Campaigners will hand a petition to Downing Street later calling for meningitis vaccinations to be given earlier and to more people.
The action marks the start of Meningitis Awareness Week, which aims to increase awareness of the illness and its symptoms.
Lucy Green from Cardiff contracted meningitis when she was a student, but she didn't realise how ill she was.
The Meningitis Research Foundation says meningitis and septicaemia affect around 3,600 people in Great Britain every year.
The diseases can strike anyone without warning, killing one in ten and leaving a quarter of survivors with life-altering after-effects ranging from deafness and brain damage to loss of limbs.
Mariclare Carey-Jones has the full report: