**Updated Post 7**
My almost three year old is going to the dr today for a large (really large) mass or swelling or *something* in his neck, under his jaw line. It's like a gigantic swollen gland, but it's not where his glands are typically swollen (he is a pretty glandular kid, he has an immune deficiency and allergies, so he often has marble-sized glands on his neck, but they are individual glands and are farther back on his neck, this is a huge single swelling, and more upfront).
We had strep in our house a week and a half ago (my husband and my oldest son) so at first I thought that he might have strep. But first of all, he's not sick (anymore, he had a cold when the rest of us were sick, it looks like my husband and older son's colds turned into strep, while my middle son and I had just colds), and also, the gland is just..."different". I looked up picture of Mumps online, and it looks very similar, except that his is only on one side.
ANYWAY...here's my question...assuming this is Mumps...my older son had one dose of MMR, myself and my husband are fully vaccinated (last doses at age 5ish). The baby is not vaccinated, my middle son is not vaccinated.
My first question is, does acquiring Mumps always give permanent natural immunity in an otherwise healthy person? Does that immunity lessen in time?
My older son had one dose of MMR, but is supposed to be due for another dose anytime now (he'll be 5 soon...I wasn't planning on giving him that second dose). I know the vaccine is 70-90% effective, but what is the effectiveness at his age, considering he's "due" for another dose? In other words, what are his chances of getting Mumps too? Does this natural exposure, even if he doesn't get sick, boost his immunity anyway?
Is there any sort of secondary illness later on from Mumps (like Shingles and Chicken Pox)?
For those that are familiar with immunology...My son that might have Mumps has a Primary Immune Deficiency (t-cell deficit, stemming from an underdeveloped Thymus gland; DiGeorge Syndrome). We just had his t-cell counts re-done, his CD3 total t-cells were 2217, CD4 total helper cells was 1406. Do you think that he will retain any immunity from this infection? He had lab-confirmed chicken pox but did not retain any immunity, but his CD4 count then was 1231 so a bit lower than it is now.