The infectious disease spread rapidly through the crowded refugee camp, prompting urgent quarantine measures.
这种传染病在拥挤的难民营中迅速传播，促使采取了紧急隔离措施。
Which choice best defines “infectious”?
A — Likely to spread infection. “infectious” means likely to spread infection.
Which word means “likely to spread infection”?
B — infectious. “infectious” means likely to spread infection.
infectious — likely to spread infection. In Chinese: 传染的.
infectious is pronounced /ɪnˈfɛkʃəs/.
The infectious disease spread rapidly through the crowded refugee camp, prompting urgent quarantine measures. (这种传染病在拥挤的难民营中迅速传播，促使采取了紧急隔离措施。)
contagious, transmissible, communicable — all close in meaning to infectious (likely to spread infection).
noninfectious, harmless — each the opposite of infectious (likely to spread infection).
Yes. infectious is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.