Dr David Kirrage from Public Health England says the risk that any child has caught an infection is "negligible", and they and Moreton School in Wolverhampton are working to reassure parents, after 20 pupils were jabbed with a diabetic testing needle.
Read more here.
More top news
The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.
Mostly cloudy tonight. Brighter with warm sunny spells tomorrow.
Another dry day with sunny periods, becoming locally very warm.