World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Microbiology 73 1654 1500 711 620 319 19780

Nicola P. Klein publications per year

The chart shows the history of publications by Nicola P. Klein between 2006 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Nicola P. Klein published across 20 years, from 2006 to 2025, averaging 20.8 papers a year. Output peaked at 42 publications in 2022. 65 of the 415 publications appeared in the last two years.

No. of publications
10 20 30 40
Bar chart. Horizontal axis: year, 2006 to 2025. Vertical axis: number of publications, 0 to 42. Peak 42 publications in 2022. 2006: 2 publications 2007: 2 publications 2008: 3 publications 2009: 4 publications 2010: 9 publications 2011: 13 publications 2012: 21 publications 2013: 15 publications 2014: 13 publications 2015: 16 publications 2016: 19 publications 2017: 33 publications 2018: 26 publications 2019: 34 publications 2020: 28 publications 2021: 36 publications 2022: 42 publications 2023: 34 publications 2024: 32 publications 2025: 33 publications
2006 2025

415 publications in total across all disciplines

View publications per year as a table
Nicola P. Klein: publications per year, 2006 to 2025
Year Publications
2006 2
2007 2
2008 3
2009 4
2010 9
2011 13
2012 21
2013 15
2014 13
2015 16
2016 19
2017 33
2018 26
2019 34
2020 28
2021 36
2022 42
2023 34
2024 32
2025 33
Total 415
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Nicola P. Klein publication distribution in Microbiology in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Microbiology in 2026. The highlighted bar marks where Nicola P. Klein sits on this spectrum.

No. of scientists
50 100 150 200 250
Bar chart with 64 bars. Horizontal axis: publications, 55–64 to 679+. Vertical axis: number of scientists, 0 to 288. Most scientists, 288, have 135–144 publications. The last bar groups every scientist with 679 publications or more. The highlighted bar, 315–324 publications, is where this scientist sits. 55–64 publications: 8 scientists 65–74 publications: 29 scientists 75–84 publications: 55 scientists 85–94 publications: 112 scientists 95–104 publications: 137 scientists 105–114 publications: 190 scientists 115–124 publications: 235 scientists 125–134 publications: 234 scientists 135–144 publications: 288 scientists 145–154 publications: 265 scientists 155–164 publications: 264 scientists 165–174 publications: 253 scientists 175–184 publications: 276 scientists 185–194 publications: 190 scientists 195–204 publications: 234 scientists 205–214 publications: 208 scientists 215–224 publications: 198 scientists 225–234 publications: 155 scientists 235–244 publications: 161 scientists 245–254 publications: 160 scientists 255–264 publications: 146 scientists 265–274 publications: 139 scientists 275–284 publications: 148 scientists 285–294 publications: 115 scientists 295–304 publications: 96 scientists 305–314 publications: 88 scientists 315–324 publications: 106 scientists 325–334 publications: 65 scientists 335–344 publications: 76 scientists 345–354 publications: 64 scientists 355–364 publications: 62 scientists 365–374 publications: 65 scientists 375–384 publications: 61 scientists 385–394 publications: 34 scientists 395–404 publications: 44 scientists 405–414 publications: 36 scientists 415–424 publications: 35 scientists 425–434 publications: 29 scientists 435–444 publications: 33 scientists 445–454 publications: 34 scientists 455–464 publications: 25 scientists 465–474 publications: 26 scientists 475–484 publications: 20 scientists 485–494 publications: 19 scientists 495–504 publications: 16 scientists 505–514 publications: 17 scientists 515–524 publications: 23 scientists 525–534 publications: 14 scientists 535–544 publications: 14 scientists 545–554 publications: 18 scientists 555–564 publications: 12 scientists 565–574 publications: 7 scientists 575–584 publications: 9 scientists 585–594 publications: 9 scientists 595–604 publications: 9 scientists 605–614 publications: 7 scientists 615–624 publications: 9 scientists 625–634 publications: 7 scientists 635–644 publications: 4 scientists 645–654 publications: 5 scientists 655–664 publications: 6 scientists 665–674 publications: 7 scientists 675–678 publications: 3 scientists 679+ publications: 99 scientists
55–64 publications 679+

This scientist: 319 publications — 80th percentile

80% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 679 publications or more.

