The spore extrudes its polar tubule and infects the host cell .
The infective form of microsporidia ( E. cuniculi ) is a resistant spore which can survive for a long time in the environment .
The spore extrudes form 's polar tubule and infects the host cell .
The infective form of microsporidia ( E. cuniculi ) is a resistant spore which can survive for a long time in the environment .