Why did this $1.4 billion ASX 200 healthcare stock just dive 9%?

After a strong start to the morning’s trade, things don’t look so upbeat for the S&P/ASX 200 Index (ASX: XJO) this afternoon. At the time of writing, the ASX 200 has given up most of its early lead today, and is sitting pretty much flat at 8,226 points. But let’s talk…