We don't know why ME sometimes runs in families, why you can get it after almost any infection, from enteroviruses to Epstein-Barr virus to Q fever, or why it affects women at two to three times the rate of men.
Kita tidak tahu mengapa ME kadang diwariskan, mengapa begitu gampang mendapat ME setelah menderita infeksi apa pun, dari enterovirus hingga virus Epstein-Barr sampai Q fever, atau kenapa ME menyerang perempuan 2 - 3 kali lebih banyak daripada laki-laki.