The rule works two ways.
One, that the outfit be confined within a certain area so that
it has less chance of being contaminated.
Two: that the outfit do not carry infection out of the OT to the
public area.
Staff like to phoo phoo the rule as over reacting, but it is
better to be safe than to be sorry. Cross contaminatiion is
unlikely to happen, but safeguards must be up to ensure that it
NEVER happens.