Why crowds matter more than countries
Meningococcal disease is caused by a bacterium that lives harmlessly in the nose and throat of around one person in ten. It passes between people in respiratory droplets - coughing, sneezing, sharing a glass, kissing. Occasionally, and for reasons still not fully understood, it invades the bloodstream and the lining of the brain.
When it does, it moves fast. Meningitis and septicaemia can go from the first symptom to critical illness within hours, and survivors can be left with deafness, amputations or brain injury. That speed is why this is a vaccine-first disease: there is rarely time to react.
Crowding is the risk factor that matters. Mass gatherings, dormitories, pilgrimage - anywhere a lot of people breathe the same air for days. The destination matters less than the conditions once you are there.
Hajj and Umrah: what the visa requires
Saudi Arabia requires proof of MenACWY vaccination for pilgrims, given not less than ten days before arrival, and the certificate is checked as part of the visa process. Requirements are set each year by the Saudi Ministry of Health and can change between seasons.
We give the vaccine and issue the certificate at the same appointment. Two practical points worth more than any amount of general advice: get it done early rather than in the fortnight before departure, and check the current year's requirements, because they are revised and we will go through the latest position with you.
The meningitis belt and its season
A band of sub-Saharan Africa from Senegal through to Ethiopia sees regular meningococcal epidemics in the dry season, roughly December to June, when dusty air and harmattan winds damage the lining of the nose and throat.
If your trip falls in that window and takes you into the belt, this vaccine is firmly on the table - more so for longer stays, local transport and staying with families rather than in hotels.
What a UK teenage dose does not cover
MenACWY has been given to UK teenagers since 2015. If you had it at school it may still be within its roughly five-year window, and we can often count it - bring the record.
Two things it does not cover. It is not the MenB vaccine, which protects against a different group and is on the infant schedule; and it is not the MenC vaccine some adults had as children, which covers only one of the four groups. We will work out what you have actually had rather than assume.