Responding to comment below here. Not exactly, it's a normal function of cellular division that they get shorter (due to how DNA replication works). The early infections just cause a lot of immune cell replication to fight off diseases and for some reason at that stage, telomerase (the enzyme which keeps telomeres from shortening as quickly) is not sufficient to prevent significant shortening. Don't know why yet, more research into it will be necessary to better understand and the why. They have just reported the observation that this happens.
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Appreciate the explanation. That is what I kind of figured but had no way of knowing for sure.