Conversely, optimism is also transmittable.

反之，乐观亦会传播。

Thee bird-flu virus manages to become easily transmittable between humans.

禽流感病毒变成可以在人与人之间轻易传染。 。

For the transmittable thing in a story is the identifying essence, the characterising savour, the peculiar quality and point of view of the humour, pathos, or interest.

因为一个故事中可以传达的东西其实就是它和听众产生共鸣的同一性要素；描述的风味；它独有的特质；对于情绪的不同着眼点以及让人感伤的内容或者某种嗜好。

Food-borne outbreaks such as E. coli and transmittable respiratory illnesses are also a threat, he said.

CNN: Experts: Disease outbreaks a real threat