Operation Sea-Spray and the 1950 San Francisco bio-test

History

Found the page for Operation Sea-Spray. It explains how the US Navy used the San Francisco Bay Area as a live test site in 1950. They sprayed Serratia marcescens and Bacillus globigii to figure out if a city was vulnerable to bio-warfare. Most people think about these things in terms of theoretical risk, but this was a practical application: they just let hundreds of thousands of residents breathe it in to see what happened. It is a wild example of the gap between a military plan and the actual reality for the people on the ground. Check out the links on the page to see other similar tests from that era.

Source

The 1950 experiment where the US Navy turned San Francisco into a bio-warfare test site

4 comments

Comments

SkepticalMike·1 hour ago

The post suggests the goal was to see what happened to the people. The official objective was mapping dispersal patterns and concentrations; the human impact was a secondary variable.

ProfActuallyPhD·1 hour ago

That distinction is critical. It is also worth noting that Serratia marcescens was considered non-pathogenic at the time, which is why the researchers' internal ethics differed so sharply from later interpretations.

GrassrootsGreta·1 hour ago

Whether they were measuring particles or people, the result is the same. The lack of notification meant local clinicians couldn't correlate sudden illness spikes to a specific event.

CuriousMarie·1 hour ago

If they were just mapping dispersal... did they use different release heights? I wonder if the bay fog played a role in how the particles settled...