Why is this meningitis outbreak so explosive? - BBC

1. Why is this meningitis outbreak so explosive?  BBC
2. Urgent public health alert as Kent meningitis outbreak grows  BBC
3. Number of meningitis cases investigated in Kent rises to 20  The Guardian
4. 20 Sickened, 2 Dead in ‘Explosive’ and 'Unprecedented' Meningitis Outbreak Sweeping Through a University Town  People.com
5. UK races to contain meningitis outbreak in Kent after two deaths  Reuters