Immunologists at the University of Freiburg have now solved a mystery about how it works.
Xubnaha mucaaradka ku ah madaxweyne farmaajo ee hadda ku sugan magaalada muqdisho ayaa waxa ay bilaabeen kulamo xasaasi ah oo ku saabsan qaabkii uu xilka u baneey lahaay ra'isul wasaare xasan cali kheyre.