Fact check: Vaccines can't be sprayed in 'chemtrails,' scientists say

USA Today

The inhaled vaccine technology being developed at Yale cannot be sprayed from the sky in a “chemtrail,” as a social media post suggests. Inhaled vaccines require measured doses delivered directly into the nose. Experts agreed spraying a vaccine from airplanes is not feasible or ethical. Dr. Christopher Sanford, associate professor of global health and of medicine in the UW School of Medicine, is quoted.