To be fair its nonsense rhetoric to ask someone to prove the non-existence of something you aren't able to measure (given we can't just barge into people homes

To be fair its nonsense rhetoric to ask someone to prove the non-existence of something you aren't able to measure (given we can't just barge into people homes and start probing them). But there is a likelihood that other people who have symptoms will now come forward seeing this, so the people of Santa Clara Square still might have more for us. I would be surprised it doctors can't detect if the patient has been poisoned.