Why are the crew wearing anti-contamination suits?

In Westworld Episode 7 the working crew comes into the Westworld wearing some kind of anti-contamination suits to retrieve Clementine Pennyfeather, while all the other hosts are frozen
But we saw working crew coming on Westworld many times before without any suit, so why are they wearing them in this particular situation ?
Best Answer
It doesn't seem to be a contamination issue since 'killed' and 'deactivated' hosts are interacted with by the human technicians in a variety of clothing.
However, while in the park itself, the hosts are programmed not to see, notice or recognise anything that they would not know of in their supposed storyline/environment.
Since the hazmat suits are not of the 'in park' time period, the wearers would not be visible to the hosts and would be ignored. It's also possible that hosts are specifically programmed to ignore people wearing such suits.
Which is why it so shocking when Maeve does start remembering them.
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