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Puthanakit T, Anugulruengkitt S, Angsuwatcharakon P, Bunjoungmanee P, Kowitdamrong E, Primsirikunawut A, Intarakhao S, Chetsonwisorn P, Sophonphan J, Tangsathapornpong A. Low Measles Seropositivity Rate among Thai Adolescents in the Thai National Immunization Program. Vaccines (Basel) 2022; 10:vaccines10081269. [PMID: 36016157 PMCID: PMC9412740 DOI: 10.3390/vaccines10081269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/02/2022] [Accepted: 08/04/2022] [Indexed: 11/16/2022] Open
Abstract
To achieve the goal of measles elimination, herd immunity with 95% seroprotection in the community is required. This study aimed to describe the measles seropositivity rate among Thai children and adolescents. A cross-sectional study was conducted among children aged 3−18 years in Bangkok and its suburbs. Measles IgG antibodies were measured using a EUROIMMUN enzyme-linked immunosorbent assay kit. Seropositivity is defined as a measles IgG titer of ≥200 IU/L, due to a correlation with a >85% positive rate with a plaque reduction neutralizing titer of >120. Factors associated with seropositivity were analyzed using logistic regression analysis. From May to July 2020, 570 children with a median (IQR) age of 11.7 (9.4−14.8) years were enrolled. The geometric mean titer (GMT) of anti-measles IgG was 281 IU/L (95% CI; 257−306). The proportion of children with seropositivity was inversely correlated with age; 3−5 years 85.3%, 6−9 years 72.5%, 10−14 years 50.7%, and 15−18 years 56.3%. Adolescents aged 10−18 years had a lower measles seropositivity rate compared with young children; aOR 0.29 (95% CI 0.17−0.48). Only half of the adolescents who received two doses of measles-containing vaccine maintained measles IgG above the seropositive level. A measles booster dose for young adults may be needed to achieve the measles elimination goal.
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Affiliation(s)
- Thanyawee Puthanakit
- Division of Infectious Diseases, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
- Center of Excellence for Pediatric Infectious Diseases and Vaccines, Chulalongkorn University, Bangkok 10330, Thailand
- Correspondence: ; Tel.: +66-22-564-930
| | - Suvaporn Anugulruengkitt
- Division of Infectious Diseases, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
- Center of Excellence for Pediatric Infectious Diseases and Vaccines, Chulalongkorn University, Bangkok 10330, Thailand
| | | | - Pornumpa Bunjoungmanee
- Division of Infectious Diseases, Department of Pediatrics, Faculty of Medicine, Thammasat University, Pathumthani 12120, Thailand
| | - Ekasit Kowitdamrong
- Division of Virology, Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Athiwat Primsirikunawut
- National Institute of Thailand, Department of Medical Sciences, Ministry of Public Health, Nonthaburi 11000, Thailand
| | - Sukkrawan Intarakhao
- Division of Infectious Diseases, Department of Pediatrics, Faculty of Medicine, Thammasat University, Pathumthani 12120, Thailand
| | - Panadda Chetsonwisorn
- Center of Excellence for Pediatric Infectious Diseases and Vaccines, Chulalongkorn University, Bangkok 10330, Thailand
| | - Jiratchaya Sophonphan
- Center of Excellence for Pediatric Infectious Diseases and Vaccines, Chulalongkorn University, Bangkok 10330, Thailand
| | - Auchara Tangsathapornpong
- Division of Infectious Diseases, Department of Pediatrics, Faculty of Medicine, Thammasat University, Pathumthani 12120, Thailand
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