| OPP | any infection caused by a microorganism that does not normally cause disease in humans |
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| OPP | a possibility due to a favorable combination of circumstances |
| OPP | cost in terms of foregone alternatives |
| OPP | capable of being placed opposite to something |
| OPP | be against |
| OPP | be resistant to |
| OPP | set into opposition or rivalry |
| OPP | fight against or resist strongly |
| OPP | act against or in opposition to |
| OPP | place in opposition: can also be used in an abstract sense |
| OPP | being in opposition or having an opponent |
| OPP | in opposition to (a policy or attitude etc.) |