abnormal susceptibility to Riboviria infection abnormal susceptibility to Orthomyxoviridae infection MPheno.ontology MP:0020945 any anomaly in the likelihood that an organism will develop ill effects from infection with one of the viruses whose genomes are composed of several (six to eight) segments of single-stranded RNA or from components of or toxins produced by a virus from this Family altered susceptibility to Orthomyxoviridae infection