Why "Infect Everyone with Mild Illness" Doesn't Work for Herd Immunity
Deliberately spreading mild illness for herd immunity fails because severity is unpredictable per person, more infections mean more mutations, and simultaneous spread overwhelms healthcare. Vaccination achieves the same goal safely.
The intuition that deliberately spreading mild illnesses would build herd immunity faster than isolation policies seems logical but fails for several reasons: 1. Unpredictable severity: What seems "mild" varies enormously between individuals. Flu that is inconvenient for a healthy adult can kill an immunocompromised person, an elderly individual, or someone with underlying conditions. 2. Mutation risk: Every infection is a replication opportunity for the pathogen. More infections = more mutations = higher chance of a more dangerous variant emerging. 3. Healthcare system capacity: Even a "mild" disease spreading through an entire population simultaneously overwhelms hospitals — this was precisely the "flatten the curve" lesson of COVID-19. 4. Some diseases don't grant lasting immunity after infection — you can catch them repeatedly. The "stay home when sick" policy evolved from genuine public health evidence, though workplace economics do play a role. Studies consistently show that sick workers spread illness to colleagues, creating cascading productivity losses that exceed the cost of one person staying home. Vaccination achieves the same herd immunity goal without the risks of uncontrolled infection — it's the deliberate version of what the "infect everyone" idea attempts.