Exposure to chicken pox less than two weeks after vaccine...

[SpottyTeacakes]

Argh both dc had their first cp jab on 3rd this month.

Dd's best friend came out in spots yesterday (possibly from the nursery they go to together?) we spent most of Thursday with them.

My £224 is going to be wasted isn't it?

Actually, you might find you haven't wasted your money as the vaccine can actually be recommended post exposure:
"Getting Vaccinated After You Are Exposed to Chickenpox
If you do not have immunity against chickenpox and are exposed to someone with this disease or shingles, talk with your doctor about getting chickenpox vaccine.
You should get chickenpox vaccine within 3 to 5 days of being exposed.
You need 2 doses of vaccine are two different times. For more information, see Who Needs Chickenpox Vaccine.
If you previously got one dose of chickenpox vaccine, you should get a second dose.
Getting vaccinated after you are exposed to someone with chickenpox can
prevent the disease or make it less serious
protect you from chickenpox if you are exposed again in the future"
From here: www.cdc.gov/vaccines/vpd-vac/varicella/basic-vacc-after-exposed.htm
Similar here: www.immunize.org/askexperts/experts_var.asp
Cheers,
Rosewind

Thanks that's really interesting. Ds has got what look like little pimples on him (about ten) but I could be being paranoid. So the vaccine should already be affective at protecting against cp if only to reduce the severity?

There's a Cochrane brief on the subject too:
www.aafp.org/afp/2009/0901/p455.html
www.ncbi.nlm.nih.gov/pubmed/18646079

To quote:
"Three studies involving 110 healthy children who were siblings of household contacts were identified as suitable for inclusion. The studies varied in quality, study design, vaccine used, and outcomes measured and, as such, were not suitable for meta-analysis. Overall, 13 out of 56 vaccine recipients (18%) developed varicella compared with 42 out of 54 placebo (or no vaccine) recipients (78%). Of the vaccine recipients who developed varicella, the majority only had mild disease (with less than 50 skin lesions). In the three studies, most subjects received PEP within three days following exposure; too few subjects were vaccinated four to five days post exposure to ascertain the efficacy of vaccine given more than three days after exposure. No included studies reported on adverse events following immunisation."

Obviously it's no guarantee. If they do get it, my top tip is piriton for the itching.
Cheers,
Rosewind