Kwiyitirira imipira ihuza ubushobozi bwabo bwihariye bwo guhita yishyura inguni hagati yigiti no mu nzu. Uku kudakundana birashobora guturuka kumuvuduko wa shaft, amakosa yo gushiraho, cyangwa gukemurwa. Bitandukanye na virusi isanzwe, ubwoko bwo kwimenyekanisha butanga guhinduka cyane, kugabanya imihangayiko iganisha ku kunanirwa imburagihe mugusaba ibyifuzo.

Kwiyitirira imipira ihuza ubushobozi bwabo bwihariye bwo guhita yishyura inguni hagati yigiti no mu nzu. Uku kudakundana birashobora guturuka kumuvuduko wa shaft, amakosa yo gushiraho, cyangwa gukemurwa. Bitandukanye na virusi isanzwe, ubwoko bwo kwimenyekanisha butanga guhinduka cyane, kugabanya imihangayiko iganisha ku kunanirwa imburagihe mugusaba ibyifuzo.