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  1. Article ; Online: Author Correction: Real-world COVID-19 vaccine effectiveness against the Omicron BA.2 variant in a SARS-CoV-2 infection-naive population.

    Lau, Jonathan J / Cheng, Samuel M S / Leung, Kathy / Lee, Cheuk Kwong / Hachim, Asmaa / Tsang, Leo C H / Yam, Kenny W H / Chaothai, Sara / Kwan, Kelvin K H / Chai, Zacary Y H / Lo, Tiffany H K / Mori, Masashi / Wu, Chao / Valkenburg, Sophie A / Amarasinghe, Gaya K / Lau, Eric H Y / Hui, David S C / Leung, Gabriel M / Peiris, Malik /
    Wu, Joseph T

    Nature medicine

    2023  Volume 30, Issue 1, Page(s) 305

    Language English
    Publishing date 2023-12-30
    Publishing country United States
    Document type Published Erratum
    ZDB-ID 1220066-9
    ISSN 1546-170X ; 1078-8956
    ISSN (online) 1546-170X
    ISSN 1078-8956
    DOI 10.1038/s41591-023-02648-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Real-world COVID-19 vaccine effectiveness against the Omicron BA.2 variant in a SARS-CoV-2 infection-naive population.

    Lau, Jonathan J / Cheng, Samuel M S / Leung, Kathy / Lee, Cheuk Kwong / Hachim, Asmaa / Tsang, Leo C H / Yam, Kenny W H / Chaothai, Sara / Kwan, Kelvin K H / Chai, Zacary Y H / Lo, Tiffany H K / Mori, Masashi / Wu, Chao / Valkenburg, Sophie A / Amarasinghe, Gaya K / Lau, Eric H Y / Hui, David S C / Leung, Gabriel M / Peiris, Malik /
    Wu, Joseph T

    Nature medicine

    2023  Volume 29, Issue 2, Page(s) 348–357

    Abstract: The SARS-CoV-2 Omicron variant has demonstrated enhanced transmissibility and escape of vaccine-derived immunity. Although first-generation vaccines remain effective against severe disease and death, robust evidence on vaccine effectiveness (VE) against ... ...

    Abstract The SARS-CoV-2 Omicron variant has demonstrated enhanced transmissibility and escape of vaccine-derived immunity. Although first-generation vaccines remain effective against severe disease and death, robust evidence on vaccine effectiveness (VE) against all Omicron infections, irrespective of symptoms, remains sparse. We used a community-wide serosurvey with 5,310 subjects to estimate how vaccination histories modulated risk of infection in infection-naive Hong Kong during a large wave of Omicron BA.2 epidemic in January-July 2022. We estimated that Omicron infected 45% (41-48%) of the local population. Three and four doses of BNT162b2 or CoronaVac were effective against Omicron infection 7 days after vaccination (VE of 48% (95% credible interval 34-64%) and 69% (46-98%) for three and four doses of BNT162b2, respectively; VE of 30% (1-66%) and 56% (6-97%) for three and four doses of CoronaVac, respectively). At 100 days after immunization, VE waned to 26% (7-41%) and 35% (10-71%) for three and four doses of BNT162b2, and to 6% (0-29%) and 11% (0-54%) for three and four doses of CoronaVac. The rapid waning of VE against infection conferred by first-generation vaccines and an increasingly complex viral evolutionary landscape highlight the necessity for rapidly deploying updated vaccines followed by vigilant monitoring of VE.
    MeSH term(s) Humans ; COVID-19 Vaccines ; COVID-19 ; BNT162 Vaccine ; Vaccine Efficacy ; SARS-CoV-2
    Chemical Substances sinovac COVID-19 vaccine ; COVID-19 Vaccines ; BNT162 Vaccine
    Language English
    Publishing date 2023-01-18
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1220066-9
    ISSN 1546-170X ; 1078-8956
    ISSN (online) 1546-170X
    ISSN 1078-8956
    DOI 10.1038/s41591-023-02219-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Strength and durability of antibody responses to BNT162b2 and CoronaVac.

