Imperial College London


Faculty of MedicineDepartment of Infectious Disease

Professor of Paediatric Infectious Diseases



+44 (0)20 7594 3359p.langford Website




236Wright Fleming WingSt Mary's Campus





The research in my group focuses on respiratory and/or meningitis-causing pathogens of man, e.g. Neisseria meningitidis, Haemophilus influenzae and Mycobacterium tuberculosis, and animals e.g. Actinobacillus pleuropneumoniae (APP), Haemophilus parasuis, Pasteurella multocida. Dependent on the pathogen, the aims are to improve vaccines, diagnostics, therapeutics and a greater understanding of the basis of bacterial pathogenicity. A major focus of our work is on the pig pathogen APP carried out in collaboration with Professor Andrew Rycroft (Royal Veterinary College London). We have developed high throughput genome wide mutagenesis protocols and screens (based on Transposon Directed Insertion site Sequencing [TraDIS]) to identify APP genes essential for growth in vitro and in vivo, with a view to developing novel antimicrobial and vaccine strategies. The methods developed are applicable to other pathogenic members of the Pasteurellaceae i.e. Aggregatibacter actinomycetemcomitans, H. influenzae, Mannheimia haemolytica, and P. multocida.

In collaboration with Dr Anastasia Callaghan (University of Portsmouth) and Professor Denise Bazzolli (University of Viçosa, Brazil) we are evaluating whether inhibition of sRNAs of APP is a viable control strategy. Other collaborations include that with the UK Animal and Plant Health Agency (APHA) and the Wellcome Trust Sanger Centre, where we have identified in APP (1) plasmid borne dfr14 genes (mediating resistance to trimethoprim), the first description in any member of the Pasteurellaceae; and (2) sequenced plasmids mediating florfenicol resistance and ampicillin. Additionally, in a collaboration involving Drs Ee (National University of Singapore) and Yang (Institute of Bioengineering and Nanotechnology, Singapore), and Drs Sandra Newton and Brian Robertson (Imperial College London), rationally designed antimicrobial peptides are being tested for their efficacy in vitro and in vivo to inhibit M. tuberculosis

In addition, we are seeking vaccine candidates that will prevent disease caused by Neisseria meningitidis serogroup B infections. Monoclonal antibodies are derived from patients recovering from meningococcal disease, and the proteins recognised on the surface of the bacterium determined.



Cohen LM, Bossé JT, Stegger M, et al., 2021, Comparative genome sequence analysis of actinobacillus pleuropneumoniae serovar 8 isolates from Norway, Denmark, and the United Kingdom indicates distinct phylogenetic lineages and differences in distribution of antimicrobial resistance genes, Frontiers in Microbiology, Vol:12, ISSN:1664-302X, Pages:1-13

Stringer O, Bosse J, Lacoutre S, et al., 2021, Rapid detection and typing of Actinobacillus pleuropneumoniae serovars directly from clinical samples: combining FTA® card technology with multiplex-PCR, Frontiers in Veterinary Science, Vol:8, ISSN:2297-1769, Pages:1-9

Langford P, Stringer O, Li Y, et al., 2021, Application of the MISTEACHING(S) disease susceptibility framework to Actinobacillus pleuropneumoniae to identify research gaps: an exemplar of a veterinary pathogen, Animal Health Research Reviews, ISSN:1466-2523

Bao C, Liu B, Zhu R, et al., 2021, IFN-gamma(-/-) Mice Resist Actinobacillus pleuropneumoniae Infection by Promoting Early Lung IL-18 Release and PMN-I Accumulation, Infection and Immunity, Vol:89, ISSN:0019-9567

Stringer O, Bosse J, Lacouture S, et al., 2021, Proposal of Actinobacillus pleuropneumoniae serovar 19, and reformulation of previous multiplex PCRs for capsule-specific typing of all known serovars, Veterinary Microbiology, Vol:255, ISSN:0378-1135

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