[wahern]

AFAIU, combined vaccines are preferred in the U.S. because we have problems with compliance, scheduling, and follow-up, especially in at-risk communities. Minimizing the number of appointments this way is a simple technological workaround to deeper sociocultural issues. Other countries may have similar problems, but the U.S. has a habit of leaning on technological solutions, for multiple reasons but in no small part because we're crazy rich and can; whereas some other countries are more predisposed to low-tech, behavioral remedies.

[philliphaydon]

Makes sense. Thanks.

And thanks for the link in the other reply.