View publications distribution as a table
Number of Microbiology scientists by publication count, Research.com 2026 ranking edition. Based on 5,513 ranked scientists.
Publications Scientists This scientist
55–64 8
65–74 29
75–84 55
85–94 112
95–104 137
105–114 190
115–124 235
125–134 234
135–144 288
145–154 265
155–164 264
165–174 253
175–184 276
185–194 190
195–204 234
205–214 208
215–224 198
225–234 155
235–244 161
245–254 160
255–264 146
265–274 139
275–284 148
285–294 115
295–304 96
305–314 88
315–324 106 319
325–334 65
335–344 76
345–354 64
355–364 62
365–374 65
375–384 61
385–394 34
395–404 44
405–414 36
415–424 35
425–434 29
435–444 33
445–454 34
455–464 25
465–474 26
475–484 20
485–494 19
495–504 16
505–514 17
515–524 23
525–534 14
535–544 14
545–554 18
555–564 12
565–574 7
575–584 9
585–594 9
595–604 9
605–614 7
615–624 9
625–634 7
635–644 4
645–654 5
655–664 6
665–674 7
675–678 3
679+ 99
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Nicola P. Klein D-index placement in Microbiology in 2026

The chart shows the D-index (discipline H-index) distribution of Microbiology scientists ranked by Research.com in 2026. The highlighted bar marks where Nicola P. Klein sits on this spectrum.

No. of scientists
50 100 150
Bar chart with 88 bars. Horizontal axis: D-Index, 40 to 127+. Vertical axis: number of scientists, 0 to 162. Most scientists, 162, have 58 D-Index. The last bar groups every scientist with 127 D-Index or more. The highlighted bar, 73 D-Index, is where this scientist sits. 40 D-Index: 30 scientists 41 D-Index: 86 scientists 42 D-Index: 90 scientists 43 D-Index: 117 scientists 44 D-Index: 122 scientists 45 D-Index: 123 scientists 46 D-Index: 108 scientists 47 D-Index: 110 scientists 48 D-Index: 106 scientists 49 D-Index: 109 scientists 50 D-Index: 129 scientists 51 D-Index: 111 scientists 52 D-Index: 116 scientists 53 D-Index: 127 scientists 54 D-Index: 134 scientists 55 D-Index: 134 scientists 56 D-Index: 112 scientists 57 D-Index: 136 scientists 58 D-Index: 162 scientists 59 D-Index: 151 scientists 60 D-Index: 139 scientists 61 D-Index: 123 scientists 62 D-Index: 126 scientists 63 D-Index: 144 scientists 64 D-Index: 109 scientists 65 D-Index: 103 scientists 66 D-Index: 124 scientists 67 D-Index: 112 scientists 68 D-Index: 103 scientists 69 D-Index: 131 scientists 70 D-Index: 94 scientists 71 D-Index: 93 scientists 72 D-Index: 96 scientists 73 D-Index: 92 scientists 74 D-Index: 80 scientists 75 D-Index: 66 scientists 76 D-Index: 87 scientists 77 D-Index: 60 scientists 78 D-Index: 73 scientists 79 D-Index: 59 scientists 80 D-Index: 57 scientists 81 D-Index: 55 scientists 82 D-Index: 47 scientists 83 D-Index: 77 scientists 84 D-Index: 50 scientists 85 D-Index: 45 scientists 86 D-Index: 42 scientists 87 D-Index: 41 scientists 88 D-Index: 32 scientists 89 D-Index: 38 scientists 90 D-Index: 35 scientists 91 D-Index: 34 scientists 92 D-Index: 27 scientists 93 D-Index: 26 scientists 94 D-Index: 33 scientists 95 D-Index: 22 scientists 96 D-Index: 37 scientists 97 D-Index: 22 scientists 98 D-Index: 21 scientists 99 D-Index: 22 scientists 100 D-Index: 30 scientists 101 D-Index: 16 scientists 102 D-Index: 20 scientists 103 D-Index: 17 scientists 104 D-Index: 19 scientists 105 D-Index: 16 scientists 106 D-Index: 19 scientists 107 D-Index: 18 scientists 108 D-Index: 14 scientists 109 D-Index: 10 scientists 110 D-Index: 9 scientists 111 D-Index: 7 scientists 112 D-Index: 11 scientists 113 D-Index: 6 scientists 114 D-Index: 15 scientists 115 D-Index: 10 scientists 116 D-Index: 12 scientists 117 D-Index: 7 scientists 118 D-Index: 10 scientists 119 D-Index: 10 scientists 120 D-Index: 11 scientists 121 D-Index: 2 scientists 122 D-Index: 7 scientists 123 D-Index: 12 scientists 124 D-Index: 5 scientists 125 D-Index: 9 scientists 126 D-Index: 6 scientists 127+ D-Index: 95 scientists
40 D-Index 127+

This scientist: 73 D-Index — 71st percentile

71% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 127 D-Index or more.

