Mumps: MMR vaccination and genetic diversity of mumps virus, 2007-2011 in Catalonia, Spain
Por:
Anton, A, Pumarola, T, Costa, J, Dominguez, A, Alvarez, J, Arias, C, Barrabeig, I, Camps, N, Carol, M, Godoy, P, Martinez, A, Minguell, S, Parron, I, Sala, MR, Rovira, A, Torner, N, Rius, C
Publicada:
9 nov 2019
Resumen:
Background Mumps is a vaccine-preventable disease but outbreaks have been reported in persons vaccinated with two doses of MMR vaccine. The objective was to describe the demographic features, vaccination effectiveness and genetic mumps virus diversity among laboratory-confirmed cases between 2007 and 2011 in Catalonia. Methods Cases and outbreaks of mumps notified to the notifiable diseases system of Catalonia between 2007 and 2011 retrospectively registered were included. Public health care centres provided written immunization records to regional public health staff to determine the vaccination history. Saliva and serum specimens were collected from suspected cases for laboratory-confirmation using real-time reverse-transcriptase PCR (rtRT-PCR) or serological testing. Phylogenetic analysis of the complete SH gene (316 nucleotides) and complete coding HN protein (1749 nucleotides) sequences was made. Categorical variables were compared using the Chi-square or Fisher's tests and continuous variables using the Student test. Vaccination effectiveness by number of MMR doses was estimated using the screening method. Results During the study period, 581 confirmed cases of mumps were notified (incidence rate 1.6 cases/100,000 persons-year), of which 60% were male. Three hundred sixty-four laboratory-confirmed cases were reported, of which 44% were confirmed by rtRT-PCR. Of the 289 laboratory-confirmed cases belonging to vaccination cohorts, 33.5% (97) had received one dose of MMR vaccine and 50% (145) two doses. Based on phylogenetic analyses of 316-nucleotide and 174-nucleotide SH sequences, the viruses belonging to viral genotypes were: genotype G (126), genotype D (23), genotype H (2), genotype F (2), genotype J (1), while one remained uncharacterized. Amino acid differences were detected between circulating strains and the Jeryl Lynn vaccine strains, although the majority of amino acid substitutions were genotype-specific. Fifty-one outbreaks were notified that included 324 confirmed mumps cases. Genotype G was the most frequent genotype detected. The family (35%), secondary schools (25%) and community outbreaks (18%) were the most frequent settings. Conclusions Our study shows that genotype G viruses are the most prevalent in Catalonia. Most cases occurred in people who had received two doses of MMR, suggesting inadequate effectiveness of the Jeryl Lynn vaccine strain. The possible factors related are discussed.
Filiaciones:
Anton, A:
Hosp Clin Barcelona, Ctr Diagnost Biomed, Virol Unit, Barcelona, Spain
Pumarola, T:
Hosp Clin Barcelona, Ctr Diagnost Biomed, Virol Unit, Barcelona, Spain
Costa, J:
Hosp Clin Barcelona, Ctr Diagnost Biomed, Virol Unit, Barcelona, Spain
Inst Hlth Carlos III, CIBER Enfermedades Hepat & Digestivas, Madrid, Spain
Dominguez, A:
Inst Hlth Carlos III, CIBER Epidemiol & Salud Publ, Madrid, Spain
Alvarez, J:
Publ Hlth Agcy Catalonia, Barcelona, Spain
Arias, C:
Publ Hlth Agcy Catalonia, Barcelona, Spain
Barrabeig, I:
Hosp Univ Bellvitge, Generalitat Catalonia, Agcy Publ Hlth Catalonia, Epidemiol Surveillance & Response Publ Hlth Emerg, Edifici Antiga Escola Infermeria,3A Planta, Lhospitalet De Llobregat 08907, Spain
Inst Hlth Carlos III, CIBER Epidemiol & Salud Publ, Madrid, Spain
Publ Hlth Agcy Catalonia, Barcelona, Spain
Camps, N:
Publ Hlth Agcy Catalonia, Barcelona, Spain
Carol, M:
Publ Hlth Agcy Catalonia, Barcelona, Spain
Godoy, P:
Publ Hlth Agcy Catalonia, Barcelona, Spain
Martinez, A:
Publ Hlth Agcy Catalonia, Barcelona, Spain
Minguell, S:
Publ Hlth Agcy Catalonia, Barcelona, Spain
Parron, I:
Publ Hlth Agcy Catalonia, Barcelona, Spain
Sala, MR:
Publ Hlth Agcy Catalonia, Barcelona, Spain
Rovira, A:
Publ Hlth Agcy Catalonia, Barcelona, Spain
Torner, N:
Hosp Univ Bellvitge, Generalitat Catalonia, Agcy Publ Hlth Catalonia, Epidemiol Surveillance & Response Publ Hlth Emerg, Edifici Antiga Escola Infermeria,3A Planta, Lhospitalet De Llobregat 08907, Spain
Inst Hlth Carlos III, CIBER Epidemiol & Salud Publ, Madrid, Spain
Univ Barcelona, Dept Med, Barcelona, Spain
Publ Hlth Agcy Catalonia, Barcelona, Spain
Rius, C:
Publ Hlth Agcy Barcelona, Barcelona, Spain
Green Published, gold
|