I went into PubMed to check if any info and found a message from 28th Feb
saying they are now adding indexed citations (finally!)
There is a link to the news item from the home page, or go to
http://www.ncbi.nlm.nih.gov/entrez/query/static/new.html
(which also has some older news items eg the introduction of a complementary
medicine subset).
Being a cautious soul, I double checked by searching asthma[MeSH], limited
to entrez date of last 60 days, and was pleased to find several citations
from Jan and Feb publications.
Fiona
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