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Endometriosis is a condition in which tissue, similar to the lining of the uterus, grows outside the uterus, and can cause infertility.

Untreated STIs can lead to infertility and increase the risk for cervical and anal cancers.

Given other STIs can cause infertility, pain and pelvic inflammatory disease, the notion they are easily remedied is one many professionals wish to tackle.

So far only three of the vaccinated koalas in this research trial have contracted the disease, though all recovered, and encouragingly, more than two dozen joeys have been born - bucking the infertility trend.

They have been linked to extreme health problems like cancer, high blood pressure and infertility.