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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Persistent and heavy rain will arrive during the morning, clearing in the afternoon to leave colder brighter weather for the end of the day.
Cloudy with rain, heavy for a time, around the middle of the day. Brighter and colder with isolated showers later. Strong winds throughout.
Cloudy, breezy and dry overnight. Becoming colder later this week.