Do you mean
Discospondylitis?http://aolsearch.aol.co.uk/web?query=Discospondylitis.The above web page will give you any number of links to information about this condition.
You call it both a condition and an infection. These would have totally different causes.
If you mean
Aspergillosis infection in the spine then this can be caught simply by breathing normal air as the fungus is present naturally. It usually, only causes a problem when large quantities of fungus are breathed in (eg. Farmers Lung) or the immune system is compromised in some way.
Hope this information is helpful for you
Regards
Dill