What's more, animals kept in these conditions can easily catch disease

而且生活在这种环境中的动物很容易患病

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This disease is surprisingly difficult to catch, as most people have a natural resistance to it.

这种病令人惊讶的难以患上，因为大多数人对它有一种先天的免疫力。

《柯林斯英汉双解大词典》

Now scientists find that those with one type of risky gene may also need to catch a virus to trigger the disease.

如今，科学家们发现拥有某一类型这种基因的人或许感染上一种病毒后才会引发克罗恩病。

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As for the cost of scanning, Vachon says it's cheaper to catch a disease early.

FORBES: Cranking Up the Volume

They are not protected at all at that age by the DTaP, and since a huge percentage of even appropriately vaccinated people can still catch and transmit the disease, parents cannot rely on the theory that their baby is safe from the disease if exposed to them.

FORBES: When Americans Rejected Small Pox Vaccines

But only 140, 000 people in the U.S. have the disease--too few to catch the interest of big drug companies.

FORBES: Magazine Article