India, April 11 -- Measles cases are spreading rapidly across the United States. The country has already reported more than double the number of cases it saw in all of 2024. Texas alone has reported over 505 cases. People with both doses of the Measles, Mumps, and Rubella (MMR) vaccine have around 97 per cent immunity to the virus. However, if you were born between the years 1963 and 1967, your vaccine may not be up to the mark.

Before 1967, the MMR vaccines were made based on the 'killed' virus in which the pathogens that were prepared for the vaccines were first killed and then injected with just their viral proteins. All vaccines in 1967 and after were then based on the 'live' virus, making them extremely effective.

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