1. DO Freedman et al. 'Medical Considerations before International Travel'. N Engl J Med. July 21, 2016. 375;3. http://www.nejm.org/doi/pdf/10.1056/NEJMra1508815

2. Public Health England. Collection - Immunisation against infectious disease ('Green Book'). Accessed March 2017. https://www.gov.uk/government/collections/immunisation-against-infectious-disease-the-green-book

3. NHS Choices. Travel vaccination. Accessed March 2017. http://www.nhs.uk/Conditions/Travel-immunisation/Pages/Introduction.aspx

4. NHS Choices. Vaccinations - When to have vaccinations. Accessed March 2017. http://www.nhs.uk/Conditions/vaccinations/Pages/vaccination-schedule-age-checklist.aspx

5. eMC. Summaries of Product Characteristics. Accessed March 2017. http://www.medicines.org.uk/emc/

6. NHS Choices. Diphtheria. Accessed March 2017 http://www.nhs.uk/Conditions/Diphtheria/Pages/Introduction.aspx

7. NHS Choices. Tetanus. Accessed March 2017. http://www.nhs.uk/Conditions/tetanus/Pages/Introduction.aspx

8. NHS Choices. Typhoid fever. Accessed March 2017. http://www.nhs.uk/Conditions/Typhoid-fever/Pages/Introduction.aspx

9. NHS Choices. Cholera. Accessed March 2017. http://www.nhs.uk/Conditions/Cholera/Pages/Definition.aspx

10. NHS Choices. Men ACWY Vaccine. Accessed March 2017. http://www.nhs.uk/Conditions/vaccinations/Pages/men-acwy-vaccine.aspx

11. NHS Choices. Vaccination. Who should have the BCG(TB) vaccine? Accessed March 2017. http://www.nhs.uk/Conditions/vaccinations/Pages/when-is-bcg-tb-vaccine-needed.aspx

12. NHS Choices. Polio. Accessed March 2017. http://www.nhs.uk/Conditions/polio/Pages/Introduction.aspx

13. NHS Choices. hepatitis A vaccination. Accessed March 2017. http://www.nhs.uk/Conditions/Hepatitis-A/Pages/Vaccination.aspx

14. NHS Choices. Hepatitis B vaccine. Accessed March 2017. http://www.nhs.uk/Conditions/vaccinations/Pages/hepatitis-b-vaccine.aspx

15. NHS Choices. Japanese encephalitis. Accessed March 2017. http://www.nhs.uk/Conditions/Japanese-encephalitis/Pages/Introduction.aspx

16. NHS Choices. Tick-borne encephalitis. Accessed March 2017. http://www.nhs.uk/Conditions/Tick-borne-encephalitis/Pages/Introduction.aspx

17. NHS Choices. Rabies. Accessed March 2017. http://www.nhs.uk/Conditions/Rabies/Pages/Introduction.aspx

18. NHS Choices. Yellow fever. Accessed March 2017. http://www.nhs.uk/conditions/Yellow-fever/Pages/Introduction.aspx

19. R Steffen et al. 'Vaccine-Preventable Travel Health Risks: What Is the Evidence€”What Are the Gaps?'. J Travel Med. 2015 Jan-Feb; 22(1):1-12. http://onlinelibrary.wiley.com/doi/10.1111/jtm.12171/full

20. P Ljungman. 'Vaccination of immunocompromised patients'. Clin Microbiol Infect. 2012 Oct; 18 Suppl 5:93-9.https://linkinghub.elsevier.com/retrieve/pii/S1198-743X(14)61367-7

21. Polio Global Eradication Initiative. Accessed March 2017. http://polioeradication.org/where-we-work/polio-endemic-countries/

22. European Medicines Agency. Press release. 'First malaria vaccine receives positive scientific opinion from EMA'. 24 July 2015. Accessed March 2017. http://www.ema.europa.eu/ema/index.jsp?curl=pages/news_and_events/news/2015/07/news_detail_002376.jsp&mid=WC0b01ac058004d5c1

23. WHO. Immunization, Vaccines and Biologicals. Questions and answers on RTS,S/ASO1 malaria vaccine. Last update: 22 November 2016. Accessed March 2017. http://www.who.int/immunization/research/development/malaria_vaccine_qa/en/

24. NHS Choices. Cover your healthcare abroad. Accessed March 2017. http://www.nhs.uk/NHSEngland/Healthcareabroad/Pages/Healthcareabroad.aspx

25. fitfortravel - Travel health information for people travelling abroad from the UK. Accessed March 2017. http://www.fitfortravel.nhs.uk/home.aspx

26. Travel Health Pro. Accessed March 2017. http://travelhealthpro.org.uk/about

27. Yellow Fever Zone. Accessed March 2017. http://nathnacyfzone.org.uk/

28. GOV.UK. Foreign travel advice. Accessed March 2017. https://www.gov.uk/foreign-travel-advice

29. The National Pharmacy Association. Press release. 'The NPA travel vaccine resources have been updated'. 13 October 2016. Accessed March 2017. https://www.npa.co.uk/news-and-events/news-item/npa-travel-vaccine-resources/

30 NHS England, News. 'NHS England to issue new guidance on low value prescription items'. 28 March 2017. https://www.england.nhs.uk/2017/03/guidance-on-low-value-prescription-items/

31. Numark. Accessed March 2017. https://www.numarknet.com/