asymptomatic
New York Todayから。
On Sunday, the governors of New York and New Jersey, under pressure from President Obama and medical experts, eased restrictions on travelers returning from West Africa.
Both governors announced that people, including medical workers, who have had contact with Ebola patients but are asymptomatic could be quarantined at home, not at hospitals.
asymptomatic「（病気の）（自覚）症状のない」はエイズあたりからニュースでも取り上げられるようになった言葉です。このように名詞、形容詞、副詞の頭に付けるa- /eI/は、「非、無、欠如」を表します。この接頭辞が次のsymptomaticを否定しています。（Astroriver）
