Neanderthals would have limited immunity to diseases they had not been exposed to, so diseases carried into Europe by Homo sapiens could have been particularly lethal to them if Homo sapiens were relatively resistant.
Neanderthal memiliki kekebalan terbatas terhadap penyakit yang belum mereka temui, sehingga penyakit yang dibawa ke Eropa oleh Homo sapiens bisa sangat mematikan untuk mereka sementara Homo sapiens relatif tahan.