This one, from the UK Independent (though extensively available elsewhere, too), with the title:
Man flu is real: Scientists say men have weaker immune systems
And this picture:
We are told that women have stronger immune systems than men. We are then told that a study has shown this. We then find out that it's mouse women who seem to have stronger immune systems than mouse men, at least against the bacteria streptococcus pneumoniae:
Scientists from Harvard University have discovered that the female sex hormone oestrogen fortifies the immune system, and men are suffering for its absence.Bolds are mine.
In the study, published in Life Sciences medical journal, a simple dose of oestrogen was capable of curing both male and female mice of bacterial pneumonia.
I know the arguments used to justify rodent studies as possibly applicable to humans. But there's a pretty large leap from mice to men, and there's always the very real possibility that a similar study done, say, on rats, wouldn't have found the same results.
Or perhaps it would have. But if it hadn't it wouldn't have been popularized.
Popularizations which take rodent data and treat it as if it was data on humans are not uncommon when it comes to female rodents and women. Indeed, those studies have been used to lecture women on ethically correct behavior. I haven't spotted many popularizations which equate men with male mice and then try to teach men how to behave better*. I wish we didn't do that crap for either gender.
*The one exception I recall is this.