[Serenity and objectivity in the face of severe childhood hepatitis: the diagnostic challenge].

The appearance of acute hepatitis of unknown aetiology in children has set off alarms in the World Health Organization and in member countries; identifying it and studying it lay out a diagnostic challenge for first-contact medical personnel and especially for pediatricians of Mexico, as well as for the coordination of care in health services. The international outlook and an analysis of the clinical manifestations are described, as well as key points for the identification and an observation of the samples that are requested for their study in Mexico.