Delta 32
Plagues are not all bad, and the Black Death (bubonic plague) that swept into Europe from Asia in 1346 was no exception. It is now common knowledge that bacteria, insects, plants, and even humans can build up resistances to poisons, diseases, and antibiotics. Mutations are always occurring; some good, some neutral, some bad. It has been found that a human mutation designated CCR5-delta 32 confers immunity to AIDS if inherited from both parents. People carrying the CCR5-delta 32 mutation lack the receptors to which the AIDS virus must attach itself if it is to infect the person.With regards to the Black Death, one-quarter to one-third of the Europeans succumbed between 1347 and 1350. The Black Death strongly modified the European gene pool, increasing the frequency of CCR5-delta 32. This mutation may not have had any direct effect on the plague itself. It may just be a quirk of fate that the survivors of the Black Death had a higher frequency of the CCR5-delta 32 mutation, and it is doubly quirky that the mutation confers a resistance to AIDS, which is a recent human affliction.
It seems that there must have been something that occured during the 17th century that may have caused this or mabye it was just a mutation and this mutation has spread throughout Europe over time.
It seems that there must have been something that occured during the 17th century that may have caused this or mabye it was just a mutation and this mutation has spread throughout Europe over time.