Glossary terms with F Breadcrumb Home Glossary Glossary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z F Filarial worms Filarial worms are nematodes, which are parasites and can cause disease in humans. Flaviviruses Flaviviruses are a group of RNA viruses that includes numerous human pathogens. Many of them are transmitted by mosquitoes or ticks. FMT In fecal microbiota transplantation (FMT), processed fecal microbiota from the stool of healthy donors is transferred to patients to modulate their gut microbiome.