Two people confirmed on Saturday to be infected with bird flu ...请问句子中的两个to be是什么用法?

Two people confirmed on Saturday to be infected with bird flu ...请问句子中的两个to be是什么用法?
Two people confirmed on Saturday to be infected with bird flu were reported to be in critical condition yesterday after being tested positive for deadly H5N1 virus.
请问蓝色划线加粗斜体部分是什么语法?第一个to be infected可以写成being infected也可以,为什么要用to be呢?第二个去掉to be in critical condition,直接were reported in critical condition 好像语法上也没错误阿?能不能再举一两个相关的例子?
非常不好意思,问题比较弱智,请各位高手、大虾们伸出援制之手哦,
不好意思，发到百度上后，原先的标示没了。蓝色划线加粗部分就是两个to be的结构。
to be infected with...
to be in critical condition...