| * | Immunisation against typhoid may be less important for short stays in 1st class conditions. This list is correct at the time and date of publication. |
| E | Immunisation is an essential requirement for entry to the country concerned and you will require a certificate. |
| E1 | Immunisation essential except for infants under one year (but note the advice above). |
| E2 | Immunisation essential (except for infants under one year) unless arriving from non-infected areas and staying for less than two weeks. The UK is a non-infected area, but if travelling via equatorial Africa or South America, seek medical advice. |
| E3 | Immunisation essential if the traveller arrives from an infected country or area (this will not apply if your journey is direct from the UK). The lower age limit varies. |
| E4 | Immunisation essential if arriving within 6 days of having visited an infected country. |
| R | Immunisation or tablets recommended for protection against disease, but note that for Yellow Fever pregnant women and infants under nine months should not normally be immunised and therefore should avoid exposure to infection. |
| D | Check immunised against diphtheria. |
| M | Meningitis, depending on area visited and time of year. |
| A | Depends on area visited. |
