Having parasites can boost fertility
Women infected with giant roundworms have more babies
![women and children](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/11/111915_mr_parasite-notebook_free.jpg?fit=860%2C460&ssl=1)
EXTRA BABIES Roundworms may act as a fertility aid: Tsimane women in Bolivia infected with the intestinal parasites may have more children than uninfected women.
Michael Gurven