Translate the following English sentence to French:
"The truth is, at the present time, there is quite simply no adequate explanation for it, hence the debate which has been initiated on the possible existence of alternative disease transmission routes of which we are, as yet, unaware."
En effet, à l'heure actuelle, on ne sait tout simplement pas l'expliquer, d'où l'ouverture d'un débat sur l'existence possible de voies de transmission de la maladie que nous ignorerions encore.