    Cowling, Benjamin J / Wong, Irene O L / Shiu, Eunice Y C / Lai, Amber Y T / Cheng, Samuel M S / Chaothai, Sara / Kwan, Kelvin K H / Martín-Sánchez, Mario / Poon, Leo L M / Ip, Dennis K M / Leung, Gabriel M / Leung, Nancy H L / Peiris, J S Malik

    Vaccine

    2022  Volume 40, Issue 32, Page(s) 4312–4317

    Abstract: We studied 2780 adults in Hong Kong who received CoronaVac inactivated virus vaccine (Sinovac) and BNT162b2 mRNA vaccine ("Comirnaty", BioNTech/Fosun Pharma). We compared rates of antibody waning over time using an enzyme-linked immunosorbent assay for ... ...

    Abstract We studied 2780 adults in Hong Kong who received CoronaVac inactivated virus vaccine (Sinovac) and BNT162b2 mRNA vaccine ("Comirnaty", BioNTech/Fosun Pharma). We compared rates of antibody waning over time using an enzyme-linked immunosorbent assay for spike receptor binding domain and a surrogate virus neutralization test. We found stronger and more durable antibody responses to two doses of the mRNA vaccine, and slightly stronger initial antibody responses to each vaccine in younger adults and women. The weaker and less durable responses following CoronaVac support earlier provision of third doses to persons who previously received two doses of this vaccine.
    MeSH term(s) Adult ; Antibodies, Viral ; Antibody Formation ; BNT162 Vaccine ; COVID-19 Vaccines ; Female ; Humans ; Vaccines, Synthetic ; mRNA Vaccines
    Chemical Substances Antibodies, Viral ; COVID-19 Vaccines ; Vaccines, Synthetic ; mRNA Vaccines ; BNT162 Vaccine (N38TVC63NU)
    Language English
    Publishing date 2022-06-11
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 605674-x
    ISSN 1873-2518 ; 0264-410X
    ISSN (online) 1873-2518
    ISSN 0264-410X
    DOI 10.1016/j.vaccine.2022.05.033
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Strength and durability of antibody responses to BNT162b2 and CoronaVac

    Cowling, Benjamin J. / Wong, Irene O.L. / Shiu, Eunice Y.C. / Lai, Amber Y.T. / Cheng, Samuel M.S. / Chaothai, Sara / Kwan, Kelvin K.H. / Martín-Sánchez, Mario / Poon, Leo L.M. / Ip, Dennis K.M. / Leung, Gabriel M. / Leung, Nancy H.L. / Malik Peiris, J.S.

    Vaccine. 2022 May 09,

    2022  

    Abstract: We studied 2780 adults in Hong Kong who received CoronaVac inactivated virus vaccine (Sinovac) and BNT162b2 mRNA vaccine (“Comirnaty”, BioNTech/Fosun Pharma). We compared rates of antibody waning over time using an enzyme-linked immunosorbent assay for ... ...

    Abstract We studied 2780 adults in Hong Kong who received CoronaVac inactivated virus vaccine (Sinovac) and BNT162b2 mRNA vaccine (“Comirnaty”, BioNTech/Fosun Pharma). We compared rates of antibody waning over time using an enzyme-linked immunosorbent assay for spike receptor binding domain and a surrogate virus neutralization test. We found stronger and more durable antibody responses to two doses of the mRNA vaccine, and slightly stronger initial antibody responses to each vaccine in younger adults and women. The weaker and less durable responses following CoronaVac support earlier provision of third doses to persons who previously received two doses of this vaccine.
    Keywords antibodies ; durability ; enzyme-linked immunosorbent assay ; neutralization tests ; vaccines ; viruses ; China
    Language English
    Dates of publication 2022-0509
    Publishing place Elsevier Ltd
    Document type Article
    Note Pre-press version
    ZDB-ID 605674-x
    ISSN 1873-2518 ; 0264-410X
    ISSN (online) 1873-2518
    ISSN 0264-410X
    DOI 10.1016/j.vaccine.2022.05.033
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Immunogenicity of a Third Dose of BNT162b2 to Ancestral Severe Acute Respiratory Syndrome Coronavirus 2 and the Omicron Variant in Adults Who Received 2 Doses of Inactivated Vaccine.

