uncommon

Ebola outbreak with uncommon strain erupts in Congo and Uganda: 65 deaths And that headline again from Ars Technica, a technology, science and politics website.

I used to have this impression that breakthroughs were uncommon, sporadic, sometimes happening by pure chance, sometimes by sheer determination.

Ebola outbreak with uncommon strain erupts in Congo and Uganda: 65 deaths This headline was from the 15th of May, and since then the death toll has risen.