Shift of the 2009–2011 measles outbreak from children to adults: an observational review at the University Hospital of Clermont-Ferrand, France

In 2009–2011, 113 adult in- and outpatients with measles were referred to the University Hospital of Clermont-Ferrand (centre of France): 71 (62.8 %) needed hospitalisation, 31 had pneumonia, 29 diarrhoea, 47 liver enzymes elevation, 38 thrombopaenia, one encephalitis and there were no deaths. Nineteen cases occurred among healthcare workers and five of them were hospital-acquired. There were 92 unvaccinated patients. The 2011 peak of that measles re-emerging epidemic occurred when non-immunised adults were affected.