    Leung, Nancy H L / Cheng, Samuel M S / Martín-Sánchez, Mario / Au, Niki Y M / Ng, Yvonne Y / Luk, Leo L H / Chan, Karl C K / Li, John K C / Leung, Yonna W Y / Tsang, Leo C H / Chaothai, Sara / Kwan, Kelvin K H / Ip, Dennis K M / Poon, Leo L M / Leung, Gabriel M / Peiris, J S Malik / Cowling, Benjamin J

    Clinical infectious diseases : an official publication of the Infectious Diseases Society of America

    2022  Volume 76, Issue 3, Page(s) e299–e307

    Abstract: Background: Limited data exist on antibody responses to mixed vaccination strategies that involve inactivated coronavirus disease 2019 (COVID-19) vaccines, particularly in the context of emerging variants.: Methods: We conducted an open-label trial ... ...

    Abstract Background: Limited data exist on antibody responses to mixed vaccination strategies that involve inactivated coronavirus disease 2019 (COVID-19) vaccines, particularly in the context of emerging variants.
    Methods: We conducted an open-label trial of a third vaccine dose of a messenger RNA (mRNA) vaccine (BNT162b2, Fosun Pharma/BioNTech) in adults aged ≥30 years who had previously received 2 doses of inactivated COVID-19 vaccine. We collected blood samples before administering the third dose and 28 days later and tested for antibodies to the ancestral virus using a binding assay (enzyme-linked immunosorbent assay [ELISA]), a surrogate virus neutralization test (sVNT), and a live virus plaque reduction neutralization test (PRNT). We also tested for antibodies against the Omicron variant using live-virus PRNT.
    Results: In 315 participants, a third dose of BNT162b2 substantially increased antibody titers on each assay. Mean ELISA levels increased from an optical density of 0.3 to 2.2 (P < .001), and mean sVNT levels increased from an inhibition of 17% to 96% (P < .001). In a random subset of 20 participants, the geometric mean PRNT50 titers rose substantially, by 45-fold from day 0 to day 28 against the ancestral virus (P < .001) and by 11-fold against the Omicron variant (P < .001). In daily monitoring, post-vaccination reactions subsided within 7 days for more than 99% of participants.
    Conclusions: A third dose of COVID-19 vaccine with an mRNA vaccine substantially improved antibody levels against the ancestral virus and the Omicron variant with a well-tolerated safety profile in adults who had received 2 doses of inactivated vaccine 6 months earlier.
    Clinical trials registration: NCT05057182.
    MeSH term(s) Adult ; Humans ; Antibodies, Neutralizing ; Antibodies, Viral ; BNT162 Vaccine ; COVID-19/prevention & control ; COVID-19 Vaccines ; Immunogenicity, Vaccine ; RNA, Messenger ; SARS-CoV-2 ; Vaccines, Inactivated
    Chemical Substances Antibodies, Neutralizing ; Antibodies, Viral ; BNT162 Vaccine ; COVID-19 Vaccines ; RNA, Messenger ; Vaccines, Inactivated
    Language English
    Publishing date 2022-06-06
    Publishing country United States
    Document type Clinical Trial ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1099781-7
    ISSN 1537-6591 ; 1058-4838
    ISSN (online) 1537-6591
    ISSN 1058-4838
    DOI 10.1093/cid/ciac458
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Humoral and Cellular Immunogenicity of 3 Doses of BNT162b2 in Children With Kidney Diseases.

