My son (12 yes old) started raising quail about a year ago because he is highly allergic (anaphylactic) to chicken eggs (among other things) and we found that he was not allergic to quail eggs.
First, I'm not a doctor and I'm not claiming my information to be fact- this is from our own experiences and research for our own family.
What I have learned is that there is a difference between "allergies" and "sensitivities". It has to do with the immune system's IgE's and IgG's. Basically, an allergy is diagnosed by skin tests and sometimes blood tests, and usually have immediate reactions when a person comes in contact with the allergen. A sensitivity is a delayed reaction from an allergen and is often tested through blood tests.
I say this because many allergists refuse to recognize sensitivities as an allergy. Our family suffers from both and we can clearly see the difference. Many people are plagued with sensitivities and never recognize them because they are hard to directly link with something because of their delayed reaction. It can be things like stomach aches, headaches, joint aches, tiredness, foggy thinking, stuffy head and so on.
Eggs are a huge part of our diet and we are so grateful that we found an egg that our whole family can enjoy for all our egg sensitivities and allergies.
If you know anyone with chicken egg allergies or sensitivities, suggest that they CAUTIOUSLY try quail eggs as an alternative. I have heard in rare occasions that people can be just as allergic to quail eggs but more often, it is a safe option!
Ps. Before we learned my son could eat quail eggs, he had never eaten any kind of egg and he would ask if they were good. We would say, "your not missing anything great," so that he wouldn't feel left out. The first time he tried a quail egg he exclaimed, "You fibbed to me Mom! These are amazing!"