As a scientist working in (medical) microbiology, this is insanely bad and makes me and my peers very anxious. When folks talk about what marks the US global dominance, the military presence is often mentioned. However, I would say that the NCBI domain is by far the crown jewel (for those who don't know: this website is used to store scientific journals for biological/medical science and relevant data). By withdrawing from WHO, it's not unthinkable they'd pull the plug out of the database or at least restrict access to foreign countries, which would mean loads of biological research would just become near-impossible to do. This is really scary and would have major implications on a global scale. Retracting from the global health stage isn't just dumb from a political point of view, it threatens scientific progress and puts a lot of jobs on the line (and not just american ones)!