If you carry Toxoplasma gondii then you HAVE toxoplasmosis. It's just that toxoplasmosis is generally asymptomatic, you are indeed correct in that it causes a much bigger issue in immune compromised people.
Martin Shkreli
Ugh. Whether or not there was a misconception surrounding the outrage Shkreli didn't do pharmaceuticals any favors in the battle of public perception.
As a side note you are also correct about pryimethamine (Daraprim) being used to treat toxoplasmosis, it isn't an AIDS medication, but a way to deal with one of the other complications of the sputtering immune system.
Fair call.
For me I was fascinated by the phenomenon of how that story went viral, and how the facts were presented and re-presented, essentially mutating as the facts became more blurred. I feel like journalists are being a little more responsible with their reporting in 2017, both in terms of fact-checking and also in the way they present key facts. Likewise, people seem to be a lot better at google'ing things they see on Facebook to check accuracy.
But I digress... a lot.
Like a game of telephone. This is why I think better understanding of science, and a wide variety of other fundamental pieces of knowledge are becoming more and more a requirement for every day life. We can't always depend on others to get it right, we must have a basic understanding of things to know when we are being bullshitted.