Unfortunately, the existence of spirillar infection of the blood was not known at the time.
spirillar spi·ril·lar (spī-rĭl'ər)
S-shaped. Used of a bacterial cell.
spirillum spi·ril·lum (spī-rĭl'əm)
n. pl. spi·ril·la (-rĭl'ə)
A member of the genus Spirillum.
Any of various other spiral-shaped microorganisms.
A genus of large, aerobic, gram-negative bacteria having an elongated spiral form and a tuft of flagella.