Mumps outbreak in a highly vaccinated school population: assessment of secondary vaccine failure using IgG avidity measurements.
From March to April 2006, an outbreak of mumps occurred in Gyeonggi, Korea. The aim of this study was to describe and discriminate between primary and secondary vaccine failure in a highly vaccinated population for mumps using IgG avidity testing. Fifteen clinical mumps cases occurred among 41 students. Among these 15 patients, 11 vaccinated patients were considered secondary vaccine failures with high IgG titers and a high avidity index (AI, > or =32%); an unvaccinated patient was considered to have primary infection with high IgG titers and low AI, and three vaccinated patients were considered as other infections with low IgG titers and low AI. Among 26 unaffected students, 5 vaccinated patients were retrospectively diagnosed as sub-clinical infection with high IgG titers and high AI; the remaining students had low IgG titers and low AI except for one previously infected student. The results of this study show that secondary vaccine failure played an important role in this mumps outbreak. Therefore, booster immunization for mumps should be considered in immunized adolescents to prevent further outbreaks.
Park
Dae Won
DW
Department of Internal Medicine, College of Medicine, Korea University, 126-1 Anam-dong 5th Str, Seongbuk-Gu, Seoul, Republic of Korea. pugae1@hanmail.net
Nam
Myung-Hyun
MH
Kim
Jung Yeon
JY
Kim
Hee Jung
HJ
Sohn
Jang Wook
JW
Cho
Yunjung
Y
Song
Ki-Joon
KJ
Kim
Min Ja
MJ
D000293:Adolescent; D000914:Antibodies, Viral / Q000097:blood / Q000276:immunology; D000915:Antibody Affinity; D004196:Disease Outbreaks; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D007723:Korea; D008297:Male; D009107:Mumps / Q000453:epidemiology* / Q000276:immunology*; D009108:Mumps Vaccine / Q000276:immunology*; D009109:Mumps virus / Q000276:immunology; D013334:Students
D000914:Antibodies, Viral; D007074:Immunoglobulin G; D009108:Mumps Vaccine