UNSPECIFIED (2001) Predicting and comparing long-term measles antibody profiles of different immunization policies. BULLETIN OF THE WORLD HEALTH ORGANIZATION, 79 (7). pp. 615-624.

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Abstract

Objective Measles outbreaks are infrequent and localized in areas with high coverage of measles vaccine. The need is to assess long-term effectiveness of coverage. Since 1991, no measles epidemic affecting the whole island has occurred in Taiwan, China. Epidemiological models are developed to predict the long-term measles antibody profiles and compare the merits of different immunization policies on the island.

Methods The current measles immunization policy in Taiwan, China, is 1 dose of measles vaccine at 9 months of age and 1 dose of measles, mumps and rubella (MMR) vaccine at 15 months of age, plus a 'mop-up' of MMR-unvaccinated schoolchildren at 6 years of age. Refinements involve a change to a two-dose strategy. Five scenarios based on different vaccination strategies are compared. The models are analysed using Microsoft Excel.

Findings First, making the assumption that measles vaccine-induced immunity will not wane, the predicted measles IgG seroprevalences in preschool children range from? 81% (lower bound) to 94% (upper bound) and in schoolchildren reach 97-98% in all strategy scenarios.

Results are dependent on the association of vaccine coverage between the first and second dose of vaccine. Second, if it is assumed that vaccine-induced antibody titres decay, the long-term measles seroprevalence will depend on the initial titres post vaccination, decay rates of antibody titres and cut-off of seropositivity.

Conclusion If MMR coverage at 12 months of age can reach: > 90%, it would be worth changing the current policy to 2 doses at 12 months and 6 years of age to induce higher antibody titres. These epidemiological models could be applied wherever a similar stage of measles elimination has been reached.

Item Type:	Journal Article
Subjects:	R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
Journal or Publication Title:	BULLETIN OF THE WORLD HEALTH ORGANIZATION
Publisher:	WORLD HEALTH ORGANIZATION
ISSN:	0042-9686
Official Date:	2001
Dates:	Date Event 2001 UNSPECIFIED
Volume:	79
Number:	7
Number of Pages:	10
Page Range:	pp. 615-624
Publication Status:	Published

Data sourced from Thomson Reuters' Web of Knowledge

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