The reviewer shall remain decently anonymous.
...the immune system is thought to be involved in fighting disease, pregnancy and the brain.
Two thoughts, here (which is, I fear, at least one more than the writer seems to have bestowed on this bit of his review).
First: if the immune system didn't fight disease then it wouldn't be...er...an immune system. Would it?
Second: if the writer had put fighting disease at the end of his list then he'd have saved himself embarrassment.
But, hey, it gave me a laugh.
Word To Use Today: immune. This word comes form the Latin immūnis, which means exempt from public service, from mūnis, which means duty.