The last of two vaccination sessions for measles will take place at Devizes School on Friday.
Two cases were confirmed and a number of others are suspected at the school.
Immunisation against measles, mumps and rubella is also open to pupils' families.
The first session was held on Wednesday.
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Free jabs are available to pregnant women and pensioners.
James Wright has the forecast for Devon, Cornwall, Somerset and Dorset.
James Wright has the forecast for Bristol, Wiltshire, Somerset, Dorset and Gloucestershire.