    Leung, Daniel / Chan, Eugene Yu-Hin / Mu, Xiaofeng / Rosa Duque, Jaime S / Cheng, Samuel M S / Ho, Fanny Tsz-Wai / Tong, Pak-Chiu / Lai, Wai-Ming / Lee, Matthew H L / Chim, Stella / Tam, Issan Y S / Tsang, Leo C H / Kwan, Kelvin K H / Chung, Yuet / Wong, Howard H W / Lee, Amos M T / Li, Wing Yan / Sze, Summer T K / Lam, Jennifer H Y /
    Lee, Derek H L / Chan, Sau Man / Tu, Wenwei / Peiris, Malik / Ma, Alison Lap-Tak / Lau, Yu Lung

    Kidney international reports

    2023  Volume 8, Issue 11, Page(s) 2356–2367

    Abstract: Introduction: Patients with severe kidney diseases are at risk of complications from COVID-19; however, little is known about the effectiveness of COVID-19 vaccines in children and adolescents with kidney diseases.: Methods: We investigated the ... ...

    Abstract Introduction: Patients with severe kidney diseases are at risk of complications from COVID-19; however, little is known about the effectiveness of COVID-19 vaccines in children and adolescents with kidney diseases.
    Methods: We investigated the immunogenicity and safety of an accelerated 3-dose primary series of COVID-19 vaccination among 59 pediatric patients with chronic kidney disease (CKD) (mean age 12.9 years; 30 male) with or without immunosuppression, dialysis, or kidney transplant. Dosage was 0.1 ml BNT162b2 to those aged 5 to 11 years, and 0.3 ml BNT162b2 to those aged 11 to 18 years.
    Results: Three doses of either vaccine type elicited significant antibody responses that included spike receptor-binding domain (S-RBD) IgG (90.5%-93.8% seropositive) and surrogate virus neutralization (geometric mean sVNT% level, 78.6%-79.3%). There were notable T cell responses. Weaker neutralization responses were observed among those on immunosuppression, especially those receiving higher number of immunosuppressants or on mycophenolate mofetil. Neutralization was reduced against Omicron BA.1 compared to wild type (WT, i.e., ancestral) (post-dose 3 sVNT% level; 82.7% vs. 27.4%;
    Conclusion: An accelerated 3-dose primary series with BNT162b2 is immunogenic and safe in young children and adolescents with kidney diseases.
    Language English
    Publishing date 2023-08-28
    Publishing country United States
    Document type Journal Article
    ISSN 2468-0249
    ISSN (online) 2468-0249
    DOI 10.1016/j.ekir.2023.08.014
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Comparative antibody and cell-mediated immune responses, reactogenicity, and efficacy of homologous and heterologous boosting with CoronaVac and BNT162b2 (Cobovax): an open-label, randomised trial.

    Leung, Nancy H L / Cheng, Samuel M S / Cohen, Carolyn A / Martín-Sánchez, Mario / Au, Niki Y M / Luk, Leo L H / Tsang, Leo C H / Kwan, Kelvin K H / Chaothai, Sara / Fung, Lison W C / Cheung, Alan W L / Chan, Karl C K / Li, John K C / Ng, Yvonne Y / Kaewpreedee, Prathanporn / Jia, Janice Z / Ip, Dennis K M / Poon, Leo L M / Leung, Gabriel M /
    Peiris, J S Malik / Valkenburg, Sophie A / Cowling, Benjamin J

    The Lancet. Microbe

    2023  Volume 4, Issue 9, Page(s) e670–e682

    Abstract: Background: Few trials have compared homologous and heterologous third doses of COVID-19 vaccination with inactivated vaccines and mRNA vaccines. The aim of this study was to assess immune responses, safety, and efficacy against SARS-CoV-2 infection ... ...

