Evidence from medical and parasitological literature indicates that parasitic infections impair reproductive health and cause infertility or adverse pregnancy outcomes rather than increasing pregnancy rates.
The claim states that parasitic infections increase human pregnancy rates. The retrieved papers that touch on parasites and reproduction (e.g., [7] on neglected tropical diseases and infertility, and [11] on Toxoplasma gondii-induced reproductive toxicity) show that parasitic infections impair reproductive health, cause hormonal disruptions, and lead to infertility or tissue damage. There are no papers supporting the claim that parasites increase pregnancy rates. Therefore, the balance of evidence clearly refutes the claim.