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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Research shows more than two billion nuisance calls were made last year, the majority to people aged over 65.
Cold and windy with sunny spells and occasional wintry showers.
Sunny spells and blustery showers on Tuesday.