It’s not about some ONE reporting diarrhoea it’s about enough people reporting diarrhoea immediately after receiving a vaccine. The reports go via VAERS https:

It’s not about some ONE reporting diarrhoea it’s about enough people reporting diarrhoea immediately after receiving a vaccine. The reports go via VAERS https://www.cdc.gov/vaccinesafety/ensuringsafety/monitoring/vaers/index.html https://www.cdc.gov/vaccinesafety/ensuringsafety/monitoring/... Then when you find a meaningful number of people having issues you halt the use of that vaccine and investigate.