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MMR vaccine plus preschool booster

(2 Posts)
Fairydoll2030 Thu 14-Sep-17 18:44:06

My 3.5 year old DGS has just had the above. I read that it's a 'live' vaccine. Does that mean that he could be potentially infectious?
I only ask this as I have a slightly compromised immune system and was seriously ill with an infection a couple of years back.
Sorry for the ignorance - but 'googling' left me confused.

Fairydoll2030 Thu 14-Sep-17 18:49:28

I've just realised that measles etc,is caused by a virus so I can't figure out why I read they 'use live bacteria!

Any guidance much appreciated.