They assure him they have extremely stringent biosafety procedures. But they only ask for historical plague and pest samples twice. Mostly, though, they wanted things like live samples of various ancient grains, fruits, vegetables, animals, etc. Apparently bananas went extinct at some point.

That's that for his three days of Martian tourist attractions. Shall we move on to spawning hundreds of gates per system to create a deeply interconnected galactic transport network?

And thus as much of Cam's time as he wants to devote to it is spent on being a very efficient fountain of fantastic material wealth.