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.
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It will be a breezy, but still a rather cloudy day across the region with intermittent drizzle possible.
Remaining cloudy but with a freshening southeasterly breeze helping to clear much of the mist and hill fog.
Another cloudy and murky night with extensive low cloud giving hill fog and some patchy light rain or drizzle.