Plus internal reasons, which researchers are still trying to figure out:
Even when it comes to everyday coughs and colds, women have the advantage. “If you look across all the different types of infections, women have a more robust immune response,” adds Sandberg. “If there’s a really bad infection, they survive better. If it’s about the duration of the infection, women will respond faster.” One explanation for this is hormones. Higher levels of oestrogen and progesterone could be protecting women in some way, not only by making our immune systems stronger, but also more flexible. This may help maintain a healthy pregnancy. A woman’s immune system is more active in the second half of her menstrual cycle, when she’s able to conceive.
