Whether they've bred their Burmeses with other breeds (they should disclose this and it might allow it to be not a purebred lien.
All cats are often screened for feline leukemia and present-day on their vaccines. And https://ztndz.com/story20802092/the-smart-trick-of-burmese-kittens-for-adoption-near-me-that-no-one-is-discussing