    Abstract Background: Few trials have compared homologous and heterologous third doses of COVID-19 vaccination with inactivated vaccines and mRNA vaccines. The aim of this study was to assess immune responses, safety, and efficacy against SARS-CoV-2 infection following homologous or heterologous third-dose COVID-19 vaccination with either one dose of CoronaVac (Sinovac Biotech; inactivated vaccine) or BNT162b2 (Fosun Pharma-BioNTech; mRNA vaccine).
    Methods: This is an ongoing, randomised, allocation-concealed, open-label, comparator-controlled trial in adults aged 18 years or older enrolled from the community in Hong Kong, who had received two doses of CoronaVac or BNT162b2 at least 6 months earlier. Participants were randomly assigned, using a computer-generated sequence, in a 1:1 ratio with allocation concealment to receive a (third) dose of CoronaVac or BNT162b2 (ancestral virus strain), stratified by types of previous COVID-19 vaccination (homologous two doses of CoronaVac or BNT162b2). Participants were unmasked to group allocation after vaccination. The primary endpoint was serum neutralising antibodies against the ancestral virus at day 28 after vaccination in each group, measured as plaque reduction neutralisation test (PRNT
    Findings: We enrolled participants from Nov 12, 2021, to Jan 27, 2022. We vaccinated 219 participants who previously received two doses of CoronaVac, including 101 randomly assigned to receive CoronaVac (CC-C) and 118 randomly assigned to receive BNT162b2 (CC-B) as their third dose; and 232 participants who previously received two doses of BNT162b2, including 118 randomly assigned to receive CoronaVac (BB-C) and 114 randomly assigned to receive BNT162b2 (BB-B) as their third dose. The PRNT
    Interpretation: Similar levels of incidence of, presumably, omicron BA.2 infections were observed in each group despite very weak antibody responses to BA.2 in the recipients of a CoronaVac third dose. Further research is warranted to identify appropriate correlates of protection for inactivated COVID-19 vaccines.
    Funding: Health and Medical Research Fund, Hong Kong.
    Translation: For the Chinese translation of the abstract see Supplementary Materials section.
    MeSH term(s) Adult ; Humans ; COVID-19 Vaccines/adverse effects ; BNT162 Vaccine ; COVID-19/prevention & control ; SARS-CoV-2 ; Antibodies ; Immunity
    Chemical Substances sinovac COVID-19 vaccine ; COVID-19 Vaccines ; BNT162 Vaccine ; Antibodies
    Language English
    Publishing date 2023-08-04
    Publishing country England
    Document type Randomized Controlled Trial ; Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ISSN 2666-5247
    ISSN (online) 2666-5247
    DOI 10.1016/S2666-5247(23)00216-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Immunogenicity against wild-type and Omicron SARS-CoV-2 after a third dose of inactivated COVID-19 vaccine in healthy adolescents.

    Leung, Daniel / Cohen, Carolyn A / Mu, Xiaofeng / Rosa Duque, Jaime S / Cheng, Samuel M S / Wang, Xiwei / Wang, Manni / Zhang, Wenyue / Zhang, Yanmei / Tam, Issan Y S / Lam, Jennifer H Y / Chan, Sau Man / Chaothai, Sara / Kwan, Kelvin K H / Chan, Karl C K / Li, John K C / Luk, Leo L H / Tsang, Leo C H / Chu, Nym Coco /
    Wong, Wilfred H S / Mori, Masashi / Leung, Wing Hang / Valkenburg, Sophie / Peiris, Malik / Tu, Wenwei / Lau, Yu Lung

    Frontiers in immunology

    2023  Volume 14, Page(s) 1106837

    Abstract: Introduction: Two doses of inactivated SARS-CoV-2 vaccine CoronaVac cannot elicit high efficacy against symptomatic COVID-19, especially against the Omicron variant, but that can be improved by a third dose in adults. The use of a third dose of ... ...