View D-Index distribution as a table
Number of Microbiology scientists by D-index, Research.com 2026 ranking edition. Based on 5,513 ranked scientists.
D-Index Scientists This scientist
40 30
41 86
42 90
43 117
44 122
45 123
46 108
47 110
48 106
49 109
50 129
51 111
52 116
53 127
54 134
55 134
56 112
57 136
58 162
59 151
60 139
61 123
62 126
63 144
64 109
65 103
66 124
67 112
68 103
69 131
70 94
71 93
72 96
73 92 73
74 80
75 66
76 87
77 60
78 73
79 59
80 57
81 55
82 47
83 77
84 50
85 45
86 42
87 41
88 32
89 38
90 35
91 34
92 27
93 26
94 33
95 22
96 37
97 22
98 21
99 22
100 30
101 16
102 20
103 17
104 19
105 16
106 19
107 18
108 14
109 10
110 9
111 7
112 11
113 6
114 15
115 10
116 12
117 7
118 10
119 10
120 11
121 2
122 7
123 12
124 5
125 9
126 6
127+ 95
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Overview

Nicola P. Klein is affiliated with Kaiser Permanente in the United States and has an extensive publication record in the field of medicine, with a strong emphasis on epidemiology, infectious diseases, and vaccine-related research. Their work primarily investigates vaccine coverage, hesitancy, and the effectiveness of vaccines against various respiratory infections, including SARS-CoV-2 and influenza viruses.

Klein's research spans multiple subfields, including epidemiology, infectious diseases, health, obstetrics and gynecology, and surgery. Their main areas of focus include:

  • Vaccine Coverage and Hesitancy
  • SARS-CoV-2 and COVID-19 Research
  • Respiratory Viral Infections Research
  • Influenza Virus Research Studies
  • Pneumonia and Respiratory Infections
  • COVID-19 Clinical Research Studies
  • COVID-19 Impact on Reproduction

The scientist has contributed to leading journals and frequent publication venues such as:

  • Vaccine
  • MMWR Morbidity and Mortality Weekly Report
  • Open Forum Infectious Diseases
  • JAMA Network Open
  • PEDIATRICS

Klein has collaborated often with several researchers, including:

  • Ousseny Zerbo
  • Bruce Fireman
  • Allison L. Naleway
  • Kristin Goddard
  • Stephanie A. Irving

Some of Klein's recent papers highlight important topics within COVID-19 vaccine research and vaccine safety:

  • Safety, Immunogenicity, and Efficacy of the BNT162b2 Covid-19 Vaccine in Adolescents (2021), published in New England Journal of Medicine
  • Surveillance for Adverse Events After COVID-19 mRNA Vaccination (2021), published in JAMA
  • Effectiveness of Covid-19 Vaccines in Ambulatory and Inpatient Care Settings (2021), published in New England Journal of Medicine
  • Waning 2-Dose and 3-Dose Effectiveness of mRNA Vaccines Against COVID-19-Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Adults During Periods of Delta and Omicron Variant Predominance - VISION Network, 10 States, August 2021-January 2022 (2022), published in MMWR Morbidity and Mortality Weekly Report
  • Effectiveness of a Third Dose of mRNA Vaccines Against COVID-19-Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Adults During Periods of Delta and Omicron Variant Predominance - VISION Network, 10 States, August 2021-January 2022 (2022), published in MMWR Morbidity and Mortality Weekly Report

Best Publications

  • Safety, Immunogenicity, and Efficacy of the BNT162b2 Covid-19 Vaccine in Adolescents.

    Robert W Frenck;Nicola P Klein;Nicholas Kitchin;Alejandra Gurtman

  • Effectiveness of a Third Dose of mRNA Vaccines Against COVID-19–Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Adults During Periods of Delta and Omicron Variant Predominance — VISION Network, 10 States, August 2021–January 2022

    Unknown

  • Waning Protection after Fifth Dose of Acellular Pertussis Vaccine in Children

    Nicola P. Klein;Joan Bartlett;Ali Rowhani-Rahbar;Bruce Fireman

  • Surveillance for Adverse Events After COVID-19 mRNA Vaccination.

    Nicola P Klein;Ned Lewis;Kristin Goddard;Bruce Fireman

  • Effectiveness of Covid-19 Vaccines in Ambulatory and Inpatient Care Settings.

