Which abbreviations would be opposites? “fx” and “oa” “afeb” and “fuo” “top” and “aao” “sob” and “copd”

The abbreviations that seem opposites would be Afeb and FUO. Afeb is short for afebrile which means having no fever while FUO means Fever of Unknown Origin. It is the presence of fever more than 38.3 and it is intermittent, off and on for 3 weeks more without a cause being identified. It may be related to infections like viral infection, HIV or even cancer.

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Drop out early hard to juggle both