4 sentences

1. 我有传染性吗？

   wǒ yǒu chuán​rǎn​xìng ma?

   Am I contagious?

   Source: OpenSubtitles

2. 科学家们正在研究该病毒的传染性。

   kē​xué​jiā men zhèng​zài yán​jiū gāi bìng​dú de chuán​rǎn​xìng.

   Scientists are studying the infectivity of the virus.

   Source: Dong Chinese Dictionary

3. 流感是一种传染性很强的呼吸道疾病。

   liú​gǎn shì yī zhǒng chuán​rǎn​xìng hěn qiáng de hū​xī​dào jí​bìng.

   Influenza is a highly contagious respiratory disease.

   Source: Dong Chinese Dictionary

4. 这种病毒发生了基因突变，变得更具传染性。

   zhè zhǒng bìng​dú fā​shēng le jī​yīn tū​biàn, biàn de gèng jù chuán​rǎn​xìng.

   The virus has mutated genetically, becoming more contagious.

   Source: Dong Chinese Dictionary