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I thought neonatal jaundice was from the vitamin K shot. It may still well be, but neonatal jaundice may protect a baby from sepsis?

I think this idea is a stretch, but worth a read.

Thinking about babies in caves in days gone by, with no healthcare and certainly no antibiotics, Richard realised that the biggest threat to their life after surviving delivery would probably be overwhelming sepsis in the first few days – exactly when the bilirubin level rises naturally. Could jaundice be an evolutionary mechanism to protect against this?...Some early signals supporting the hypothesis first emerged in 2009 when the team found that bilirubin seemed to impact the growth of the bacteria that most commonly causes early sepsis in babies, Gram-positive Streptococcus agalactiae. With other bacteria implicated in sepsis, the results were mixed: bilirubin also affected some types of Staphylococci, but not Gram-negative Escherichia coli.


https://theconversation.com/jaundic...EOKuSWEDGzwq_Z8tp1A4ErU1qFa7MrVjtM1--zYeXit2I
 
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