One study did identify heavy pesticide use due to concerns about Zika virus and measured changes in people’s brains before and after their trips to Cuba: https

One study did identify heavy pesticide use due to concerns about Zika virus and measured changes in people’s brains before and after their trips to Cuba: https://www.cbc.ca/news/canada/havana-syndrome-neurotoxin-enqu%C3%AAte-1.5288609 https://www.cbc.ca/news/canada/havana-syndrome-neurotoxin-en...