When European ladybug species eat the harlequin ladybird eggs and larvae, they also consume the microsporidia. And die.

当欧洲瓢虫吃小丑瓢虫卵和幼虫，也吃掉了微孢子虫。然后们就会死。

A parasite called microsporidia lies dormant in the circulatory systems of harlequin ladybirds.

这种叫做“微孢子虫”寄生虫潜藏在小丑瓢虫循环系统内。

When the ladybugs were injected with dead microsporidia or a control substance most survived.

当植入死微孢子虫或者对照物质，大多数都存活了。

But when scientists injected microsporidia into a common European ladybug species, the insects died within two weeks.

然而，当科学家向普通欧洲瓢虫体内植入微孢子虫，不出两个星期们就死亡了。