induced ARN in patients with previous history of SARS-CoV-2 infection

RT-PCR

RT-PCR (vitreous sample), ophthalmologic examination

Talan et al. (2022) [66]

Turkey

Case series

Inpatient (ICU)

218

67.7 years (53–84)

CMV reactivation in severe COVID-19 patients

RT-PCR

PCR, CBC

Chen et al. (2021) [67]

China

Cohort

Inpatient

188

36 years (28–52)

Comparison of disease progression between EBV and SARS-CoV-2 co-infection and SARS-CoV-2 alone

RT-PCR

Blood tests (serology for anti-VCA IgM, anti-VCA IgG, anti-EBNA IgG, anti-EA IgM, anti-EA IgM, anti-VCA IgM, biochemistry)

Franceschini et al. (2021) [68]

Italy

Cohort

Inpatient

70

72 years (66–76)

Clinical manifestations from HSV-1 reactivations in COVID-19 patients

RT-PCR

HSV-1 BAL quantitative assay (PCR), blood tests (CBC, biochemistry, cytokine)

Fuest et al. (2022) [69]

Germany

Cohort

Inpatient (ICU)

134

72.5 years (60–78)

Prevalence of HSV-1 and CMV among critically ill COVID-19 patients and the impact of the viruses on patient outcomes, course of disease, and dexamethasone treatment

RT-PCR

CMV and HSV RT-PCR of endotracheal aspirates (ETA), bronchoalveolar lavage (BAL) fluid, and EDTA blood samples, blood tests (CBC, biochemistry)

Gatto et al. (2022) [70]

Italy

Cohort

Inpatient (ICU)

431

65 years (56–72)

Incidence and risk factors of CMV reactivation among critically ill COVID-19 patients

Tool not specified, but indicated as laboratory confirmed

CMV PCR, CT scan, chest X-ray, blood tests (CBC, biochemistry, PCT)

Giacobbe et al. (2021) [71]

Italy

Cohort

Inpatient

41

65 years (60–70)

Cumulative risk of HSV-1 reactivation, its risk factors, and impact on prognosis of critically ill SARS-CoV-2 patients

RT-PCR

HSV-1 BALF quantitative assay (PCR), blood tests (biochemistry, CBC, coagulation)

Hu et al. (2020) [72]

China

Cohort

Inpatient

70

62.8 ± 12.8 years

Comparison of COVID-19 severity and clinical outcomes between patients with and without Influenza A virus infection

RT-PCR

Blood tests (biochemistry, serology)

le balc’h et al. (2020) [15]

France

Editorial letter (cohort)

Inpatient (ICU)

39

64 years (55–72)

HSV and CMV reactivations in COVID-19 patients

RT-PCR

HSV and CMV qRT-PCR, blood tests (CBC)

Lozano et al. (2021) [63]

Spain

Cohort

Inpatient (ICU)

12

37 years (23–50)

Maternal and neonatal outcomes (including CMV reactivations) associated with tocilizumab treatment in pregnant women with severe COVID-19

RT-PCR

Physical examinations, EMR review, blood tests (serology for CMV IgM, IgG, biochemistry, coagulation), CMV PCR

Lino et al. (2022) [34]

Brazil

Cohort

Inpatient

173

52.3 ± 22.9 years

Frequency and clinical impact of HHV-6 coinfection in moderate to critically ill COVID-19 patients

RT-PCR

RT-qPCR, Sanger sequencing, blood test (biochemistry, CBC)

Liu et al. (2020) [35]

China

Cohort

Inpatient

347

Not reported

Comparing liver function changes and disease progression in COVID-19 patients with and without chronic hepatitis B virus infection

Tool not specified, but indicated as admission due to COVID-19

Blood tests (biochemistry, serology for HBsAg), RT-PCR

Meng et al. (2022) [73]

China

Cohort

Inpatient

1314

Not reported

Incidence of EBV reactivation and its impact on the effect of ganciclovir treatment in COVID-19 patients

RT-PCR

Blood tests (biochemistry, CBC, coagulation, ELISA for VCA-IgG, EBV nuclear antigen IgG (EBNA-IgG), VCA-IgM, EA-IgG, CMV-IgG, and CMV-IgM), APACHEII and SOFA scores

Meyer et al. (2021) [74]

France

Cohort

Inpatient (ICU)

153

61.9 years (50.9–70.8)

Impact of HSV reactivation on mortality and HAP/VAP among severe COVID-19 patients

RT-PCR

Blood tests (biochemistry, CBC, coagulation, culture), RT-PCR

Paolucci et al. (2021) [75]

Italy

Cohort

Inpatient (ICU & SICU)

104

ICU: 61.5 years (55–71.25), SICU: 73.5 years (57.8–70)

Opportunistic viral reactivation (EBV reactivation) in COVID-19 patients of varying severity