    Abstract Introduction: Two doses of inactivated SARS-CoV-2 vaccine CoronaVac cannot elicit high efficacy against symptomatic COVID-19, especially against the Omicron variant, but that can be improved by a third dose in adults. The use of a third dose of CoronaVac in adolescents may be supported by immunobridging studies in the absence of efficacy data.
    Methods: With an immunobridging design, our study (NCT04800133) tested the non-inferiority of the binding and neutralizing antibodies and T cell responses induced by a third dose of CoronaVac in healthy adolescents (N=94, median age 14.2 years, 56% male) compared to adults (N=153, median age 48.1 years, 44% male). Responses against wild-type (WT) and BA.1 SARS-CoV-2 were compared in adolescents. Safety and reactogenicity were also monitored.
    Results: A homologous third dose of CoronaVac further enhanced antibody response in adolescents compared to just 2 doses. Adolescents mounted non-inferior antibody and T cell responses compared to adults. Although S IgG and neutralizing antibody responses to BA.1 were lower than to WT, they remained detectable in 96% and 86% of adolescents. T cell responses to peptide pools spanning only the mutations of BA.1 S, N and M in adolescents were preserved, increased, and halved compared to WT respectively. No safety concerns were identified.
    Discussion: The primary vaccination series of inactivated SARS-CoV-2 vaccines for adolescents should include 3 doses for improved humoral immunogenicity.
    MeSH term(s) Adult ; Adolescent ; Male ; Humans ; Middle Aged ; Female ; COVID-19 Vaccines ; SARS-CoV-2 ; COVID-19/prevention & control ; Antibodies, Neutralizing
    Chemical Substances sinovac COVID-19 vaccine ; COVID-19 Vaccines ; Antibodies, Neutralizing
    Language English
    Publishing date 2023-03-06
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2606827-8
    ISSN 1664-3224 ; 1664-3224
    ISSN (online) 1664-3224
    ISSN 1664-3224
    DOI 10.3389/fimmu.2023.1106837
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Humoral and Cellular Immunogenicity and Safety of 3-Dose Inactivated COVID-19 Vaccine in Young Children Less Than 5 Years With Kidney Diseases.

    Chan, Eugene Yu-Hin / Leung, Daniel / Cheng, Samuel M S / Rosa Duque, Jaime S / Mu, Xiaofeng / Ho, Fanny Tsz-Wai / Tong, Pak-Chiu / Lai, Wai-Ming / Lee, Matthew H L / Chim, Stella / Tam, Issan Y S / Tsang, Leo C H / Kwan, Kelvin K H / Chung, Yuet / Wong, Howard H W / Lee, Amos M T / Li, Wing Yan / Sze, Summer T K / Lam, Jennifer H Y /
    Lee, Derek H L / Chan, Sau Man / Tu, Wenwei / Peiris, Malik / Ma, Alison Lap-Tak / Lau, Yu Lung

    Kidney international reports

    2023  Volume 8, Issue 10, Page(s) 2177–2179

    Language English
    Publishing date 2023-08-19
    Publishing country United States
    Document type Journal Article
    ISSN 2468-0249
    ISSN (online) 2468-0249
    DOI 10.1016/j.ekir.2023.08.012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Strength and durability of antibody responses to BNT162b2 and CoronaVac

    Cowling, Benjamin J. / Wong, Irene O. L. / Shiu, Eunice Y. C. / Lai, Amber Y. T. / Cheng, Samuel M. S. / Chaothai, Sara / Kwan, Kelvin K. H. / Martin-Sanchez, Mario / Poon, Leo L. M. / Ip, Dennis K. M. / Leung, Gabriel M. / Leung, Nancy H. L. / Peiris, Malik

    medRxiv

    Abstract: We studied 2864 adults in Hong Kong who received CoronaVac inactivated virus vaccine (Sinovac) and BNT162b2 mRNA vaccine (Comirnaty, BioNTech/Fosun Pharma). We found stronger and more durable antibody responses to two doses of the mRNA vaccine, and ... ...

    Abstract We studied 2864 adults in Hong Kong who received CoronaVac inactivated virus vaccine (Sinovac) and BNT162b2 mRNA vaccine (Comirnaty, BioNTech/Fosun Pharma). We found stronger and more durable antibody responses to two doses of the mRNA vaccine, and slightly stronger initial antibody responses to each vaccine in younger adults and women.
    Keywords covid19
    Language English
    Publishing date 2022-02-15
    Publisher Cold Spring Harbor Laboratory Press
    Document type Article ; Online
    DOI 10.1101/2022.02.11.22270848
    Database COVID19

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