Nicholas C. Grassly

16.8k citations

124 papers · 5.6k indexed · 2 hit papers · h-index 42

Modeling and Simulation top 0.2%
Infectious Diseases top 0.5%
- Viral gastroenteritis research and epidemiology 66
- SARS-CoV-2 and COVID-19 Research 23
- HIV/AIDS Research and Interventions 11
Cardiology and Cardiovascular Medicine top 1%
- Viral Infections and Immunology Research 60
Microbiology top 1%
- Reproductive tract infections research 10
Agronomy and Crop Science top 1%
- Animal Disease Management and Epidemiology 20
Epidemiology
- Respiratory viral infections research 18
Economics and Econometrics
- HIV/AIDS Impact and Responses 10

Co-authors: Christophe Fraser Edward P K Parker Margarita Pons-Salort R. Bruce Aylward Edward C. Holmes Roland W. Sutter Thomas R. Hird Geoffrey P. Garnett
Cited by: Modeling and Simulation Infectious Diseases Cardiology and Cardiovascular Medicine
Partner nations: United Kingdom United States Switzerland

In The Last Decade

Nicholas C. Grassly

119 papers receiving 5.3k citations

Hit Papers

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What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

2020 Estimating the effects of non-pharmaceutical interventions on COVID-19 in Europe
2008 Mathematical models of infectious disease transmission

Peers

Countries citing papers authored by Nicholas C. Grassly

Since Specialization

Citations

This map shows the geographic impact of Nicholas C. Grassly's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Nicholas C. Grassly with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Nicholas C. Grassly more than expected).

Fields of papers citing papers by Nicholas C. Grassly

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Nicholas C. Grassly. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Nicholas C. Grassly. The network helps show where Nicholas C. Grassly may publish in the future.

Co-authorship network

The 25 scholars most cited alongside Nicholas C. Grassly, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with Nicholas C. Grassly Line = papers co-authored together Nicholas C. Grassly links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

