Dani,
SHB's pose a huge problem in the south of USA. I have not treated my stock for v. mites for two decades now, but I' ve lost quite a few to SHB's regularly. It is now next to impossible to make splits in summer; the splits becoming a smorgasbord for the SHB. Typically, as the nucs expand, their numbers are still limited so they cannot patrol the newly filled (nectar and pollen) combs, areas that are vulnerable for SHB invasion. Unchecked, SHB's can wipe out a strong colony in three days. Some colonies abscond even in November, hopelessly. Given how bee pathogens are propagated throughout the world, I fear you too will get SHB's, given time, looking at how v. mites jumped from Apis Cerana thanks to global trade.