1. Interim- Public Health Operational Guidelines for Typhoid and Paratyphoid (Enteric Fever): A joint guideline from Public Health England and the Chartered Institute of Environmental Health. Public Heath England; 2017 March 2017.
2. PHE. Immunisation against infectious disease: Chapter 33 Typhoid: Department of Health,UK; 2013.
3. NaTHNaC. Typhoid Fever https://travelhealthpro.org.uk/disease/184/typhoid-fever2021.
4. PHE. Enteric Fever (typhoid and paratyphoid) England, Wales and Northern Ireland: 2017. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/761348/Enteric_fever_annual_report_2017.pdf Public Health England; 2017.
5. GRADE: an emerging consensus on rating quality of evidence and strength of recommendations;Guyatt;BMJ,2008