SMVN ¦ Mumps outbreak in Lothian 2017

12 December 2017


NHS Lothian are currently seeing marked increase in clinical notifications and  positive PCR laboratory reports for mumps virus.  There have been over 150 cases since 1st September 2017.  The cases are predominantly in young adults aged 18-22 years. Approximately  eighty percent of cases have had two MMRS.
The reasons for the increase are thought to be the same as in 2014/2015, with a contribution from lack of full vaccination (0,1 doses MMR), ? waning immunity despite two doses of MMR, and the fact the protection against mumps even with two doses of MMR is much lower than that for measles and rubella. The cases are occurring across Lothian, although with an focus in areas with a high density of young adults (e.g. higher education/universities).  Many of this exposed  population will return to other parts of Scotland for the festive period.
Link to our previous Lothian mumps outbreak paper- An outbreak of mumps with genetic strain variation in a highly vaccinated student population in Scotland. DOI:10.1017/S0950268817002102