Health bosses have warned Solihull could be on the verge of a measles outbreak, because not enough people are immunised against the disease.
New figures calculated by the Health Protection Agency show that the borough faces the greatest risk in the West Midlands of an outbreak.
The reproduction rate measures how many people each person with measles will infect on average.
If it is much lower than 1.0 the number infected will diminish over time, around 1.0 means it will continue to be passed on within the community, while anything above 1.0 meansan epidemic is likely.
Solihull’s R figure is 0.952 - the highest value anywhere in the West Midlands.
Solihull NHS Care Trust has launched a catch-up campaign to boost immunisation levels with parents of children aged under 18, who are not up to date with the MMR (measles, mumps and rubella) vaccination, being invited to see their GP to have the jab.