Health officials plan to include the deaths of 25 children as part of an upcoming presentation to the Centers for Disease Control and Prevention's Advisory Committee on Immunization Practices, according to four people familiar with the situation who spoke anonymously with the Post.

The findings they plan to present appeared to be pulled from the Vaccine Adverse Event Reporting System, or VAERS, which collects claims of adverse reactions and results of taking vaccines. But because the claims are self-reported and unverified, the system can sometimes be exploited by anti-vaccine activists. People sometimes submit fraudulent claims, or they deliberately present the data as verified in order to stoke fear around vaccines.

The CDC has previously emphasized that the database is not designed to determine a link between a shot and individual deaths. In fact, VAERS comes with a disclaimer that users must acknowledge they have read and understood before they can use the database: "VAERS reports alone cannot be used to determine if a vaccine caused or contributed to an adverse event or illness. The reports may contain information that is incomplete, inaccurate, coincidental, or unverifiable. Most reports to VAERS are voluntary, which means they are subject to biases."