Optimum age for measles immunization in Malaysia

Area of Science:

• Immunology
• Epidemiology
• Public Health

Background:

• Measles infection is a significant global health concern.
• Understanding age-specific prevalence and seroconversion is crucial for effective vaccination strategies.

Purpose of the Study:

• To determine the age-specific prevalence of measles infection in Malaysia using serology.
• To assess age-specific seroconversion rates following measles vaccination.
• To identify the optimal age for measles immunization in the Malaysian context.

Main Methods:

• Serological testing was employed to assess measles antibody prevalence.
• Age-specific seroconversion rates post-vaccination were analyzed.
• Data was collected from a study conducted at the University Hospital, Kuala Lumpur, Malaysia.

Main Results:

• Passively acquired measles antibodies decreased with age until 3-5 months.
• Measles infection prevalence increased sharply from 12 months of age.
• Seroconversion rates after vaccination at 9 months ranged from 94% to 99%, with higher rates observed for vaccination at 11 months or older.

Conclusions:

• Measles infection is prevalent in Malaysia, with natural infection acquisition peaking between 12 months and 5 years.
• Vaccination at 11 months or older yields higher seroconversion rates and antibody titers.
• The optimal age for measles immunization in Malaysia is recommended to be 11 months.