RT-PCR

Blood test (flow cytometry, chemiluminescent assay)

Peluso et al. (2022) [76]

NA

Cohort (preprint)

Inpatient

280

45 years (35–56)

Comparing EBV prevalence in COVID patients with and without Long COVID symptoms

RT-PCR

qPCR, SIMOA

Saade et al. (2021) [23]

France

Cohort

Inpatient (ICU)

100

60 years (53–67)

Cumulative incidence and risk factors of HSV, EBV, CMV reactivations in severe COVID-19 patients

Not reported

RT-PCR (whole blood, BAL, skin swab) for all viruses, blood tests (CBC, biochemistry)

Seeßle et al. (2021) [77]

Germany

Cohort

Inpatient (ICU)

103

71 years (16)

Frequency and predisposing factors of HSV-1 reactivation in COVID-19 patients

RT-PCR

RT-PCR (BAL or tracheal aspirates) for viral nucleic acid detection and gene expression analysis, FACS for comprehensive immunophenotyping, blood tests (PCT, CBC, biochemistry, cytokine)

Simonnet et al. (2021) [17]

France

Cohort

Inpatient (ICU)

34

58 years (26–81)

Incidence of HHV-6, EBV, and CMV in critically ill COVID-19 patients

RT-PCR

qPCR for all three viruses, chemiluminescence immunoassays

Yang et al. (2022) [78]

China

Cohort

Inpatient (ICU)

2899

71.67 ± 10.07 years

Disease severity and risk factors comparison among SARS-CoV-2 positive patients with different stages of HBV infection

RT-PCR, Chest CT scan

Blood tests (serology test for HBsAg, HBeAg, anti-HBs, anti-HBe, anti-Hbc, biochemistry)

Yue et al. (2020) [33]

China

Cohort

Not reported

307

Influenza A: 61 years (24–68), Influenza B: 56 years (43–66.5)

Clinical characteristics of influenza virus infections in SARS-CoV-2 positive patients

RT-PCR

Blood tests (serology for IAV and IBV IgM, biochemistry)

Zubchenko et al. (2022) [79]

Ukraine

Cohort

Inpatient

88

41.4 ± 6.7 years

Post-COVID manifestations and herpes virus reactivations including EBV, HHV-6, and CMV

Tool not specified, based on medical records

PCR on blood, saliva, and oropharynx samples, ELISA for EBNA-IgG and VCA-IgG, blood tests (CBC, biochemistry, coagulation)

Xie et al. (2021) [22]

China

Cohort

Inpatient

1516

Mean age of 62 years

Clinical outcomes of critically ill COVID-19 patients with EBV reactivation

RT-PCR

EBV RT-PCR, Blood tests (serology for EBV EA IgG and IgM, capsid IgM)

Im et al. (2022) [80]

South Korea

Cross-sectional (relevant to this study)

Inpatient

269

Mean age of 61.6 years

Impact of EBV viremia on COVID-19 severity and prognosis

RT-PCR

EBV RT-PCR, multicolor flow cytometry for lymphocyte subpopulation

Vigón et al. (2021) [81]

Spain

Cross-sectional

Inpatient (ICU)

61

66 years (42–90)

Immunological parameters and herpesvirus reactivations (CMV, EBV) in COVID-19 patients

RT-PCR

ELISA for anti-CMV/IgG, chemiluminescent immunoassay for EBV VCA IgG qPCR for both viruses, ADCC assay

  1. CMV cytomegalovirus, EBV Epstein Barr virus, HSV-1, HSV-2 human herpes simplex type 1, 2, HHV-6, HHV-7 human herpes virus type 6, 7, IAV influenza A virus, IBV influenza B virus, VZV varicella zoster virus, B19 parvovirus B19, ADCC antibody-mediated cytotoxicity assay, BALF/BAL bronchoalveolar lavage fluid, CBC complete blood count, CSF central spinal fluid, ELISA enzyme-linked immunosorbent assay, EMR electronic medical records, FACS fluorescence-activated cell sorting, NGS next generation sequencing, PCR polymerase chain reaction, RT-PCR reverse transcription PCR, qPCR quantitative PCR, ICU Intensive Care Unit, IHC immunohistochemistry, SICU Surgical Intensive Care Unit, PCT procalcitonin, APACHEII Acute Physiology and Chronic Health Evaluation II, SOFA Sequential Organ Failure Assessment, MRI magnetic resonance imaging, Ag antigen, Ab antibody, VCA viral capsid antigen, IgM immunoglobulin M, IgG immunoglobulin G, EA early antibody, NA nuclear antigen, HBsAg hepatitis B surface antigen, HBeAg hepatitis B e antigen
  2. aAge: Median age with IQR in brackets, mean age with ± SD
  3. bSerology: Indicated as general serology test when tool is not specified