 Mu gihe wokingira gusa abasanzwe bageramiwe, uzohagarika impfu zahora zibahitana muri uwo mugwi, ugabanye umuzigo ku bitaro vyahora bibakira, ariko ntibizohagarika ukwanduzanya, nkuko bivugwa nuwahoze ashinzwe igisata co gucandaga mu Bwongereza, Prof David Salisbury. 