Imperial College London


Faculty of MedicineSchool of Public Health

Senior Lecturer in Bacterial Genomics



+44 (0)20 7594 3820n.croucher




UG5Norfolk PlaceSt Mary's Campus





I am a Sir Henry Dale fellow in the Bacterial Evolutionary Epidemiology group at the MRC Centre for Global Infectious Disease Analysis, near Paddington. My work focusses on the biology of multi-strain bacterial populations, primarily Streptococcus pneumoniae (the pneumococcus). Such microbes often vary extensively in characteristics such as antibiotic resistance, virulence and expression of antigens that are potential vaccine targets. To understand this variation, my research encompasses laboratory molecular microbiology, analysis of genomic datasets, and computational modelling. Repeated emails are the best way to contact me.



Croucher N, Joshua D, 2021, The role of interspecies recombinations in the evolution of antibiotic-resistant pneumococci, Elife, ISSN:2050-084X

Croucher N, Harrow G, Lees J, et al., 2021, Negative frequency-dependent selection and asymmetrical transformation stabilise multi-strain bacterial population structures, The Isme Journal: Multidisciplinary Journal of Microbial Ecology, Vol:15, ISSN:1751-7362, Pages:1523-1538

Lochen A, Croucher N, Anderson R, 2020, Divergent serotype replacement trends and increasing diversity in pneumococcal disease in high income settings reduce the benefit of expanding vaccine valency, Scientific Reports, Vol:10, ISSN:2045-2322

Azarian T, Martinez PP, Arnold BJ, et al., 2020, Frequency-dependent selection can forecast evolution in Streptococcus pneumoniae, Plos Biology, Vol:18, ISSN:1544-9173

Zamudio R, Haigh RD, Ralph JD, et al., 2020, Lineage-specific evolution and gene flow inListeria monocytogenesare independent of bacteriophages, Environmental Microbiology, Vol:22, ISSN:1462-2912, Pages:5058-5072

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