#	Work
1	A novel approach for estimating vaccine efficacy for infections with multiple outcomes: application to a COVID-19 vaccine trial Lucy R Williams,Merryn Voysey,Andrew J. Pollard,Nicholas C. Grassly	2025	0
2	Evaluation of Moore and grab sampling method for Salmonella Typhi detection in environmental samples in Ghana Michael Owusu,Eric Darko,Debora Akortia,Gifty Nkrumah,Sampson Twumasi-Ankrah,Michael Owusu-Ansah,Christopher B. Uzzell,Jonathan Rigby,Catherine Troman,Nicolette A. Zhou,John Scott Meschke,Alex Shaw,Nicholas C. Grassly,Yaw Adu‐Sarkodie,Ellis Owusu‐Dabo	2025	0
3	Wastewater surveillance for Salmonella Typhi and its association with seroincidence of enteric fever in Vellore, India Dilip Abraham,Lalithambigai Kathiresan,Midhun Sasikumar,Kristen Aiemjoy,Richelle C. Charles,Dilesh Kumar,Rajan Srinivasan,Catherine Troman,Elizabeth Gray,Christopher B. Uzzell,Jacob John,Balaji Veeraraghavan,Nicholas C. Grassly,Venkata Raghava Mohan	2025	1
4	Automated detection and classification of polioviruses from nanopore sequencing reads using piranha Áine O’Toole,Rachel Colquhoun,Corey Ansley,Catherine Troman,Daniel Maloney,Zoe Vance,Joyce Akello,Erika Bujáki,Manasi Majumdar,Adnan Khurshid,Yasir Arshad,Muhammad Masroor Alam,Javier Martín,Alex Shaw,Nicholas C. Grassly,Andrew Rambaut	2024	2
5	Implementation and adherence to regular asymptomatic testing in a COVID-19 vaccine trial Lucy R Williams,Katherine R. W. Emary,Daniel J. Phillips,Jodie Hay,Jessica P. J. Larwood,Maheshi Ramasamy,Andrew J. Pollard,Nicholas C. Grassly,Merryn Voysey	2024	1
6	Comparison of Eleven RNA Extraction Methods for Poliovirus Direct Molecular Detection in Stool Samples Joyce Akello,Erika Bujáki,Alex Shaw,Adnan Khurshid,Yasir Arshad,Catherine Troman,Manasi Majumdar,Áine O’Toole,Andrew Rambaut,Muhammad Masroor Alam,Javier Martín,Nicholas C. Grassly	2023	6
7	Environmental Surveillance for Salmonella Typhi and its Association With Typhoid Fever Incidence in India and Malawi Christopher B. Uzzell,Dilip Abraham,Jonathan Rigby,Catherine Troman,Satheesh Nair,Nicola Elviss,Lalithambigai Kathiresan,Rajan Srinivasan,Balaji Veeraraghavan,Nicolette A. Zhou,John Scott Meschke,Jacob John,Gagandeep Kang,Nicholas Feasey,Venkata Raghava Mohan,Nicholas C. Grassly	2023	16
8	The Origins and Risk Factors for Serotype-2 Vaccine-Derived Poliovirus Emergences in Africa During 2016–2019 Elizabeth Gray,Laura Cooper,Ananda S Bandyopadhyay,Isobel M. Blake,Nicholas C. Grassly	2023	7
9	Changes in transmission of Enterovirus D68 (EV-D68) in England inferred from seroprevalence data Margarita Pons-Salort,Ben Lambert,Everlyn Kamau,Richard Pebody,Heli Harvala,Peter Simmonds,Nicholas C. Grassly	2023	10
10	Measuring Vaccine Efficacy Against Infection and Disease in Clinical Trials: Sources and Magnitude of Bias in Coronavirus Disease 2019 (COVID-19) Vaccine Efficacy Estimates Lucy R Williams,Neil M. Ferguson,Christl A. Donnelly,Nicholas C. Grassly	2021	5
11	Salmonella Typhi Shedding and Household Transmission by Children With Blood Culture-Confirmed Typhoid Fever in Vellore, South India Manikandan Srinivasan,Kulandaipalayam Natarajan Sindhu,Sidhartha Giri,Nirmal Kumar,Venkata Raghava Mohan,Nicholas C. Grassly,Gagandeep Kang	2021	13
12	Factors Predicting Blood Culture Positivity in Children With Enteric Fever Manikandan Srinivasan,Kulandaipalayam Natarajan Sindhu,Karthikeyan Ramanujam,Ranjith Kumar Ramasamy,Sathyapriya Subramaniam,Santhosh Kumar Ganesan,Swathi Vajja,Anita Shirley David,Pramitha Lankala,Winsley Rose,Prabhakar D. Moses,Nicholas C. Grassly,Gagandeep Kang,Jacob John	2021	5
13	Evolving epidemiology of poliovirus serotype 2 following withdrawal of the serotype 2 oral poliovirus vaccine Grace Macklin,Kathleen O’Reilly,Nicholas C. Grassly,W. John Edmunds,Ondrej Mach,R. Santhana Gopala Krishnan,Arie Voorman,John Vertefeuille,J. Abdelwahab,Nicksy Gumede,Ajay Kumar Goel,Stephen Sosler,John L. Sever,Ananda S Bandyopadhyay,Mark A. Pallansch,Robin Nandy,Pascal Mkanda,Ousmane M. Diop,Roland W. Sutter	2020	87
14	Immune predictors of oral poliovirus vaccine immunogenicity among infants in South India Sudhir Babji,Punithavathy Manickavasagam,Yin‐Huai Chen,Nithya Jeyavelu,Nisha Jose,Ira Praharaj,Chanduni Syed,Saravanakumar Puthupalayam Kaliappan,Jacob John,Sidhartha Giri,Srinivasan Venugopal,Beate Kampmann,Edward P K Parker,Miren Iturriza‐Gómara,Gagandeep Kang,Nicholas C. Grassly,Holm H. Uhlig	2020	3
15	Routine immunization in Pakistan: comparison of multiple data sources and identification of factors associated with vaccination Hafsa Imran,D. de S. Rajã,Nicholas C. Grassly,Mufti Zubair Wadood,Rana M. Safdar,Kathleen O’Reilly	2018	35
16	Population Immunity against Serotype-2 Poliomyelitis Leading up to the Global Withdrawal of the Oral Poliovirus Vaccine: Spatio-temporal Modelling of Surveillance Data Margarita Pons-Salort,Natalie A. Molodecky,Kathleen O’Reilly,Mufti Zubair Wadood,Rana M. Safdar,Andrew Etsano,Rui G. Vaz,Hamid Jafari,Nicholas C. Grassly,Isobel M. Blake	2016	18
17	Efficacy of inactivated poliovirus vaccine in India Hamid Jafari,Jagadish M. Deshpande,Roland W. Sutter,Sunil Bahl,Harish Verma,M. Ridwan Said Ahmad,Abhishek Kunwar,Rakesh Vishwakarma,Ashutosh Agarwal,Shilpi Jain,Concepción F. Estívariz,Raman Sethi,Natalie A. Molodecky,Nicholas C. Grassly,Mark A. Pallansch,A. Chatterjee,(unknown)	2014	90
18	Influence of Enteric Infections on Response to Oral Poliovirus Vaccine: A Systematic Review and Meta-analysis Edward P K Parker,Beate Kampmann,Gagandeep Kang,Nicholas C. Grassly	2014	56
19	Context‐dependent amphibian host population response to an invading pathogen Benjamin J. Doddington,Jaime Bosch,Joan Antoni Oliver,Nicholas C. Grassly,Gerardo García,Benedikt R. Schmidt,Trenton W. J. Garner,Matthew C. Fisher	2013	60
20	Trachoma: transmission, infection, and control Manoj Gambhir,María‐Gloria Basáñez,Felicity Turner,Jacob Kumaresan,Nicholas C. Grassly	2007	43

About Nicholas C. Grassly

Nicholas C. Grassly is a scholar working on Infectious Diseases, Cardiology and Cardiovascular Medicine and Agronomy and Crop Science, having authored 124 papers that have together received 5.6k indexed citations. Recurring topics across this work include Viral gastroenteritis research and epidemiology (66 papers), Viral Infections and Immunology Research (60 papers), SARS-CoV-2 and COVID-19 Research (23 papers), Animal Disease Management and Epidemiology (20 papers), Respiratory viral infections research (18 papers), HIV/AIDS Research and Interventions (11 papers), Reproductive tract infections research (10 papers) and HIV/AIDS Impact and Responses (10 papers). The work is most often cited by research in Modeling and Simulation (857 citations), Infectious Diseases (2.8k citations) and Cardiology and Cardiovascular Medicine (1.7k citations). Nicholas C. Grassly has collaborated with scholars based in United Kingdom, United States and Switzerland. Frequent co-authors include Christophe Fraser, Edward P K Parker, Margarita Pons-Salort, R. Bruce Aylward, Edward C. Holmes, Roland W. Sutter, Thomas R. Hird, Geoffrey P. Garnett, Jacob John and Gagandeep Kang.

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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