can you imagine that after 70% of the US population get's vaccinated (let's agree that the vaccine is effective as a premise, right...) and in non-obese individuals immunity will be 90% and 60% of the US population is non-obese: *  60% non obese x 70% x 90% => 37,8%  total immunization by that group *  40% obese, most get vaccinated cause they're scared (90%) and it's 60% effective (just a guess) => 21,6% Total percentage of immunized: 59,4%. And this is just based upon a few assumptions. Seems like it could still do its job and fatties won't completely ruin it for us.  Also who belongs to the ones that don't wanna get immunized and will spread it to fatties?