measles titers down, rubeola titers way up??

[Guest guest]

Dr. JM or anyone,

I just got my son's titers checked and compared to a year ago, his

measles titers are down (1.77 now vs. 2.29 last year), but his

rubeola titers are way up - 4.07 now vs. 2.55 last year. Does anyone

have an idea what may have caused this, or is it something to worry

about?

Oddly enough, his twin sister's titers (they had all the same

vaccinations) are almost identical this year (I didn't have hers

checked last year) - measles 2.25 (what my son's were last year) and

rubeola 4.29.

Neither one of them were sick last year, other than a couple mild

colds and a stomach virus.

I didn't do high dose vitamin A on my son, but have consistently

given him low (5-10k IU) doses of vitamin A over the last year.