Subject + 感染 + Object
感染 (gǎnrǎn) means "to infect" or "to be infected" and is used in both medical and figurative contexts. It can describe contracting a disease or being emotionally influenced by something. For example, 他感染了病毒 means "He was infected with a virus."
他在旅行中感染了流感。
tā zài lǚxíng zhōng gǎnrǎn le liúgǎn.
He caught the flu while traveling.
她的热情感染了身边的每一个人。
tā de rèqíng gǎnrǎn le shēnbiān de měi yí gè rén.
Her enthusiasm was contagious to everyone around her.
医生说这种病毒很容易感染老人和小孩。
yīshēng shuō zhè zhǒng bìngdú hěn róngyì gǎnrǎn lǎorén hé xiǎohái.
The doctor said this virus easily infects the elderly and children.