Noun. 1. chordate-any animal of the phylum Chordata having a notochord or spinal column. animal, animate being, beast, creature, fauna, brute-a living organism characterized by voluntary movement. Chordata, phylum Chordata-comprises true vertebrates and animals having a notochord.cephalochordate-fish-like animals having a notochord rather than a true spinal column. tunicate, urochord, urochordate-primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva.hordata, phylum Chordata-comprises true vertebrates and animals having a notochord. cephalochordate-fish-like animals having a notochord rather than a true spinal column. tunicate, urochord, urochordate-primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva.
In more than half of all cases, rheumatic fever may affect the heart valves (rheumatic carditis) and interfere with normal blood flow through the heart. Even without treatment, though, only about three people out of every 10 who have a strep throat infection develop rheumatic fever.
Polio affects the body by attacking your central nervous system. It infects the spinal cord, brain and surrounding tissues.Your symptoms vary depending on which area of the spinal cord and brain it attacks. If you are affected by a lesser strain of poliovirus, you may experience minor symptoms that mirror the flu.olio affects the body by attacking your central nervous system. It infects the spinal cord, brain and surrounding tissues.