We won’t be sending humans to Mars. The human body is continuously shedding various microbes, not to mention bodily waste. We won’t risk contamination of Mars, especially after it’s confirmed there are existing life forms on Mars. So we’ll just keep sending sterilized robots.
Humans can’t live on Mars in any case. The human body won’t thrive or remain healthy in a low-gravity environment over a long term.
LOL! Yes, there are people who think humanity would be a “contamination”!
Mars is 3.7 G.
Microbes are already going there via the solar wind.