[Jim Noble]

Most viral infections cause a low white blood count. Severe bacterial infections can do so also, but the number and type of the various cells that make up the WBC are very different with viral and bacterial infections.

I have not seen any data on these cases so as to be able to comment.

[steve86]

Most viral infections cause a low white blood count.

So this is one of the things involved in "suppressing the immune system". Correct me if I'm wrong.