    Mark G Thompson;Edward Stenehjem;Shaun Grannis;Sarah W Ball

  • Risk of anaphylaxis after vaccination in children and adults

    Michael M. McNeil;Eric S. Weintraub;Jonathan Duffy;Lakshmi Sukumaran

  • Measles-Mumps-Rubella-Varicella Combination Vaccine and the Risk of Febrile Seizures

    Nicola P. Klein;Bruce Fireman;W. Katherine Yih;Edwin Lewis

  • The Vaccine Safety Datalink: A Model for Monitoring Immunization Safety

    James Baggs;Julianne Gee;Edwin Lewis;Gabrielle Fowler

  • Effectiveness of COVID-19 Pfizer-BioNTech BNT162b2 mRNA Vaccination in Preventing COVID-19–Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Nonimmunocompromised Children and Adolescents Aged 5–17 Years — VISION Network, 10 States, April 2021–January 2022

    Unknown

  • Monitoring the safety of quadrivalent human papillomavirus vaccine: findings from the Vaccine Safety Datalink.

    Julianne Gee;Allison Naleway;Irene Shui;James Baggs

  • Waning of vaccine effectiveness against moderate and severe covid-19 among adults in the US from the VISION network: test negative, case-control study

    Unknown

  • Surveillance of autoimmune conditions following routine use of quadrivalent human papillomavirus vaccine

    C. Chao;N.P. Klein;C.M. Velicer;L.S. Sy

  • Risk of Intussusception after Monovalent Rotavirus Vaccination

    Eric S. Weintraub;James Baggs;Jonathan Duffy;Claudia Vellozzi

  • The Vaccine Safety Datalink: successes and challenges monitoring vaccine safety

    Michael M. McNeil;Julianne Gee;Eric S. Weintraub;Edward A. Belongia

  • Geographic Clusters in Underimmunization and Vaccine Refusal

    Tracy A. Lieu;G. Thomas Ray;Nicola P. Klein;Cindy Chung

  • Comparative Effectiveness of Acellular Versus Whole-Cell Pertussis Vaccines in Teenagers

    Nicola P. Klein;Joan Bartlett;Bruce Fireman;Ali Rowhani-Rahbar

  • Evaluation of the Association of Maternal Pertussis Vaccination With Obstetric Events and Birth Outcomes

    Elyse O. Kharbanda;Gabriela Vazquez-Benitez;Heather S. Lipkind;Nicola P. Klein

  • Effectiveness of Vaccination During Pregnancy to Prevent Infant Pertussis

    Roger Baxter;Joan Bartlett;Bruce Fireman;Edwin Lewis

  • Multisystem inflammatory syndrome in children and adults (MIS-C/A): Case definition & guidelines for data collection, analysis, and presentation of immunization safety data.

    Tiphanie P. Vogel;Karina A. Top;Christos Karatzios;David C. Hilmers

  • Use of COVID-19 Vaccines After Reports of Adverse Events Among Adult Recipients of Janssen (Johnson & Johnson) and mRNA COVID-19 Vaccines (Pfizer-BioNTech and Moderna): Update from the Advisory Committee on Immunization Practices - United States, July 2021.

    Hannah G. Rosenblum;Stephen C. Hadler;Danielle Moulia;Tom T. Shimabukuro

  • Influenza Vaccine Effectiveness in Preventing Influenza-associated Hospitalizations During Pregnancy: A Multi-country Retrospective Test Negative Design Study, 2010-2016

    Mark G Thompson;Jeffrey C Kwong;Annette K Regan;Annette K Regan;Mark A Katz;Mark A Katz;Mark A Katz

  • Risk of Intussusception Following Administration of a Pentavalent Rotavirus Vaccine in US Infants

    Irene M. Shui;James Baggs;Manish Patel;Umesh D. Parashar

  • Geographic Clusters in Underimmunization and Vaccine

    Refusal A. Lieu;G. Thomas Ray;Nicola P. Klein;Cindy Chung

Frequent Co-Authors

Allison L. Naleway
Allison L. Naleway Kaiser Permanente
Roger Baxter
Roger Baxter Kaiser Permanente
Bruce Fireman
Bruce Fireman Kaiser Permanente
Lisa A. Jackson
Lisa A. Jackson Kaiser Permanente
Edwin Lewis
Edwin Lewis University of Idaho
Frank DeStefano
Frank DeStefano Centers for Disease Control and Prevention
Ousseny Zerbo
Ousseny Zerbo Kaiser Permanente
Steven J. Jacobsen
Steven J. Jacobsen Kaiser Permanente
Edward A. Belongia
Edward A. Belongia Marshfield Clinic
Saad B. Omer
Saad B. Omer The University of Texas Southwestern Medical Center

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